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Re: K-200B-2 Hum/feedback [message #25610 is a reply to message #25590]

Thu, 29 September 2016 14:22

chicagobill
Messages: 2005
Registered: April 2003

Senior Member

Try this. Pull both of the plugs on the pc board keeping the tank plugged in. Now test the continuity of the grounds from one cable plug to the other.

It sounds to me like the head is oscillating when the reverb is turned up. The 3-15 cabinet is lower in impedance than the two, so the power amp may be effected by the lower output load.

On the back panel where the speaker jacks are, are the blue wires that connect the speaker jacks to the pc board pushed close to the tank?

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[Message index]

		K-200B-2 Hum/feedback By: slk854 on Mon, 26 September 2016 17:34
		Re: K-200B-2 Hum/feedback By: chicagobill on Mon, 26 September 2016 19:01
		Re: K-200B-2 Hum/feedback By: slk854 on Mon, 26 September 2016 19:50
		Re: K-200B-2 Hum/feedback By: slk854 on Mon, 26 September 2016 20:16
		Re: K-200B-2 Hum/feedback By: chicagobill on Tue, 27 September 2016 02:59
		Re: K-200B-2 Hum/feedback By: stevem on Tue, 27 September 2016 05:53
		Re: K-200B-2 Hum/feedback By: slk854 on Tue, 27 September 2016 11:33
		Re: K-200B-2 Hum/feedback By: chicagobill on Tue, 27 September 2016 18:11
		Re: K-200B-2 Hum/feedback By: slk854 on Tue, 27 September 2016 21:53
		Re: K-200B-2 Hum/feedback By: chicagobill on Tue, 27 September 2016 23:24
		Re: K-200B-2 Hum/feedback By: stevem on Wed, 28 September 2016 05:51
		Re: K-200B-2 Hum/feedback By: stevem on Wed, 28 September 2016 19:19
		Re: K-200B-2 Hum/feedback By: slk854 on Wed, 28 September 2016 21:55
		Re: K-200B-2 Hum/feedback By: stevem on Thu, 29 September 2016 05:58
		Re: K-200B-2 Hum/feedback By: slk854 on Thu, 29 September 2016 08:44
		Re: K-200B-2 Hum/feedback By: stevem on Thu, 29 September 2016 09:51
		Re: K-200B-2 Hum/feedback By: slk854 on Thu, 29 September 2016 11:27
		Re: K-200B-2 Hum/feedback By: chicagobill on Thu, 29 September 2016 12:06
		Re: K-200B-2 Hum/feedback By: slk854 on Thu, 29 September 2016 12:31
		Re: K-200B-2 Hum/feedback By: chicagobill on Thu, 29 September 2016 14:22
		Re: K-200B-2 Hum/feedback By: slk854 on Thu, 29 September 2016 17:17
		Re: K-200B-2 Hum/feedback By: slk854 on Thu, 29 September 2016 20:28
		Re: K-200B-2 Hum/feedback By: stevem on Fri, 30 September 2016 06:10
		Re: K-200B-2 Hum/feedback By: slk854 on Fri, 30 September 2016 13:26
		Re: K-200B-2 Hum/feedback By: pleat on Fri, 30 September 2016 15:05
		Re: K-200B-2 Hum/feedback By: slk854 on Fri, 30 September 2016 16:28
		Re: K-200B-2 Hum/feedback By: slk854 on Fri, 30 September 2016 18:31
		Re: K-200B-2 Hum/feedback By: chicagobill on Fri, 30 September 2016 20:54
		Re: K-200B-2 Hum/feedback By: slk854 on Fri, 30 September 2016 23:13
		Re: K-200B-2 Hum/feedback By: stevem on Sat, 01 October 2016 06:28
		Re: K-200B-2 Hum/feedback By: chicagobill on Sun, 02 October 2016 01:41

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