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k150-8 [message #14395]

Fri, 24 September 2010 13:11

Bill
Messages: 64
Registered: March 2002
Location: Kansas

Member

I bought a k150-8, non working, pilot light works, no sound at speakers. Found someone had reversed the monitor and speaker outputs on the output board, wired the speakers as a short. I fixed these things and now have signal all the way through the amp, but it has a whoop-whoop-whoop sound, that is not affected by the volume or other controls,puts out about 20 volts ac--don't see any dc. Someone has replaced one driver with an SK3024, and the thermal diode was replaced by a 116 diode, and not placed in the chassis heat sink. Three other transistors have been changed on the premap board. I will try to isolate where it's coming from--either preamp or power board first.
Bill C

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[Message index]

		k150-8 By: Bill on Fri, 24 September 2010 13:11
		Re: k150-8 By: Bill on Fri, 24 September 2010 14:37
		Re: k150-8 By: chicagobill on Fri, 24 September 2010 14:49
		Re: k150-8 By: Bill on Fri, 24 September 2010 17:31
		Re: k150-8 By: Bill on Fri, 24 September 2010 17:59
		Re: k150-8 By: stevem on Sun, 26 September 2010 13:53

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