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Re: dc voltage at the output [message #22355 is a reply to message #22351]

Wed, 04 February 2015 15:06

chicagobill
Messages: 2005
Registered: April 2003

Senior Member

Having 0.033vdc on the output isn't too bad. If you had 0.33 I'd be a little concerned, but even that level is fairly normal.

Now for your buzz, what happens with a guitar plugged in? Now try turning the guitar's volume control all the way down.

If the amp's volume control changes the buzz, then the problem is located at the input jacks and wiring or in the first stage of the preamp, where you changed the two transistors.

What transistors did you use to replace Q400 and Q401?

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[Message index]

		dc voltage at the output By: smackoj on Wed, 04 February 2015 10:35
		Re: dc voltage at the output By: chicagobill on Wed, 04 February 2015 12:42
		Re: dc voltage at the output By: smackoj on Wed, 04 February 2015 13:41
		Re: dc voltage at the output By: chicagobill on Wed, 04 February 2015 15:06
		Re: dc voltage at the output By: smackoj on Wed, 04 February 2015 16:18
		Re: dc voltage at the output By: chicagobill on Wed, 04 February 2015 16:39
		Re: dc voltage at the output By: smackoj on Wed, 04 February 2015 17:47
		Re: dc voltage at the output By: smackoj on Wed, 04 February 2015 19:40
		Re: dc voltage at the output By: smackoj on Thu, 05 February 2015 09:49
		Re: dc voltage at the output By: stevem on Thu, 05 February 2015 11:10
		Re: dc voltage at the output By: chicagobill on Thu, 05 February 2015 12:32
		Re: dc voltage at the output By: smackoj on Thu, 05 February 2015 17:24
		Re: dc voltage at the output By: chicagobill on Thu, 05 February 2015 17:35
		Re: dc voltage at the output By: smackoj on Thu, 05 February 2015 17:57
		Re: dc voltage at the output By: pleat on Fri, 06 February 2015 19:27
		Re: dc voltage at the output By: chicagobill on Thu, 05 February 2015 23:52
		Re: dc voltage at the output By: stevem on Fri, 06 February 2015 06:18
		Re: dc voltage at the output By: smackoj on Fri, 06 February 2015 08:47
		Re: dc voltage at the output By: smackoj on Fri, 06 February 2015 10:08
		Re: dc voltage at the output By: chicagobill on Fri, 06 February 2015 12:49
		Re: dc voltage at the output By: smackoj on Fri, 06 February 2015 17:42
		Re: dc voltage at the output By: chicagobill on Sat, 07 February 2015 00:39
		Re: dc voltage at the output By: smackoj on Sat, 07 February 2015 04:52
		Re: dc voltage at the output By: stevem on Sat, 07 February 2015 07:39
		Re: dc voltage at the output By: smackoj on Sat, 07 February 2015 10:28
		Re: dc voltage at the output By: chicagobill on Sat, 07 February 2015 11:56
		Re: dc voltage at the output By: smackoj on Sat, 07 February 2015 12:57

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