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Re: K100B-5 [message #25904 is a reply to message #25801]

Mon, 13 February 2017 13:01

chicagobill
Messages: 2005
Registered: April 2003

Senior Member

Great to hear. Start by cleaning all of the pots. I suggest using DeoxIt brand cleaner, it's the best that I've used.

The reverb only turns off with the footswitch, so don't use one for now. The first thing to do is to test the reverb tank itself. Disconnect the reverb tank wires from the pc board side. Set your meter to read resistance, use the 2,000 ohms scale. Read the resistance across the ends of the RCA plugs. You should get a reading of about 180 ohms or so on both plugs.

If you get OL readings on either end, check to be sure that the cables are making good contact. If one or both sides still read open, you'll have to remove the black foam rubber cover from the open side of the tank to inspect the small wires that connect the transducer coils to the RCA jacks. These wires often break from flexing. If you find any broken ones, resolder them and test the resistances again. Once you know that the tank is okay, plug it back in and retest the reverb function of the amp.

Channel 4 may get better after the amp has been on for a while. See what happens after cleaning the pots and testing the reverb tank.

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[Message index]

		K100B-5 By: irish77060 on Fri, 27 January 2017 13:03
		Re: K100B-5 By: chicagobill on Fri, 27 January 2017 20:27
		Re: K100B-5 By: irish77060 on Fri, 27 January 2017 22:48
		Re: K100B-5 By: irish77060 on Mon, 30 January 2017 10:56
		Re: K100B-5 By: chicagobill on Mon, 30 January 2017 11:43
		Re: K100B-5 By: stevem on Sat, 28 January 2017 06:26
		Re: K100B-5 By: chicagobill on Sun, 29 January 2017 17:14
		Re: K100B-5 By: stevem on Mon, 30 January 2017 11:31
		Re: K100B-5 By: chicagobill on Mon, 30 January 2017 12:33
		Re: K100B-5 By: irish77060 on Mon, 30 January 2017 13:35
		Re: K100B-5 By: chicagobill on Mon, 30 January 2017 14:41
		Re: K100B-5 By: irish77060 on Wed, 01 February 2017 14:06
		Re: K100B-5 By: chicagobill on Wed, 01 February 2017 16:49
		Re: K100B-5 By: irish77060 on Thu, 02 February 2017 11:51
		Re: K100B-5 By: irish77060 on Thu, 02 February 2017 11:56
		Re: K100B-5 By: chicagobill on Thu, 02 February 2017 12:43
		Re: K100B-5 By: irish77060 on Thu, 02 February 2017 12:54
		Re: K100B-5 By: chicagobill on Thu, 02 February 2017 17:22
		Re: K100B-5 By: irish77060 on Tue, 07 February 2017 14:54
		Re: K100B-5 By: chicagobill on Tue, 07 February 2017 20:59
		Re: K100B-5 By: irish77060 on Wed, 08 February 2017 14:25
		Re: K100B-5 By: chicagobill on Wed, 08 February 2017 15:18
		Re: K100B-5 By: irish77060 on Wed, 08 February 2017 15:51
		Re: K100B-5 By: chicagobill on Wed, 08 February 2017 15:57
		Re: K100B-5 By: irish77060 on Wed, 08 February 2017 17:13
		Re: K100B-5 By: chicagobill on Wed, 08 February 2017 18:02
		Re: K100B-5 By: irish77060 on Fri, 10 February 2017 13:28
		Re: K100B-5 By: chicagobill on Fri, 10 February 2017 21:33
		Re: K100B-5 By: irish77060 on Sat, 11 February 2017 11:18
		Re: K100B-5 By: chicagobill on Sat, 11 February 2017 11:39
		Re: K100B-5 By: irish77060 on Sat, 11 February 2017 17:50
		Re: K100B-5 By: irish77060 on Sun, 12 February 2017 07:27
		Re: K100B-5 By: irish77060 on Sun, 12 February 2017 12:11
		Re: K100B-5 By: chicagobill on Sun, 12 February 2017 14:32
		Re: K100B-5 By: irish77060 on Sun, 12 February 2017 19:07
		Re: K100B-5 By: chicagobill on Sun, 12 February 2017 19:17
		Re: K100B-5 By: irish77060 on Mon, 13 February 2017 12:17
		Re: K100B-5 By: chicagobill on Mon, 13 February 2017 13:01
		Re: K100B-5 By: irish77060 on Mon, 13 February 2017 13:07
		Re: K100B-5 By: irish77060 on Mon, 13 February 2017 13:31
		Re: K100B-5 By: stevem on Mon, 13 February 2017 13:47
		Re: K100B-5 By: irish77060 on Mon, 13 February 2017 16:20
		Re: K100B-5 By: chicagobill on Mon, 13 February 2017 18:25
		Re: K100B-5 By: irish77060 on Tue, 14 February 2017 10:36
		Re: K100B-5 By: stevem on Tue, 14 February 2017 06:24
		Re: K100B-5 By: irish77060 on Tue, 14 February 2017 10:38
		Re: K100B-5 By: chicagobill on Tue, 14 February 2017 10:55
		Re: K100B-5 By: irish77060 on Tue, 14 February 2017 15:07
		Re: K100B-5 By: irish77060 on Tue, 14 February 2017 19:12
		Re: K100B-5 By: chicagobill on Wed, 15 February 2017 02:18
		Re: K100B-5 By: irish77060 on Wed, 15 February 2017 13:25

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