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Re: reverb issue [message #13238 is a reply to message #13234]

Tue, 23 March 2010 14:51

chicagobill
Messages: 2005
Registered: April 2003

Senior Member

I can understand how you feel, but look at it this way, I believe you have by process of elimination narrowed the problem down to the drive circuit of the reverb board.

That section contains two transistors, three caps and seven resistors. Any one of these components can cause the reverb to fail.

Now that you have the board out of the amp, test every resistor from R824 to R830. Do they all read within 10% of the marked value?

How about the three caps C800, C801 and C802, have you checked these with a cap meter? They are common enough and cheap enough that you could just replace all three for a dollar or two. Are the three caps installed correctly?

As for the transistors, swap them with a set of low noise, generic, high gain replacements. Just be certain that they are installed correctly.

What about the pc board itself? Any cold solder joints? Any broken Traces?

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[Message index]

		reverb issue By: cassent5150 on Tue, 23 March 2010 08:41
		Re: reverb issue By: chicagobill on Tue, 23 March 2010 14:51
		Re: reverb issue By: cassent5150 on Wed, 24 March 2010 23:28
		Re: reverb issue By: stevem on Tue, 23 March 2010 16:41
		Re: reverb issue By: cassent5150 on Wed, 24 March 2010 22:57
		Re: reverb issue By: stevem on Thu, 25 March 2010 06:33
		Re: reverb issue By: cassent5150 on Thu, 25 March 2010 20:12
		Re: reverb issue By: chicagobill on Thu, 25 March 2010 16:53
		Re: reverb issue By: cassent5150 on Thu, 25 March 2010 18:06
		Re: reverb issue By: chicagobill on Fri, 26 March 2010 12:18
		Re: reverb issue By: cassent5150 on Fri, 26 March 2010 20:20
		Re: reverb issue By: chicagobill on Sat, 27 March 2010 12:01
		Re: reverb issue By: cassent5150 on Sun, 28 March 2010 13:24
		Re: reverb issue By: stevem on Sun, 28 March 2010 10:29
		Re: reverb issue By: cassent5150 on Sun, 28 March 2010 13:30
		Re: reverb issue By: cassent5150 on Sun, 28 March 2010 22:19
		Re: reverb issue By: stevem on Sun, 28 March 2010 13:33
		Re: reverb issue By: cassent5150 on Sun, 28 March 2010 13:36
		Re: reverb issue By: stevem on Sun, 28 March 2010 13:45
		Re: reverb issue By: stevem on Mon, 29 March 2010 06:01
		Re: reverb issue By: chicagobill on Mon, 29 March 2010 13:03
		Re: reverb issue By: cassent5150 on Mon, 29 March 2010 21:40
		Re: reverb issue By: stevem on Mon, 29 March 2010 13:08
		Re: reverb issue By: chicagobill on Tue, 30 March 2010 11:28
		Re: reverb issue By: stevem on Tue, 30 March 2010 11:38
		Re: reverb issue By: stevem on Tue, 30 March 2010 12:59

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