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SqurlyMurly
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7/24/2009 3:05:45 AM
"64" Fender Super Reverb
any techs out there?
whenever i hit the b-note on my low e string, there is much crackling and popping. seems fine everywhere else.
any idea what could be doing this and how i might fix it? i really don't want to send it out and can't afford to anyway!
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LyinDan
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7/24/2009 4:43:31 AM
A real blackface 64 amp? Or a reissue 65?
If it's a real blackface, you prolly have a tube issue, and it's prolly one of the 6L6 power tubes (big ones). They can get selectively microphonic like that. Try tapping on them with the plastic handle of a screwdriver or something. If one rattles like hell, it's prolly it. Could be a 12Ax7 (small tube), too.
If it's a reissue, could be a solder joint.
Something is harmonically tuned to that low B, makes it wiggle enough to crackle.
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never never band
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7/24/2009 5:47:34 AM
a real 64 super reverb?
sounds like it's time to sell it..
I give ya $50 for it
:-)
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TNT
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7/24/2009 9:17:57 AM
Yep I agree with LyinDan.
Your low B is causing something to vibrate / resonate and its affecting either a tube or could even be a dodgy joint somewhere else, (but the tubes would be the first place to look.
A NOTE OF CAUTION!
Unless your very comfortable around electronics, I wouldn't go poking ANYTHING with ANYTHING with it powered up, and doing it UNPOWERED won't tell you a lot!
(It's hard playing guitar when your fingers have been fried by electricity)!!!
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Andy Broad
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7/24/2009 11:46:40 AM
---- Updated 7/24/2009 11:58:53 AM
I had a similar problem with my musicman amp. It turned out to be a loose capacitor. First thing to check is the valves though as those above have said. Just wiggle them in thier sockets, (WHILST TURNED OFF and COOLED DOWN!)
I tested my amp by opening up and tapping all the various components with a wooden chop stick till I found the one that caused the inititant fault. The amp needs to on whilst doing that so don't do it if you aren't comfortable with electronics (I used to be a design engineer so have agood Idea of what's safe and whats not). There are some very high voltages in a valve amp so be very careful if you open it up. Get someone else to do it....
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Andy Broad
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7/24/2009 11:48:53 AM
@Lyin Dan
I'm intrigued as to why you think a reissue is more likely to have a solder joint problem than an original....
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LyinDan
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7/24/2009 4:16:54 PM
Andy, because the reissues use pc boards, and the original was hand-wired (more reliable connections (although not 100%). PC board soldering is done by machine, mostly. Stick a board over hot solder and run of wave over it.
I are a tech, btw, I fix these thangs.
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LyinDan
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7/24/2009 4:22:17 PM
BTW, as has been said, use caution. Don't open the thing up if you don't know what you're doing. There's about 450 volts running around in there. Could kill you. :)
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Texas Willie
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7/24/2009 4:30:34 PM
"I give ya $50 for it"....
I will see your $50 bucks and raise to a cool C-Note (or a B-Flat) whichever works!
TW
8^)
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SqurlyMurly
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7/24/2009 8:32:21 PM
thanks guys! your help is much appreciated and i am going to try all you suggested.
it is an original and i love its tone except for the occasional snap, cackle, pop.
i'll let you know how things develop, and again, i thank you!
$50 bucks? throw in a little doe with that and its a deal. : )
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LyinDan
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7/24/2009 11:11:18 PM
It is possible for it to be a dirty tube socket, too. On one of the small tubes. Try nudging the tubes around in their sockets a bit with the amp on (Careful, the tubes get hot, duh)(You'll have to remove the tube shield if the amps still got them. Twist and pull up). If you get a horrendous crackle when you move the tube, turn the amp off. Try jiggling the tube or tubes that did that around in its socket, back and forth, and round and round. Sometimes this will clean it enough to solve the problem. You could get some Radio Shack cleaner to spray into the socket if that doesn't quiet it, but that stuff's not the best. If you spray it, do it with the AC cord unplugged, then insert the tube and jiggle it around to wipe the contacts. Don't spray much in there. Just a little. Then remove the tube and wait for the socket to dry out. Give it 15 minutes, then insert the tube and plug it in.
Don't stick anything metal in the tube socket with the tube out of it. You might get a little jolt and hurt yourself. :)
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