Blown tube amp. The dead valve is not necessarily visible.
Blown tube amp. Check and replace and blown fuse and try again.
Blown tube amp Luckily it happened in the last song of the gig. Tube Amp - Blown tube help ! - Page 2- Vinyl Engine Board index Hoffman Amplifiers Tube Amp Forum, PR Clone blown Tube, now blows Fuse. If I had to choose one of the 2, I would probably opt for the CTH and then replace the P20 with a full blown tube amp, because if I need to deal with output impedance issues, then I might as well go OTL. Technical Discussion. Members; I had a tech tell me once that using a small fan on a tube amp helps to prolong tube life. Thinking the tube may have been damaged from being wired incorrectly, I purchased a new tube but am getting the same sparks and Quick links Please login or register an accountlogin or register an account Usually tube arcing does not cause permanent damage to the tube, but it is possible. 3v winding of the power transformer. If a tube arcs internally, it can create a high voltage spike at the transformer center-tap that reflects into the power supply which can potentially damage a bypass cap. If your amp uses tube rectification in its power supply, a shorted rectifier tube can cause a fuse to repeatedly blow. A technician can confirm if your amp is indeed blown through thorough examination and testing. Quick links Please login or register an accountlogin or register an account Symptoms of blown tubes in a tube amp include distorted or weak sound, excessive noise, loss of volume, or complete loss of audio output. Minimal experience with tube amps --- this is actually the first tube amp I've done any real serious work on. I’ve owned one. Recently we took one of his ARC tube amps - A Dual 79 which is a 110+ pound monster of a tube amp produced in very few numbers around 1979-1980. Does this sound likely or are these symptoms of something else? Sound like a V1 problem? Examine Tubes and Fuses: A faulty tube or tubes and a blown fuse would result in a lack of sound. Guitar Wiring. My next step is to try a I recently bought a Harmony h400a tube amp. Signs you have a broken tube. If the Rectifier Tubes are OK, move on to testing the Power Tubes. Here's an explanation from Dolf Koch, owner/builder: "Our ATR series of hybrid amps the Jupiter, Startrooper and ATR4502 (see also the blog article about these amps), are designed in such a way that they react the same way Depends on which tube my friend. Still needs a full recap and a good service but sounds good. If your ammeter is slowly going through the roof, you have a bias problem. Home; Help; Search; Login; Register; Hoffman Amplifiers Tube Amplifier Forum Amplifier Central; Talk with your fellow tone freaks on the web's liveliest (and friendliest!) tone forum. in the latter case, you can run into some tubes that might last thank you both for your replies. All of a sudden I started getting thi I you have tube amps, then you need a back up pair of tubes. Joined: Wed Aug 01, 2007 8:26 pm Posts: 442 Location: Ottawa, ON, CA Hello, A couple of months ago I bought a McIntosh MC225 tube amp from Audio Classics. Great score for me , £120 for the amp, £30 on new caps and a couple of hours work. If something blows, take amp to doctor. Applied Whammy Bars 101. Guitar Schematics . But it probably is one or the other preamp tubes. Pickups. i'm using 6v6s and a 2A fuse. I jumped that connection between 1 and 8 and was able to turn the amp on without blowing a fuse, but after 10 minutes of testing one of the tubes started red plating so I shut down the amp. Sometimes shorts pop a fuse. Turns out, during the gig, something happened and the amp began smoking. Jump to Latest You don't need super close matching like in a hifi amp but you still want all 4 tubes to share the load more or less equally. 5. In some tubes it’s more intense than others, but this is not a problem. Amp fuses also vary in appearances such Blown Tube. Tube Amp Doctor (TAD) Tung Sol (Re-Issue) Amp Parts Menu Toggle. Dirty Connection. Troubleshooting a blown amp can be a daunting task, but with a systematic approach, you can identify and potentially resolve the issue. Tone Control Discussions. It is cheap and rather good sounding, but its left side got dead (left-side tubes stopped glowing) when I replaced the stock 5881 tubes with RFT EL-34 (everything was OK for 30 min. The tubes essentially perform the same function as transistors in modern solid state amps. To see if this is the case, locate the rectifier tube in the amp—it’s usually the tube closest to the mains (AC) transformer, and it’s typically a 5U4, 5Y3, 5AR4, GZ34, or 6X4. For example, regular 6V6s will make noise when If this won’t solve the problem, you should perform a diagnosis on your tube amp or just call for professional help. However, if your amp is truly in abysmal condition, it is possible that your pilot light is broken and you also have an independent no-signal problem deeper in the circuit. The Gallery. In bad practice we plugged it straight into the wall Another common problem with amplifiers is tube failure. IMO the most important test to perform with your tube tester before you plug a new (or used) tube into an amp is a full set of short tests for the tube. BTW the Aiken tech note was very helpfull in regards to finding the polarity on so called non-polarity caps. . Stock (OEM) Guitar Wiring Diagrams. (This is noted on the back of the parts list that comes with your kit. this one basically Fender Pro Junior III Red October - Thomann UK Cyberstore Well I pulled a bonehead move. Just noted that you said your amp is self biasing --FWIW I've a self biasing amp - put in a new set of tubes and one tube's plates started to glow red. But now this new fuse has blown under the same circumstances, amp on about 1/2 hour. "Great" in an amp is composed of a whole lot of things - lead routing, grounding, layout, socket metallurgy, flux composition and whether it's removed or not, humidity of the air, dust concentration and conductivity at the humidity level, shape of the Faraday cage of the chassis enclosing the wiring, tube source, tube internal materials, vacuum He was high-end before such a term existed. A faulty rectifier tube. Well I bought the amp and a new set of tubes for it. Muddy sounds of the tube amp could also come from interference or a dirty connection. The tap test. While playing my 1967 Fender Bandmaster (AB763), the 2 amp slo-blo fuse blew. If the replacement fails immediately it’s often a sign of a A blown fuse can cause the amplifier to fail to turn on or produce distorted sound. Forum-Related Info. Blown screen resistors and more. I don;t have tube HIFI gear but for my Guitar amp I have had tubes that popped and crackled from time to time. Tube amps or tube amplifiers as a whole aren’t particularly sensitive. However a shorted bypass or filter cap would probably cause a blown fuse. However, low noise levels is a minor thing, more importantly the amps sound great. On power up a bad qualitu fuse or underrated one will blow even with the secondary disconnected For example a . If you listen to your amp a lot you will hear the difference with the NOS tubes. A 5U4 rectifier tube has a higher voltage drop than a 5AR4 and will counteract to some degree your higher line voltage. Tubes are an essential component of many amps and can wear out over time. The wonderful feeling when you’ve unearthed the sweet spot and the tubes are creating magic, belting out warn tomes. I figure that with the Amazon Prime membership, I could demo the amp for 30 days; and if I do not like it, I could return it easily. As you can see in the glow in the dark photo, the left hand tube is the one in question. -User Name-Password. Amplifier Central; Talk with your fellow tone freaks on the web's liveliest (and friendliest!) tone forum. This Amp Kit is based on the legendary Fender Brownface Deluxe® Amp of the early 1960's. 5 amp I haven't played my amp for a while, so I decided to clean it up before I played it, and when I opened up the back I noticed one of the power tubes (an EL34), had what looked like brown burn marks on it, whereas the other was clean and clear. After about 10 seconds of that, i saw a big blueish spark reflection on the wall behind the amp. The most common issues you will have with a tube amp are a broken power tube or a broken preamp tube. My recommendation would be to take it along to a reputable amp repairer who will swap the tubes, check the circuit board and re Tube Amp Doctor (TAD) Tung Sol (Re-Issue) Amp Parts Menu Toggle. done this a couple of times. Skip to content. I'm going to go through all the power tube socket connections and resistors to see if anythings up, I can't see anything shorting and my meter confirms that. These tubes are specifically designed for the Valhalla 2 and will keep your amp singing with that Schiit magic. If the fuse is intact and the amplifier still doesn’t turn on, it’s time to open up the amplifier and check for any visible damage. If you’re experiencing issues with your vacuum tube guitar amplifier, you’ve come to the right place. There are many possible causes of blown amps, but only a few common symptoms. Usually tube arcing does not cause permanent damage to the tube, but it is possible. Post by titser_marco » Wed Aug 26, Yep, I took the tubes out. Hoffman Amplifiers Tube Amp Forum, PR Clone blown Tube, now blows Fuse. stoma Posts: 1 Joined: Wed Feb 08, 2012 6:52 pm Location: United States. I thought it was a pretty good idea and probably won't hurt Some things to consider: Valves are made with considerably loose tolerance these days. If one tube is wildly different it can either try to hog the power load or be a slacker and let the other 3 do all the work. It’s great with dynamic headphones, but I would not personally pair it with any planar headphone, and especially not something relatively insensitive like the HE-560. I blew a power tube in my Deluxe Reverb and it limped along but at half the power and with a blown resistor. The Woo WA6 is probably the best value amplifier Woo sells. Some failures can be an intermittent short and some can be a You'll know your tubes are blown because the amp will either have volume problems, noise, or won't work properly on one or all channels. Question is can I just replace the one tube or do I need to replace a pair or all four. Odd, I am kind of glad the tube "blew" I had never had a tube amp up till this point and was in fear of what a tube would do when it did blow. In this episode of Sonic Sciences, we unravel the scie I’ve gotten a couple of emails from readers who’ve experienced blown output transformers while using the Tube Amp Expander. I turned Steps To Troubleshoot A Blown Amp. My questions are: As you can see in the glow in the dark photo, the left hand tube is the one in question. But if it occurs frequently, it should be a cause for worry. Changed it out thinking it might just be the tube, the next tube also glowed red. Remove all fuses for replacement. Members; So last night my amp was making a scratchy sound when I would push it, so I naturally went to google to see what the problem could be. Depends on which tube my friend. NOS Vintage Mustard Caps; JJ Electrolytic Capacitors; Valve Tube Sockets; Valve Retainers and shields ”Amp Talk” About Us; Login/Register; A tube amp builder's community. Welcome To the Hoffman Amplifiers Forum December 23, 2024, 05:06:21 pm: Welcome, Guest. My Yamaha T100C combo has a huge fan on the bottom that blows cool air up to keep the tubes cool. Blown Tube. My first tube amp. Perhaps a step in the right direction, and leave the full-blown tube amp for next time? Without fail one of my amps will blow a "tube" fuse after approximately 45 minutes of listening. Replace all the screen resistors. A tube like this should be replaced. The difference between replacing the blown KT88 and replacing the set is >$100, and this is not an amp I EAch of the 4 channels goes down. Collapse Sometimes, an amplifier blows up fuses when there is an issue with the speaker. If you have not been trained to work with high voltage then have an amp technician service your amp. There are See more The two main symptoms of a power tube problem are a blown fuse or a tube that begins to glow cherry red. I have a blown KT88 on a set that does not have significant wear on them say a conservative 75% of life considering the play time involved. 20 watt power. -User Name After 30+ years of using tube amps this is the first time that I have ever had a working amp suddenly stop working on me. And believe Ive blown a tube and now I have a big red brick. This is very neccessary part on tube power amplifiers as tubes do wear out This is sometimes due to wrong biasing of the amp, which really isn’t a tube problem. The bias voltage doesn;t fade away for example. Marshall Discussion. The Phostenix Pages. Put the rectifier back in. In an otherwise functional amp, the main fuse can and will If the fuse blows, take the amp to the doctor. The amp sat for 20 years without being plugged in or powered-up. My amp starts making this sound after playing for prob 1/2 hour plus. I quickly hit the standby. ) You should use instead a 5U4 rectifier tube in your amp. It’s a mountain of a dream and a mile-high climb to the top. They typically want to know if I’m aware of this problem, if I have experienced it, if I know what is causing it, and what they can do about it. On a tube amp with a tube rectifier, it’ll give an indication of current draw relating to the bias/voltage relationship. I used two different sets of tubes (including the pair in at the time of failure) and both sounded great, however I didn't try them one at a time. The broken strings, the blown tube amp, hauling 40 pounds of gear to and from rehearsals with no car. But there are times when a properly biased amp has a tube that begins to red-plate. I've determined that the high voltage secondary winding in the power transformer is partially shorted (I presume it overheated and melted some insulation - it does have a bit of that nasty burnt wire smell) causing excessive current draw and a blown fuse. 1). It pays to check the bias too. The LED on the front starts flashing red/green - according to the manual, most likely indicating a power tube problem. Here’s what to watch for. Sleepers. Never had any trouble with anything. 14 posts • Page 1 of 1. In most cases a blown fuse is signaling a shorted or otherwise failed power or rectifier tube. A tube amp is a type of amplifier that uses vacuum tubes or valves to amplify the signals created by your electric guitar. When I switch the standby to on it blows the fuse. Typically, if your amp uses both powertubes at the same time, which, some Hey guys, My Ampeg B-18N ('67) refused to make any of its sweet noise for me at a gig Saturday night, and the one thing that was immediately obvious about the amp was my 5AR4 recto tube was not lighting up. A few days ago, my friend asked if he could use it for band practice, so I let him. Yes. A couple weeks ago, I decided to try the YAQIN MC-13S which I could order easily on Amazon. A tube amp, short for “vacuum tube amplifier,” is an electronic amplifier. In general, I suggest sticking with the amp as is and concentrating on finding and fixing the problem, not doing the stuff on this list. I don't need to build a tube amp, I don't need to have a tube amp, I am doing it simply because I want to. Amp was on for a while and I turned it off then back on too quickly. I've got a blown power tube in my SVT CL. I marked all my caps in Dropped a new cap in and checked on my limiter, all good, tubes in, checke again, limiter out switch on, the Rivera ;ives again. Common Tube Amplifier Problems. Some amps have adjustments for biasing and some rely on tube matching to the amplifier. k. Amp is a Rogue Audio Atlas (not a Cronus as that is just the top plate to accommodate the bigger, non standard tubes. After a few hours playing, the IGBT chip blew (shorted). If you detect interference noises in your own amp which could be related The fact is that tubes normally generate a lot of heat which means they are working fine. The tubes are old and have been used a lot. Some of these holders are glass-tube type, while others are blade-tube type. A blown amplifier can exhibit a variety of symptoms, including no sound or distorted sound coming from the speakers, a burning smell, or smoke emanating from the amplifier. I've also purposely blown up some e-lytic caps and other things having fun err giving them a stress test?! Tapping the tubes is to check for microphonics. In most cases a blown fuse is signaling a shorted or otherwise failed power or rectifier Post subject: Tube Amp Blown Fuse - Possible Causes. Most of the time, these amplifiers blow for no reason. If this is your first visit, be sure to check out the FAQ by clicking the link above. Here are some steps to help you troubleshoot a blown amp: 1. I was playing, things sounded fine until there was Even if you test the tube going bad you still have to check the rest of routine I mentioned above since the blown tube is only a result of malfunctioned electronics. e. I was playing my Marshall "Demanufacture" 2203 based clone tonight jacking with a new noise reduction pedal I got. And what it took And while it may not contain *all* the mojo of a full blown tube amp, it does have a certain something not felt in any other ss amp I've tried. A power tube stopped working today while I was playing. Is this a blown tube? All tubes are glowing Take the old power tubes out, you most likely have a bad one. High-end and expensive tube amps, in particular, can withstand a lot of stress that comes from lugging them around for gigs. General discussion area for tube amps. It's important to note that Mesa amps are designed in such a way that even the most I'm no amp expert but I recently blew a fuse in my Fender Blues Deville. Repeat this test with the other Rectifier Tube(s). Welcome To the Hoffman Amplifiers Forum January 13, 2025, 01:20:25 am: Welcome, Guest. hey guysjust got tube power amp (mesa 50/50)when in standby there is no problems. Reference Articles. It’s often attributed to the discharge of residual electrical energy and is generally not a cause for concern. I need to figure out what causes the failure before buying a replacement part. Tonight I had been listening for a couple of hours when I suddenly heard a loud crackle and then Hoffman Amplifiers Tube Amp Forum, Blown tube? Welcome To the Hoffman Amplifiers Forum January 11, 2025, 01:23:24 pm: Welcome, Guest. Any thoughts or input? I figure even with a small fan, the tubes are still gonna get cookin'. I played for about Help ~ blown tube? HRD. At a gig last week I had set up and warmed up the amp. Step 4: Determine the type of Turns out, during the gig, something happened and the amp began smoking. Suggestion Box. Check the power source: Ensure that the amp is connected to a reliable power source. If you don't use a light bulb limiter then a blown fuse, smoke or arcing will let you know there is a problem If your tube (or solid state) amplifier is not “turning on,” the cause of this problem could be a blown line fuse. I removed the two power tubes (6L6's), to eliminate them as a possible cause, and put in another 2 amp slo-blo, which also blew immediately upon turning on the power. Tubes are slightly more To begin with, it would make sense to identify the visible signs of bad tubes before booking your amp with an amp tech to uncover any deeper problems. I assume its blown, but my tube knowledge being pretty limited, will that be something If your tube (or solid state) amplifier is not “turning on,” the cause of this problem could be a blown line fuse. Q: How do you know if your tube amp has a blown tube? Don't dick around with a red-plating tube. Our expert team specializes in diagnosing and repairing broken vacuum tube amplifiers, ensuring that you can return to enjoying the rich, warm tones that only these classic devices can provide. There's never a good time for your beloved tube amp to not work but a blown fuse is actually a good thing if you are aware of what it's trying to tell you. Not only are all the amp models I The amp has now been flawless to the point of boring. Not much about my speakers, but the few articles there are, mention tubes. He thinks it's a tube that blew, but I wasn't there and won't be able to get the amp until later. Last Updated on September 20, 2023 by Perry Garner Woo WA6. Hoffman Amplifiers Tube Amp Forum, Power tubes and failure symptoms. But it's a learning process. And see if the amp keeps a fuse that way. Quick links. Either way, this can dramatically affect tube life. Check the Filaments Glow! Luckily it’s very easy to visibly identify what a bad In the event your amplifier will not power on, it is almost certainly due to a blown fuse. Lutherie and Repair. Now that it is out of the way I have replaced all the tubes with NOS. But yeah, generally speaking having blown power tubes and rectifier tubes, they'll be visibly discolored and they'll take out a fuse on their way. Is the burnt looking one blown or is it meant to look With a big amp this can mean blown speakers. Moderators: pompeiisneaks, Tube Amp Doctor GmbH In Stock Amp-Kits. Remove the fuse and replace it. It’s difficult to tell when tubes are genuinely ‘overheating’ because all amp and tube combinations are different and run optimally at various Hoffman Amplifiers Tube Amp Forum, Amp blowing fuses even with rectifier and power tubes removed What type of fuse are blown ? Double check the rating. Oh yeah, I’m definitely aware of it. Seeking troubleshooting tips on my Marshall JTM30 . “Lightning” (arcing) or amp shutdown (blown fuse) at this stage indicates a bad Rectifier Tube. RUn the amp with no power tubes and see if the voltages around the empty sockets look reasonable. We’ll start with visible signs. Immediately prior to the fuse blowing, two of the tubes (positions 3&4) become very bright. Most valve amps with EL34s or 6L6s must be re-biased when (see bias page) you change the Q. I changed to a new pair about 3 months ago biasing them at between 25-30mA each. I need competent advice: I purchased a new amplifier (Dared MP-60, made in China). Fantastic amp. Let’s start at the beginning. In the end Help diagnosing problem with Fender Super Champ X2. I replaced the fuse, powered up, saw some sparks in the rectifier tube, then blown fuse. Most guitarists love tube amps due to the harmonic structures and sound of the overdriven amp. If it doesn't blow, got to the next step. Returned the amp to the manufacturer and a minor adjustment to the bias circuit solved the problem. I know from experience that these babies are built to last. Please login or register. It WILL take other components with it if you're too curious like me. To check for a dirty connection, you should examine connections on the tube amp that include the tube sockets. I should have. If you For replacement tubes, you'll want to go with the 6N1P and 6N6P NOS Matched Pairs. The last thing wanted is a blown tube amp or speaker! The line 6 from what I remember sounded really good for some amp models but some of the evh/6505 amps sounded like ass and unusable due to the high end It also had a electronic feel to it and the way the pick attack reacted didn’t feel like a tube amp The FM9 sounded and reacted like a actual tube amp 100%. The next day I opened up the amp expecting to find something obviously burnt inside, but all I found was a bad fuse. After this happened a few times, I switched Tube #4 in one amp with Tube #4 in the other amp with similar results in that amp. Whichever one is bad, throw it away, Y ou now hav all new tubes in your preamp section. I've seen failed output tubes blowing I built a simple single ended tube amp kit based on EL34. Remember Plugging a 100-watt flamethrower into a single Greenback might blow the speaker on the first chord, so size and wattage matters. To correct this, physically open up and inspect the speaker. In a tube amp, on the secondary 6. Always make sure the correct connections are made as far as the ohm in/outs as well. I've read threads on it on a few Depends on which tube my friend. If the fuse blows, you've probably got a stuffed rectifier. No sound . So check the tubes for any signs of damage or wear and see if any fuses need replacing too. Home; Help; Search; Login; Register; Hoffman Amplifiers Tube Amplifier Forum Blown amp symptoms can include: the protect mode light turning on or not turning on at all, a blown fuse, distorted sound, a power loss, the smell of burning, or even overheating. I got the amp off ebay and they said the hum is due to a blown tube. The Power Amp section is fat and loud with nothing but punch, designed to emulate the sound of a full blown tube power amp using 5881′s. I've checked with new fuses and still it blows them instantly. This article will discuss how easy it is and the steps to follow when fixing a blown amp fuse. Sometimes they pop a resistor. Seems to go away when amp is powered off and back on, but then comes back after a bit. For a more in depth look at If your line voltage is 125 volts then that is too high to use a 5AR4 rectifier tube. The most likely reason is a dead power valve – a 6L6, EL34, EL84 or 6V6. Ampkit Style Tweed Style Ampkit Power 20 Watt Products per page. Whichever type, a blown fuse should have a black spot on it. Check the power cords, fuses A tube amp builder's community. I made sure to keep the cabinet cable in the 4 ohm output so he would know which one to The classic indication of a broken amp is a dark pilot light. Step 3: Find the Blown Fuse. If any of those other tubes use pin 1, you've got to accommodate that. The fuse does not blow. This is a very smooth, warm, punchy drive made to really shine with singing leads. Modelled after the original! I'm fairly new to tube amps and understanding them. This was almost always the 12AX7 preamp tubes. Common tube amp problems. To diagnose tube failure, start by visually inspecting the tubes for any signs of damage or wear. The amp suddenly went quiet and I noticed one of the power tubes was dark and it seemed to be hotter than the other 3 tubes. Most valve amps with EL34s or 6L6s must The amp has now been flawless to the point of boring. A question for people knowledgeable about tube amps: What would be the symptoms of a blown transformer? Would there be power in the amp at least, with the power switch being lit up if the transformer was blown? If it's blown it completely dead, and if it's shorted the amp will distort very quickly when turning up the volume, in a non How's your bias department? Any sort of failure in bias would send your amp into the kind of failure you're experiencing. xfmr winding must be probably checked last but completely agree with plate resistor and coupling cap. My recommendation would be to take it along to a reputable amp repairer who will swap the tubes, check the circuit board and re What is a Tube Amp. I have settled with 2 kt88 master tubes for about 6 months now. 2. Fortunately, fixing a blown amplifier fuse is not a difficult task. After that, replace the blown tube with a new, properly matched tube for restoring optimal performance. Guitars. The line fuse, also referred to as a mains fuse, is the fuse that stands between the main AC power and your power transformer. after about 15 minutes the hum is loud enough to tell something isn't right so i turn it off before something bad happens. WARNING: A tube amplifier chassis contains lethal high voltage even when unplugged--sometimes over 700 volts AC and 500 volts DC. With it, acclaimed tube-amp designer and manufacturer Andy Fuchs has addressed many contemporary The Tim Pierce Signature OD/Boost was designed to emulate one of Tim’s favorite amps, the Naylor SD60. Power down, replace the fuse, put in your spare rectifier. So I would like to know, in extreme detail, what happens inside a tube amp when you hit it with a signal and no load is connected Depends on which tube my friend. Sometimes fuses themselves fail or there was a Stevem wrote: ↑ Mon Jul 08, 2019 11:39 am I would remove the output tubes and see if a 1 amp fast blow type fuse holds, as it should do fine since your on 220 vac, if not you have something wired wrong before the first filter section in all likelihood, or a bad diode. it's a weber kit. Every blown fuse must be removed to be replaced later on. My recommendation would be to take it along to a reputable amp repairer who will swap the tubes, check the circuit board and re-bias the amp. If your amp blows a fuse, it’s almost always for a reason, so make sure you get somebody to investigate. When in standby, one of the tubes doesn't glow at all. Moderators: pompeiisneaks, Colossal. The Hotrod Deluxe is a push-pull amp. Always verify that the total speaker wattage can handle the output of the amp. The tube might still be working o. Sometimes shorts blow out a regulator. A: When turning off a tube amp, you may hear crackling due to the sudden cessation of power and the cooling of components. FAQ; Board index. In an otherwise functional amp, the main fuse can and will I have a blown KT88 on a set that does not have significant wear on them say a conservative 75% of life considering the play time involved. These are the most important and most fragile components of the amp, so they will need to be replaced when damaged. A bad output tube could do it too but I wouldn't go sacrificing new ones until 100% sure about the bias supply and its distro network. It is normal in the automotive industry to have amp fuses blown. I have a THD flexi-50 which has inter-changable tubes. Amp fuses also vary in appearances such as a black type clip or a glass tube type. ) that has been modded by Dallas Clarke. The PSU contains a capacitance multiplier circuit. There are a couple very obvious things to look for. From what I read it could be a loose tube, so I realized that the far left tube (which I now know is the rectifier tube) was a little loose so per google I took it out and made sure it was back in snuggly, I flipped it on and let it warm up and when I took it About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright The amp has now been flawless to the point of boring. To make an Amps Forum in-joke, Murder/Suicide. Enter Fuchs Audio Technology’s ODH Hybrid Tube/Solid-State Amp, a new take on the tube/solid-state hybrid amp. I have a '93 2-channel Dual Rec (sn#1313) that I completely retubed with 12ax7's, el34's, and 5u4gb's less than a year ago. If you were to just remove a tube it wouldn't stop the amp from working, although if one does that because they notice a tube is ready to go they should remove two, from opposite ends of the amp, to maintain balance. Guitar amp tubes giving you trouble? Nothing can beat the true analog sound of an authentic cranked tube amp. I also didn't allow the amp to worm up properly, I began playing less than a minute after turning it on. Can someone help to identify the issue or suggest I looked down on amps - to my sock and disbelief the left tube amp was in smoke!!! Here is what I saw: the beautiful 300b princess mesh tube was clearly blown, purple flickering light almost looked like it was about to go on fire and there was smoke coming out of the amp from around the base of rectifier tube, and near the hum control. All are welcome, from seasoned pros to absolute beginners. so, maybe a silly and moron question,sorry about that,but, how do i check a tube for a short? Blown amp symptoms can include: the protect mode light turning on or not turning on at all, a blown fuse, distorted sound, a power loss, the smell of burning, or even overheating. Preamp tubes yes, but never a power tube. Marshall Amp Discussion. So, my questions are: can a blown tube cause the smoke, and, if not a tube, what could it be? I'm sure there are a plethora of causes, but any information would be appreciated. You may have to register before you can post: click the register link above to proceed. If it's blown, which I assume it is, would this cause the After about 10 seconds of that, i saw a big blueish spark reflection on the wall behind the amp. A amp that could run on 120 vac with its normal 2 amp slow blow fuse should be just fine with a 1. Honing Your Axe. Financing from the sell of my current amp, my budget will only stretch to €500. BUT Yesterday, I stumbled upon a Luxman LV 105. sound like crap. Most blown tube amp fuses are due to failed power tubes. The problem could be - and often is - an internal short between electrodes that simply kills the valve and makes the fuse blow without any other external sign. Take a look at a gut shot of any Two Rock amp and you'll that the mark all signal caps as well. If it doesn't, power down. Power tubes are the larger of the two types of tubes in an amp. Broken tube amp? We fix those. In either case, the blown fuse will have a black spot in it or will be completely dark. Harmonious Notes. But while tube amps don’t break easily, it still happens. If you advance from 0 volts and the ammeter pegs itself, you have a shorted tranny, capacitor or power tube. Step 4: Determine the Type of Fuse to Replace It with. They are there in case you blow a tube to protect the rest of your amp from damage. 4 blown tubes without blowing fuses - Marshall jcm 900 4102 . The other By OK, I mean pin 1 is sometimes used as a tie point for components. If the amp remains lit, that Rectifier Tube is OK. take one tube out of the preamp section and replace it with your new tube, listen, if no improvement, it is probably not your tubes. 3 A instead of a 3 A. In some cases, the amplifier may produce a loud humming or buzzing noise, or the lights on the amplifier may be dim or flickering. What matters is that it is glowing to some degree. Symptoms of tube failure include a loss of volume or tone quality, as well as crackling or popping sounds. IMO, there is Option C: fix the amp without modifying it. If you power up your amp and it seems okay, but there is no sound, most likely the problem is either with the speakers or (more commonly) with the preamp tube sockets. The other tube failure I've seen is one losing vacuum, and oxygen gets into the tube, it turns white inside. 4 blown tubes I'm an engineer and I am building a tube amp. I can't clearly see the pre-amp tubes but my feeling is the power tubes are fine and it's my preamp tubes. The dead valve is not necessarily visible. This is a sign that that specific tube is failing and in a “run-away” state were the current can’t be controlled by the bias voltage. Is there perhaps something specific to zero in on to determine the cause? If only one tube is glowing, and the other isen't, that is a sign that the tube that is not glowing is prolly blown out. (Side note: It’s If your valve amp blowing fuses, there are a number of possible causes. First, every tube will have a heater filament that, when working, will cast a nice warm orange glow. A secondhand chinese amp is about all I can expect. I unplugged the amp and finished with my back-up amp. A question for people knowledgeable about tube amps: What would be the symptoms of a blown transformer? If it's blown it completely dead, and if it's shorted the amp will distort very quickly when turning up the volume, in a non-musical way i. Always change push-pull valves in sets - the valves are matched to work as efficiently as possible and failing to do this will result in ugly sounds and probably more blown valves. However this shouldn't be a worry with your Mac for many years because it does have muting circuitry. I took the metal screen off the back to I fixed the wiring, powered up the amp, and it worked but after about 2 hours of running the amp died and I found a blown fuse. Pretty impressive for a tube amp. ive got a new build supro with a pair of 6973 tubes. 4. After blowing I have sound on only one channel but all the tubes seem to have the normal glow (lighting). NOS Vintage Mustard Caps; JJ Electrolytic Capacitors; Valve Tube Sockets; Valve Retainers and shields When your amp has blown a fuse, my rule is to replace it with a fuse of the same rating and see if the amp comes back to life. At about the same time,the light in the bar flickered strangly and the bar owner ran to the the back of the bar and play with the bar's electrical circuit(the Re: Tube Amp - Blown tube help ! Post by fastdave » 11 Apr 2016 15:19 I have an Ariand which blew a diode in the power supply - the cause was a heater to cathode short - got away with new matched pair and new diode. Power up. right fuse and stuff. Tube shorting is obviously the most common way that tubes can damage an amp. Each of the power tubes seem fine and they all glow equally and a sharp orange color. The difference between replacing the blown KT88 and replacing the set is >$100, and this is not an amp I I have a blues junior. Ideally it needs a rectifier upgrade out of the box too, so is going to be closer to $850 by the time you’re done Blown Amp Symptoms. « Replacing an amplifier tube In order to identify the defective or “broken” amplifier valve, there’s one simple, reliable way – the so-called tap test. Design Modules. i've checked the wiring for incontinuity and it seems fine. The most common cause of blown fuses is a blown power valve. Least likely but possible, a bad signal coupling cap feeding output tube control grids. amp works fine, but after a few minutes of being "on" a hum slowly starts creeping up and gets louder the longer its on. but might act as a microphone so don't think this is your problem. No results were found for the filter! TAD Amp-Kit Brownface 20, 6G3 Style Amp-Kit Amp Kit Brownface 20, 6G3 Style with ca. As it happened the volume of my amp fizzled quickly to no sound. I've had one fail this way when I yanked too hard to pull it. But I believe in building things as bulletproof as possible. Testing Power Tubes (6L6, EL34, 6BQ5, EL84, 6V6, KT88): Blown away by YAQIN MC-13S - tube amplifier. Shop Talk. i've also checked with the tubes pulled off,still the same. Not likely, but definitely possible. I guess I am lucky in the fact that as long as I have been playing, I have never had a power tube die. Either are typically indicative of a power tube failure. My only other amp job was a recap for my Twin Reverb. I you have tube amps, then you need a back up pair of tubes. You will need to identify the faulty tubes by visually inspecting them or by using a tube tester. i thought maybe it was the 250ohm cathode bias resistor on the A blown tube can take out other components and cause a blown fuse. Turned my amp on yesterday, flipped off standby and I get a nasty loud pop. How do I know if my guitar amp is blown? Answer: Signs of a blown guitar amp may include distorted sound, no sound output, or visible damage to components like tubes or capacitors. It runs off of 3 tubes. 6. It amplifies the signal from an electric guitar and uses the vacuum tubes, or valves as they’re often Depends on which tube my friend. Posted: Thu Feb 17, 2011 2:39 am . You can find them on our website or check out other tube providers like Tube Depot or TheTubeStore if you're looking for a different option. Pickup Testing and Amplifiers are the engines of your tone, but push them too far, and they can fail in spectacular ways. but next morning, when I was switching it on, the problem appeared), though it was permitted by The daily drudgery of practicing, the logistics of finding a group and rehearsing, the pain of finding gigs and actually getting people to show up and give a shit. (~80% of the time they are not dramatic), it occurs either in the output stage of a tube power-amp or inside of a tube-regulated or rectified power supply. A couple of weeks ago, a 50W non-HRM build of mine packed it in after 2 1/2 years of reliable service. They basically remove their set of tubes from the circuit so that you can get through your gig or whatever until hello guys i was just setting here listening to some deep purple, and the sound just faded and then stopped looked over the equipment and noticed all the tubes on the amp had went out, everything else is hooked into the same strip and all stayed on so its not the outlet any ideas???????? Joe A faulty rectifier tube. Check and replace and blown fuse and try again. Some amplifiers use glass tube-type fuse holders while others use blade-type fuse clips. cbjvakmivaqqvffbvzwvtxyhkzvssprzzljijqkktmtmwfoyafwc