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K200B6 [message #28291]

Tue, 10 August 2021 17:08

aeroboy47
Messages: 15
Registered: September 2019

Junior Member

I posted last year about this amp. It's the one that had a #12 wire soldered across the fuse and had several bad transistors and the shorted bias diodes. After I got the parts replaced and the amp working again, I was concerned about the 120mv DC voltage at the output. I'm back working on it now and I have replaced other parts and the DC voltage at the output is now 48mv DC. I'm guesssing that 0vdc would be ideal but dont see that happening unless someone has ideas about what to do nest. I have replaced Q1-Q4, Q701-Q709 and CR701-CR703. All the voltage readings I have been able to take are very close to the schematic values except Q707 collector is at -2.4 vdc and Q703 collector is at +4.6vdc. Any technical expertise would be appreciated.

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[Message index]

		K200B6 By: aeroboy47 on Tue, 10 August 2021 17:08
		Re: K200B6 By: stevem on Wed, 11 August 2021 09:53
		Re: K200B6 By: aeroboy47 on Wed, 11 August 2021 12:45
		Re: K200B6 By: stevem on Thu, 12 August 2021 09:24
		Re: K200B6 By: aeroboy47 on Thu, 12 August 2021 12:14
		Re: K200B6 By: stevem on Fri, 13 August 2021 07:33
		Re: K200B6 By: aeroboy47 on Fri, 13 August 2021 12:15
		Re: K200B6 By: stevem on Fri, 13 August 2021 19:51
		Re: K200B6 By: aeroboy47 on Sun, 15 August 2021 12:03
		Re: K200B6 By: aeroboy47 on Tue, 31 August 2021 18:09
		Re: K200B6 By: aeroboy47 on Fri, 03 September 2021 17:53

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