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Re: Repair advise [message #19065 is a reply to message #19064]

Fri, 09 August 2013 16:28

chicagobill
Messages: 2005
Registered: April 2003

Senior Member

If the amp was affected by a lightning strike, I would think that the main power supply would have been damaged, not just one channel board. More likely the board just decided to act up.

What you are describing sounds like a bad solder joint. Either that or a bad cap. I think Pleat has a story about the white Mallory caps and the factory assemblers.

If you are handy with a soldering iron you can fix it up with no problems. You will need a low wattage iron (25 watts) and some rosin core solder.

Turn off and unplug the amp from the wall outlet. Then unbolt the PC103 board from the chassis. Be sure not to pull too hard on any of the wires that connect to it. Carefully inspect the bottom of board where the copper traces are and see if you can see any broken solder joints. Even though the noise happens when you touch the caps, check the entire board as it may be something else that is loose.

If you find something that is loose, reheat the joint with your iron, adding a small amount of new solder to help flow the solder on the joint. Reinstall the board and test to see if the noise has gone away and more importantly if the channel works again.

If the noise continues, a lead that goes into the cap may have come loose and while securely soldered to the board is still not making a good connection on the inside of the cap.

Let us know what you find.

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[Message index]

		Repair advise By: Jonomega3 on Fri, 09 August 2013 15:44
		Re: Repair advise By: chicagobill on Fri, 09 August 2013 16:28
		Re: Repair advise By: Jonomega3 on Fri, 09 August 2013 19:56
		Re: Repair advise By: chicagobill on Fri, 09 August 2013 21:36
		Re: Repair advise By: Jonomega3 on Sat, 10 August 2013 07:52
		Re: Repair advise By: pleat on Sat, 10 August 2013 08:15
		Re: Repair advise By: Jonomega3 on Sat, 10 August 2013 08:31
		Re: Repair advise By: Jonomega3 on Sat, 10 August 2013 18:09
		Re: Repair advise By: Jonomega3 on Sat, 10 August 2013 23:30
		Re: Repair advise By: Jonomega3 on Sat, 10 August 2013 14:50
		Re: Repair advise By: chicagobill on Sat, 10 August 2013 12:55
		Re: Repair advise By: chicagobill on Sun, 11 August 2013 14:34
		Re: Repair advise By: Jonomega3 on Sun, 11 August 2013 14:46
		Re: Repair advise By: Jonomega3 on Sun, 11 August 2013 16:17
		Re: Repair advise By: chicagobill on Sun, 11 August 2013 22:20
		Re: Repair advise By: Jonomega3 on Sun, 11 August 2013 22:41
		Re: Repair advise By: chicagobill on Sun, 11 August 2013 22:53
		Re: Repair advise By: Jonomega3 on Mon, 12 August 2013 12:19
		Re: Repair advise By: chicagobill on Mon, 12 August 2013 12:57
		Re: Repair advise By: Jonomega3 on Mon, 12 August 2013 22:43
		Re: Repair advise By: chicagobill on Tue, 13 August 2013 00:26
		Re: Repair advise By: Jonomega3 on Tue, 13 August 2013 10:34
		Re: Repair advise By: chicagobill on Tue, 13 August 2013 11:35
		Re: Repair advise By: Jonomega3 on Tue, 13 August 2013 12:06
		Re: Repair advise By: Jonomega3 on Tue, 13 August 2013 13:33
		Re: Repair advise By: chicagobill on Tue, 13 August 2013 13:38
		Re: Repair advise By: Jonomega3 on Tue, 13 August 2013 13:48
		Re: Repair advise By: Jonomega3 on Tue, 13 August 2013 15:03
		Re: Repair advise By: chicagobill on Tue, 13 August 2013 15:08
		Re: Repair advise By: Jonomega3 on Tue, 13 August 2013 15:23
		Re: Repair advise By: chicagobill on Tue, 13 August 2013 16:16
		Re: Repair advise By: Jonomega3 on Tue, 13 August 2013 16:37
		Re: Repair advise By: chicagobill on Tue, 13 August 2013 17:16
		Re: Repair advise By: Jonomega3 on Tue, 13 August 2013 17:37
		Re: Repair advise By: chicagobill on Tue, 13 August 2013 18:16
		Re: Repair advise By: pleat on Tue, 13 August 2013 21:18
		Re: Repair advise By: Jonomega3 on Tue, 13 August 2013 21:52
		Re: Repair advise By: pleat on Wed, 14 August 2013 07:23
		Re: Repair advise By: Jonomega3 on Wed, 14 August 2013 09:07
		Re: Repair advise By: chicagobill on Wed, 14 August 2013 12:33
		Re: Repair advise By: Jonomega3 on Thu, 15 August 2013 08:59
		Re: Repair advise By: chicagobill on Thu, 15 August 2013 13:26
		Re: Repair advise By: Jonomega3 on Thu, 15 August 2013 13:41
		Re: Repair advise By: chicagobill on Thu, 15 August 2013 15:17
		Re: Repair advise By: Jonomega3 on Thu, 15 August 2013 15:40
		Re: Repair advise By: chicagobill on Thu, 15 August 2013 16:15
		Re: Repair advise By: Jonomega3 on Thu, 15 August 2013 16:29
		Re: Repair advise By: chicagobill on Fri, 16 August 2013 12:16
		Re: Repair advise By: Jonomega3 on Fri, 16 August 2013 13:12
		Re: Repair advise By: chicagobill on Fri, 16 August 2013 13:36
		Re: Repair advise By: Jonomega3 on Fri, 16 August 2013 13:39
		Re: Repair advise By: chicagobill on Fri, 16 August 2013 14:55
		Re: Repair advise By: Jonomega3 on Fri, 16 August 2013 15:27
		Re: Repair advise By: chicagobill on Fri, 16 August 2013 15:52
		Re: Repair advise By: Jonomega3 on Fri, 16 August 2013 16:00
		Re: Repair advise By: chicagobill on Fri, 16 August 2013 16:41
		Re: Repair advise By: Jonomega3 on Fri, 16 August 2013 20:44

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