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Post by morbe on Feb 6, 2012 8:33:57 GMT -5
One more thing tubes! I noticed that this amp doesnt have the 7025 tubes as required by fender however these were the low noise tubes. Nos models of these go for about 200 bucks a tube! Is there a modern low noise replacement? 3- 7025 tubes that would be more than the amps worth! Lol there has to be a more suitable replacement.
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Post by thetragichero on Feb 6, 2012 9:01:04 GMT -5
yup: any halfway decent 12ax7
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Post by reTrEaD on Feb 6, 2012 10:08:25 GMT -5
Im not as worried the amp has an issue since a true humbucker guitar will not replicate the noise. That was true even before you took the amp apart. I plan to replace the pot with a 1meg pot. Since the original is 999k pot. Why? That's within 0.1% of the specified value. You'll have to audition dozens (or maybe even hundreds) of pots to get closer than that. Hypothetical:You've spent hundreds of dollars on an amp. Hundreds more on repairs. Many hours on cleaning it up and making it look presentable. Along comes a guy who tells you he knows little about electronics and less about troubleshooting, but he can solder. He offers to rummage around in your amp, for free. But if he makes an error that destroys your amp, that's your problem not his. Would you allow him to proceed?
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Post by morbe on Feb 6, 2012 10:55:19 GMT -5
I guess i.dont get you comment on the pot, are you saying i should look for a 999k pot?
No i would not let a stranger rummage through my amp, its my amp my problem. I really want to learn how to work on this amp and i learn best wih hands on. I'm mearley replacing parts not rewiring or completing complicated tasks Right? I feel comfortable doing simple tasks like such. Im a smart guy i can figure things out. First computer i built was with a working knowledge of computers and now i do it for a.living. its because ive spent hundreds on this amp that i decided to do the work myself. But yes i know that i come in here all day and ask questions and get great technical feedback, and i appretiate all of it, because post by post, webpage by web page i learn a little more. Every one has to start some where. Thanks again.
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Post by reTrEaD on Feb 6, 2012 13:00:32 GMT -5
I guess i.dont get you comment on the pot, are you saying i should look for a 999k pot? No, I'm saying that the pot being 999k isn't a reason for replacing the pot. Unless I misread, you successfully cleaned the scratchy pot. Why are you replacing it? No i would not let a stranger rummage through my amp, its my amp my problem. That's the reason? Not because of the high risk of damage and the low probability of getting the problem fixed? Your amp might be in need of a few repairs, but I'd suggest you work on your decision making process instead. I really want to learn how to work on this amp and i learn best wih hands on. I'm mearley replacing parts not rewiring or completing complicated tasks Right? You won't learn much, if anything, by the easter egg approach. If you want to do something like this with a pedal, you have little to risk. And pedals run on 9v batteries. You can't kill yourself and even if you completely destroy the pedal in the process, you haven't lost much. Save yourself a ton of headaches and heartaches. Stay out of the guts of a tube amp until you know what you're doing. This is the absolute wrong place to "learn". its because ive spent hundreds on this amp that i decided to do the work myself. All the more reason to NOT work on it yourself. You have a lot invested. You have a lot (of money) at risk, in addition to your own life. Every one has to start some where. True. Start by reading, studying, and working in an environment that doesn't include voltages that can literally KILL you. And with things that won't break your heart if/when you destroy them. I'm not naive enough to imagine I have more than the most remote chance of discouraging you. It didn't work before you bought this amp. I expect about the same results now. But I'd be remiss if I hadn't tried.
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Post by morbe on Feb 6, 2012 14:32:01 GMT -5
No, I'm saying that the pot being 999k isn't a reason for replacing the pot. Unless I misread, you successfully cleaned the scratchy pot. Why are you replacing it? I was going to replace it just in case it was a reason that the amp started to buzz with single coil pickups. but I doubt it. That's the reason? Not because of the high risk of damage and the low probability of getting the problem fixed? Your amp might be in need of a few repairs, but I'd suggest you work on your decision making process instead. That came out wrong LOL, now I feel like a tool. what I meant was that I would rather potentially screw it up my self so I wouldn't have to hassle with another person's mistake, When I do something I know exactly what I did so if I had to take back to the shop I can explain in full detail what I did. You won't learn much, if anything, by the easter egg approach. If you want to do something like this with a pedal, you have little to risk. And pedals run on 9v batteries. You can't kill yourself and even if you completely destroy the pedal in the process, you haven't lost much. Wasn't going to trouble shoot the amp's vibrato issue. I just read and was told that most "not working issues" can be caused by dead or faulty caps. and since the Cap for the vibrato was not changed I thought I would swap it out. I figure, get the same value match the type (axial) for the same value (50v5mf) though I had to purchase-50v4.7mf with 20% tolerance. Place it in the exact way it came out with the Positive end pointing to the rear of the amp. (replacing it exactly how it came out.) And if that didn't fix the vibrato oh well, its not like I have to have it, I just would like to have it. as far as the volume pot I've done a few of those and i know that's not an issue for me. Save yourself a ton of headaches and heartaches. Stay out of the guts of a tube amp until you know what you're doing. This is the absolute wrong place to "learn". All the more reason to NOT work on it yourself. You have a lot invested. You have a lot (of money) at risk, in addition to your own life. Every one has to start some where. True. Start by reading, studying, and working in an environment that doesn't include voltages that can literally KILL you. And with things that won't break your heart if/when you destroy them. I'm not naive enough to imagine I have more than the most remote chance of discouraging you. It didn't work before you bought this amp. I expect about the same results now. But I'd be remiss if I hadn't tried. Well, well said I don't plan to learn on this amp I was just trying to do simple component replacements. But sure I will stick to guitar pedals. So now I have to try and clean up this strat is there a good web site with step by steps to shield it. Since I didn't get any ground type hum with a humbucker equipped guitar. Just that it was funny that I still got the hum in all 5 tone selector positions. Thanks for the reality check Retread.
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Post by morbe on Feb 6, 2012 14:33:54 GMT -5
It was also raining out side and we've had a few days of thunder storms. I wonder if weather effects the electronics of strats?
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Post by newey on Feb 6, 2012 22:25:51 GMT -5
Yes, The Original Guitar Nuts site . . .. The site has been hacked, and never corrected by John Atchley. The hacking was why this Board was started by RandomHero back in April of 2005. The original shielding instructions can still be accessed, use the browser's back button to navigate around the re-directed pages. Also note ChrisK's updated advice regarding the "Blocking Cap"reTrEaD sez: Amen, +1. Can I get a Witness? "Start by reading, studying, and working in an environment that doesn't include voltages that can literally KILL you. And with things that won't break your heart if/when you destroy them."
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Post by ijustwannastrat on Feb 7, 2012 8:49:17 GMT -5
"Start by reading, studying, and working in an environment that doesn't include voltages that can literally KILL you. And with things that won't break your heart if/when you destroy them."
I hate to say it, because I know nothing except for this, but....
it's actually the amperage that kills you.
Still, this amplifier was the potential to kill. Just an electrician ex-electrician ex-electrician in training being proud of his one fact he knows....
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Post by reTrEaD on Feb 7, 2012 9:36:52 GMT -5
it's actually the amperage that kills you. Absolutely true. But the human body has a moderately high resistance. So it requires a fairly high voltage to get enough current to flow in the right part of the body (across the heart). Still, this amplifier was the potential to kill. 500 volts of potential with a low internal source resistance and enough charge storage to maintain the necessary current for a sufficient time.
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Post by morbe on Feb 7, 2012 10:05:55 GMT -5
Wow i hope the 4 watt amp kit i plan to build from radio does carry potential votage to kill me. Lol.
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Post by morbe on Jul 2, 2012 16:08:37 GMT -5
I know this is a bit of an old thread I don't mean to bump it. But I found that the noise was coming from my guitar. I just need to shield the guitar. Every light in my house are those little twisted energy efficient bulbs, the amp is great though.
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Post by morbe on Jul 17, 2012 23:40:35 GMT -5
Finally got some sound clips here of the amp, Not much just a condenser mic right up on the grill cloth. Disclaimer: I am not a sound engineer, nor a pro musician so the quality of the clips may be sub par. You are not suffering from Ear Fatuige the first clip is as follows: Fender Super Reverb, Tone Knobs on 7,7,7. master volume is maxed and channel volume is 3. I am playing through a 1993 Fender Standard MIM with upgraded "Vintage Noiseless Pickups". same riff is played, position 1, 2, 3, 4, 5, then turn the bright swith on and run through poistions 1-5 again. Then remove bright and mucho reverb and run through the positions 1-5 again. soundclick.com/share.cfm?id=11774015Then next clip is just me playing around, Settings ? I forgot. Sort of funky but not quite. soundclick.com/share.cfm?id=11774016
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Post by andy on Jul 18, 2012 7:47:40 GMT -5
Sounds great, morbe. In a world where tinnitus and lumbago didn't exist, my ideal amp would most likely be a Super Reverb. Oh and money- if tinnitus, lumbago and money didn't exist!
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Post by morbe on Jul 18, 2012 8:06:30 GMT -5
You know I have a pair of musician ear plugs, my wife loves them but they don't work for me. I already have tinnitus and hearing loss from when I spent some time in the Marine Corps grunts. +1 on the back pain. I took it to jam once. It records well I think. I'm right under a novice in terms if recording. Still learning how to master and things like that. I'm using audacity on linux ubuntu.
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Post by morbe on Feb 9, 2015 23:22:28 GMT -5
I was just revisiting things. No need to bump an old thread, but in retrospect. That 81 Super Reverb has been a good amp. Ive purchased and sold many amps and guitars over the years but the 81 Super Reverb has been in my arsenal for all this time. Its got tons of headroom, she a bit stubborn when it comes to matching non-fender guitars but with my '90's Standard Strat and Classic Series '72 Telecaster They pair up very nicely. It doesn't get the most playing time due to the obvious size of it but when I get a "wild hair" I dust it off and stretch the legs out a bit. Guess I got lucky with this one,.
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