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Author Topic: Can you help solve hum in my Fender Acoustasonic amp?  (Read 1165 times)
Kipper
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« on: September 28, 2006, 09:58:33 PM »

Hey there. After listening to it much praised, I bought an old model Fender Acoustasonic amplifier. Overall I'm happy with it, but it has a significant buzz that comes up only when I turn up the "master reverb" knob. I hear that this might be something as simple as dust in that knob (I'm crossing my fingers that it's that easy). I sprayed it out with compressed air without result. Anyone have ideas or other inexpensive tricks to try before I take it to a shop?

Thanks,
Kip  bigrin
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drathbun
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« Reply #1 on: September 29, 2006, 03:16:58 AM »

What kind of pickup do you have and what is your proximity to the amp? Have you anything in the signal chain other than your guitar (pedals, effects)?
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Kipper
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« Reply #2 on: September 29, 2006, 05:05:02 AM »

Thanks for the reply, but it's a cure problem rather than a diagnosis problem, I think.  It's a hum that definitely is just something in the amp.  No guitar plugged in, one guitar or another, it's all the same.  Just a background hum that doesn't really change the sound of the amplified sound, just humms in the background.  Doesn't get louder when the volume is turned up, gets louder when the reverb is turned up.  I'm 99.9% it's a knob thing, I just don't know how to fix it.
Kip
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drathbun
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« Reply #3 on: September 29, 2006, 02:54:40 PM »

Sounds like a ground loop problem to me. 
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2014 Taylor 814ce

2014 Godin Multiac Classical

2012 Gibson "The Golden Age 1930's" SJ200

2012 Squier Vintage Modified 70's Jazz Bass

2010 Gretsch Electromatic G5122DC

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1981 Rickenbacker 320JG

1968 Yamaha FG150 Red La
Roman
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« Reply #4 on: October 05, 2006, 07:17:10 PM »

I've heard the tweeter is the culpret and that some folks actually have installed a switch to disable the tweeter when it's not absolutely required.  Just what I've heard . . .
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« Reply #5 on: October 05, 2006, 09:24:44 PM »

Well, if it were a speaker I don't think it'd just do it on the reverb circuit.

It probably is a bad ground.  Either a solder joint or a capacitor has gone bad.  FInd yourself a good repair shop.  Other than cleaning there's not a lot you can do, and there are lethal voltages inside amps.  Don't mess with it if you don't know what you're doing.
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Calvin
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« Reply #6 on: October 08, 2006, 01:18:17 AM »

yeah, dotn mess with electricity if you are not qualified.  1mA can kill you if it's directed at the heart, heck with few good Amps you can fry an elephant.  Stay away if you dont know what you are doing.  As far as I know, if you dont let amp discharge enough time before you use it, you can still get a pretty 'healthy' jolt (and I am not talking about the cola).
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drathbun
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« Reply #7 on: October 08, 2006, 03:43:27 PM »

Yep... a capacitor can store enough charge to seriously harm you well after the power is disconnected.
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1981 Rickenbacker 320JG

1968 Yamaha FG150 Red La
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