Strange Buzzing problem

Gordon303 · 05-30-2007, 11:29 PM

My amp is a 1980 Fender 75 ,and whenever i turn it on, it makes a loud buzzing sound. The buzz is also very random. I could turn it on and it will start buzzing immediately, or i could be playing for five minutes and then it will start buzzing. Can anyone tell me what's wrong with it and how i can fix it? Please

Mars Amp Repair · 05-31-2007, 01:50 AM

is buzz present with volume turned down....guitar unplugged? Try balling up your fist & banging the amp hard on the top....does buzz change? If so you're probably looking at a bad connection in the amp somewhere. glen

Enzo · 05-31-2007, 02:29 AM

I agree, if banging the top of the amp either makes the hum stop or makes the hum start - of it affects the hum at all - there is a loose connection. Most likely one or more of the main filter caps needing resoldering.

Don Symes · 05-31-2007, 02:37 AM

There's also the step of checking that all the jacks are tight - especially the input jack. Some models rely on that connection for ground.

R.G.Keen has this great tube amp debug page - and a lot of the diagnostic steps apply to solid state, too.

Hope this helps!

Gordon303 · 05-31-2007, 02:41 AM

well i dont know if i described the sound right. Its more of a loud fluttery BRRRRRRRR!, but my dad said cone isn't busted. I also hit the top of the amp just to check and it didn't affect BRRRRRRRR sound.

05-30-2007, 11:29 PM	#1
Gordon303 Junior Member Join Date: May 2007 Posts: 2	Strange Buzzing problem My amp is a 1980 Fender 75 ,and whenever i turn it on, it makes a loud buzzing sound. The buzz is also very random. I could turn it on and it will start buzzing immediately, or i could be playing for five minutes and then it will start buzzing. Can anyone tell me what's wrong with it and how i can fix it? Please

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05-31-2007, 01:50 AM	#2
Mars Amp Repair Senior Member Join Date: Sep 2006 Location: Englewood, CO Posts: 668	is buzz present with volume turned down....guitar unplugged? Try balling up your fist & banging the amp hard on the top....does buzz change? If so you're probably looking at a bad connection in the amp somewhere. glen

05-31-2007, 02:29 AM	#3
Enzo Senior Member Join Date: May 2006 Location: Lansing, Michigan, USA Posts: 10,254	I agree, if banging the top of the amp either makes the hum stop or makes the hum start - of it affects the hum at all - there is a loose connection. Most likely one or more of the main filter caps needing resoldering.

05-31-2007, 02:37 AM	#4
Don Symes Senior Member Join Date: May 2006 Posts: 145	There's also the step of checking that all the jacks are tight - especially the input jack. Some models rely on that connection for ground. R.G.Keen has this great tube amp debug page - and a lot of the diagnostic steps apply to solid state, too. Hope this helps!

05-31-2007, 02:41 AM	#5
Gordon303 Junior Member Join Date: May 2007 Posts: 2	well i dont know if i described the sound right. Its more of a loud fluttery BRRRRRRRR!, but my dad said cone isn't busted. I also hit the top of the amp just to check and it didn't affect BRRRRRRRR sound.

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