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Cap symptoms
Posted: 26 Mar 2001 3:23 pm
by Larry Clark
How can you tell when it's time to get a cap job done on an amp. I've got a Musicman 65-112 that is starting to get a little noisy. It's a 25 year old amp that hasn't been played too hard or too frequently. It has been recently re-tubed which had no effect on the noise. Thanks, Larry Clark
Posted: 26 Mar 2001 6:24 pm
by Donny Hinson
What kind of noise do you have, Larry? Filter caps usually make an amp hum. Electrolytic bypass caps sometimes cause squeals or "motorboating" (a plop-plop sound). On the other hand, when the coupling caps go bad (these are the little ones) you get distortion, or "clipped" sounds...kinda like a fuzztone (or a bad speaker).
Sometimes, tubes can cause their own brand of noises, called "microphonics". This type of noise is a "bonging", or ringing sound, or sometimes even feedback.<FONT SIZE=1 COLOR="#8e236b"><p align=CENTER>[This message was edited by Donny Hinson on 26 March 2001 at 06:25 PM.]</p></FONT>
Posted: 26 Mar 2001 9:16 pm
by Jerry Erickson
Here's a guy's address from Vintage Guitar Mag: Terry Loose
628 George St.
Clyde, OH 43410
Sorry there's no ph # maybe information will have it.
Jerry
Posted: 26 Mar 2001 9:53 pm
by Larry Clark
Donny, It's a definately a hum,makes you want to flip the ground switch which unfortunately has no effect. Considering it hasn't blown a fuse in 25 years I guess it deserves a check-up from an amp tech. Thanks, Larry<FONT SIZE=1 COLOR="#8e236b"><p align=CENTER>[This message was edited by Larry Clark on 26 March 2001 at 09:54 PM.]</p></FONT>
Posted: 27 Mar 2001 4:19 am
by Rick Johnson
Larry
Try David Allen at
www.allenamps.com
He's the best tech and builds a killer amp too!!!
Rick
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Rick Johnson
Posted: 27 Mar 2001 5:07 pm
by Dennis Detweiler
John LeMay at Miracle Audio will help also.
Dennis
Posted: 10 Apr 2001 8:22 am
by David Rich
If the amp is 25 years old and has never had a cap job, and it's humming. I'd say it definately needs new caps.