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Old 17th April 2011, 04:17 AM   #1
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Question Marshal amp is being quiet

Hey guys. Got something for you all.

I just got a marshall bass 12 amp from a goodwill for 25.00 dollars. And it is being quiet. It is not even competing with an acoustic. Is there anything that i need to check on it?? it does also have a gain nob that must be on 4 for it to work. anyone have any fixes?? I want to use the amp, but it is not working for me. Thanks. its hard to find anything on the net.
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Old 17th April 2011, 05:23 AM   #2
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WHAT IS THE MODEL NUMBER?
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Old 17th April 2011, 05:25 AM   #3
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t27329 I think. That is what is stamped to the front
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Old 17th April 2011, 11:12 AM   #4
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Quote:
Originally Posted by stolenband View Post
t27329 I think. That is what is stamped to the front
That doesn't sound like a Marshall number?, try looking on the back.
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Old 17th April 2011, 01:07 PM   #5
teemuk is offline teemuk  Finland
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I think the only Marshall Bass 12 would be 5501.

Quote:
Is there anything that i need to check on it?? it does also have a gain nob that must be on 4 for it to work. anyone have any fixes??
Plenty, for starters:
- Contact intermittency? / condition of solder joints
- Potentiometer / jack corrosion and overall condition, use some contact cleaner
- Output transistors ok?

If these don't help start tracing signal from input towards output and see what stage fails to amplify or what stage causes too much attenuation.

Last edited by teemuk; 17th April 2011 at 01:11 PM.
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Old 17th April 2011, 09:33 PM   #6
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Here is the schematic. jer


Need schematics: Marshall 5501 Bass 12-amplifier - TalkBass Forums
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