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Re: K150-6 pumps out DC voltage when powered on. [message #27684 is a reply to message #23707]

Tue, 25 February 2020 07:20

stevem
Messages: 4733
Registered: June 2004
Location: NY

Senior Member

Forgive my oversite here, but you have a early model K150, and I have been looking at the schematic for a late K150 model with the 5033 board.

The early model 150s like yours still use the K100s +8 and -8 volt regulator sections and preamp section, so besides Q5 maybe going bad as the issue, something in that + 8 volt regulator circuit could be the bottom line on your issue maybe?

To narrow this down when the amp acts up check to see if your + 8 volts ( red wire to preamp boards) is still 8 volts when you have that 27 volts on the output.

By the way you do not need to keep a speaker load hooked up once the issue starts, this will save your ears and speakers!

[Updated on: Tue, 25 February 2020 07:22]

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		K150-6 pumps out DC voltage when powered on. By: corybrown on Mon, 24 August 2015 14:21
		Re: K150-6 pumps out DC voltage when powered on. By: pleat on Mon, 24 August 2015 15:02
		Re: K150-6 pumps out DC voltage when powered on. By: corybrown on Mon, 24 August 2015 15:06
		Re: K150-6 pumps out DC voltage when powered on. By: chicagobill on Mon, 24 August 2015 17:07
		Re: K150-6 pumps out DC voltage when powered on. By: stevem on Tue, 25 August 2015 06:27
		Re: K150-6 pumps out DC voltage when powered on. By: corybrown on Sun, 30 August 2015 13:42
		Re: K150-6 pumps out DC voltage when powered on. By: chicagobill on Sun, 30 August 2015 14:12
		Re: K150-6 pumps out DC voltage when powered on. By: stevem on Mon, 31 August 2015 06:38
		Re: K150-6 pumps out DC voltage when powered on. By: corybrown on Tue, 11 February 2020 19:13
		Re: K150-6 pumps out DC voltage when powered on. By: chicagobill on Wed, 12 February 2020 14:52
		Re: K150-6 pumps out DC voltage when powered on. By: corybrown on Wed, 12 February 2020 17:32
		Re: K150-6 pumps out DC voltage when powered on. By: corybrown on Wed, 12 February 2020 22:54
		Re: K150-6 pumps out DC voltage when powered on. By: stevem on Thu, 13 February 2020 06:40
		Re: K150-6 pumps out DC voltage when powered on. By: corybrown on Thu, 13 February 2020 18:25
		Re: K150-6 pumps out DC voltage when powered on. By: corybrown on Thu, 13 February 2020 20:11
		Re: K150-6 pumps out DC voltage when powered on. By: stevem on Fri, 14 February 2020 06:44
		Re: K150-6 pumps out DC voltage when powered on. By: corybrown on Sun, 16 February 2020 23:04
		Re: K150-6 pumps out DC voltage when powered on. By: chicagobill on Mon, 17 February 2020 12:38
		Re: K150-6 pumps out DC voltage when powered on. By: stevem on Tue, 18 February 2020 06:08
		Re: K150-6 pumps out DC voltage when powered on. By: corybrown on Thu, 20 February 2020 21:16
		Re: K150-6 pumps out DC voltage when powered on. By: stevem on Fri, 21 February 2020 06:18
		Re: K150-6 pumps out DC voltage when powered on. By: corybrown on Fri, 21 February 2020 21:20
		Re: K150-6 pumps out DC voltage when powered on. By: stevem on Sat, 22 February 2020 06:28
		Re: K150-6 pumps out DC voltage when powered on. By: corybrown on Sat, 22 February 2020 11:20
		Re: K150-6 pumps out DC voltage when powered on. By: stevem on Sun, 23 February 2020 06:30
		Re: K150-6 pumps out DC voltage when powered on. By: corybrown on Mon, 24 February 2020 19:58
		Re: K150-6 pumps out DC voltage when powered on. By: stevem on Tue, 25 February 2020 07:20
		Re: K150-6 pumps out DC voltage when powered on. By: corybrown on Tue, 25 February 2020 09:47
		Re: K150-6 pumps out DC voltage when powered on. By: stevem on Tue, 25 February 2020 12:17
		Re: K150-6 pumps out DC voltage when powered on. By: corybrown on Thu, 27 February 2020 21:28
		Re: K150-6 pumps out DC voltage when powered on. By: chicagobill on Sun, 01 March 2020 01:03
		Re: K150-6 pumps out DC voltage when powered on. By: corybrown on Sun, 01 March 2020 11:45
		Re: K150-6 pumps out DC voltage when powered on. By: chicagobill on Sun, 01 March 2020 16:15
		Re: K150-6 pumps out DC voltage when powered on. By: corybrown on Mon, 02 March 2020 12:51
		Re: K150-6 pumps out DC voltage when powered on. By: corybrown on Mon, 02 March 2020 20:55
		Re: K150-6 pumps out DC voltage when powered on. By: corybrown on Mon, 02 March 2020 22:07
		Re: K150-6 pumps out DC voltage when powered on. By: stevem on Tue, 03 March 2020 06:06
		Re: K150-6 pumps out DC voltage when powered on. By: corybrown on Tue, 03 March 2020 07:16
		Re: K150-6 pumps out DC voltage when powered on. By: stevem on Tue, 03 March 2020 07:42
		Re: K150-6 pumps out DC voltage when powered on. By: corybrown on Tue, 03 March 2020 09:13
		Re: K150-6 pumps out DC voltage when powered on. By: corybrown on Fri, 06 March 2020 18:59
		Re: K150-6 pumps out DC voltage when powered on. By: stevem on Sat, 07 March 2020 06:18
		Re: K150-6 pumps out DC voltage when powered on. By: corybrown on Sat, 07 March 2020 21:25
		Re: K150-6 pumps out DC voltage when powered on. By: chicagobill on Sun, 08 March 2020 00:09
		Re: K150-6 pumps out DC voltage when powered on. By: corybrown on Sun, 08 March 2020 16:28
		Re: K150-6 pumps out DC voltage when powered on. By: chicagobill on Sun, 08 March 2020 19:43
		Re: K150-6 pumps out DC voltage when powered on. By: corybrown on Sun, 08 March 2020 21:41
		Re: K150-6 pumps out DC voltage when powered on. By: corybrown on Sun, 08 March 2020 21:56
		Re: K150-6 pumps out DC voltage when powered on. By: stevem on Mon, 09 March 2020 05:55
		Re: K150-6 pumps out DC voltage when powered on. By: corybrown on Mon, 09 March 2020 08:38
		Re: K150-6 pumps out DC voltage when powered on. By: corybrown on Mon, 09 March 2020 11:59
		Re: K150-6 pumps out DC voltage when powered on. By: chicagobill on Mon, 09 March 2020 12:54
		Re: K150-6 pumps out DC voltage when powered on. By: corybrown on Sat, 14 March 2020 17:40
		Re: K150-6 pumps out DC voltage when powered on. By: chicagobill on Sat, 14 March 2020 21:58
		Re: K150-6 pumps out DC voltage when powered on. By: corybrown on Sun, 15 March 2020 10:51
		Re: K150-6 pumps out DC voltage when powered on. By: chicagobill on Sun, 15 March 2020 13:55
		Re: K150-6 pumps out DC voltage when powered on. By: corybrown on Sun, 15 March 2020 19:05
		Re: K150-6 pumps out DC voltage when powered on. By: stevem on Mon, 16 March 2020 06:06
		Re: K150-6 pumps out DC voltage when powered on. By: corybrown on Mon, 16 March 2020 18:56
		Re: K150-6 pumps out DC voltage when powered on. By: chicagobill on Mon, 16 March 2020 16:10
		Re: K150-6 pumps out DC voltage when powered on. By: stevem on Tue, 17 March 2020 07:46
		Re: K150-6 pumps out DC voltage when powered on. By: corybrown on Sat, 21 March 2020 11:34
		Re: K150-6 pumps out DC voltage when powered on. By: corybrown on Sat, 21 March 2020 11:57
		Re: K150-6 pumps out DC voltage when powered on. By: stevem on Sat, 21 March 2020 12:26
		Re: K150-6 pumps out DC voltage when powered on. By: chicagobill on Sat, 21 March 2020 15:10
		Re: K150-6 pumps out DC voltage when powered on. By: corybrown on Sat, 21 March 2020 15:26
		Re: K150-6 pumps out DC voltage when powered on. By: corybrown on Sat, 21 March 2020 16:42
		Re: K150-6 pumps out DC voltage when powered on. By: chicagobill on Sat, 21 March 2020 20:10
		Re: K150-6 pumps out DC voltage when powered on. By: corybrown on Sun, 22 March 2020 12:24
		Re: K150-6 pumps out DC voltage when powered on. By: stevem on Mon, 23 March 2020 06:06
		Re: K150-6 pumps out DC voltage when powered on. By: stevem on Thu, 26 March 2020 06:59
		Re: K150-6 pumps out DC voltage when powered on. By: corybrown on Fri, 27 March 2020 21:12

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