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Re: 200B 5 PA head hum/hiss issue [message #28104 is a reply to message #28099]

Thu, 11 March 2021 20:30

Drjones1106
Messages: 19
Registered: March 2017
Location: Seattle

Junior Member

So I checked the +/-8v circuit, and it is off, but only a little. I don't know how much is grounds for concern. +7.9v and -7.79v. to me that seems close enough. I also don't see and small tan electrolytics on the power board. Only orange drops and tan ceramics. Next up I'll try adding some caps to the rectifier, but to clarify your saying 0.01uf @200v caps, and they should go across all the terminals? like one for every diode of the rectifier? I don't have any UF5404 diodes on hand, would something like a 1n4007 work? I think those are the highest voltage I have on hand. I would try and check the output transistors but I am nervous about removing them. As for matching them, would I just be trying to get Hfe matched?
Thanks again for the help.

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[Message index]

		200B 5 PA head hum/hiss issue By: Drjones1106 on Tue, 09 March 2021 22:47
		Re: 200B 5 PA head hum/hiss issue By: stevem on Thu, 11 March 2021 07:11
		Re: 200B 5 PA head hum/hiss issue By: Drjones1106 on Thu, 11 March 2021 09:51
		Re: 200B 5 PA head hum/hiss issue By: Drjones1106 on Thu, 11 March 2021 20:30
		Re: 200B 5 PA head hum/hiss issue By: chicagobill on Thu, 11 March 2021 12:06
		Re: 200B 5 PA head hum/hiss issue By: Drjones1106 on Thu, 11 March 2021 13:21
		Re: 200B 5 PA head hum/hiss issue By: chicagobill on Fri, 12 March 2021 00:38
		Re: 200B 5 PA head hum/hiss issue By: stevem on Fri, 12 March 2021 07:23
		Re: 200B 5 PA head hum/hiss issue By: Drjones1106 on Fri, 12 March 2021 12:40
		Re: 200B 5 PA head hum/hiss issue By: stevem on Fri, 12 March 2021 14:04
		Re: 200B 5 PA head hum/hiss issue By: Drjones1106 on Fri, 12 March 2021 14:59
		Re: 200B 5 PA head hum/hiss issue By: Drjones1106 on Mon, 15 March 2021 18:02
		Re: 200B 5 PA head hum/hiss issue By: stevem on Wed, 17 March 2021 06:04
		Re: 200B 5 PA head hum/hiss issue By: Drjones1106 on Sun, 21 March 2021 18:09
		Re: 200B 5 PA head hum/hiss issue By: stevem on Mon, 22 March 2021 07:00
		Re: 200B 5 PA head hum/hiss issue By: Drjones1106 on Mon, 22 March 2021 14:55
		Re: 200B 5 PA head hum/hiss issue By: stevem on Mon, 22 March 2021 17:16
		Re: 200B 5 PA head hum/hiss issue By: Drjones1106 on Mon, 22 March 2021 17:30
		Re: 200B 5 PA head hum/hiss issue By: Drjones1106 on Thu, 25 March 2021 16:50
		Re: 200B 5 PA head hum/hiss issue By: stevem on Fri, 26 March 2021 06:12
		Re: 200B 5 PA head hum/hiss issue By: stevem on Fri, 26 March 2021 16:45
		Re: 200B 5 PA head hum/hiss issue By: Drjones1106 on Fri, 26 March 2021 19:01
		Re: 200B 5 PA head hum/hiss issue By: stevem on Fri, 26 March 2021 21:46
		Re: 200B 5 PA head hum/hiss issue By: stevem on Sat, 27 March 2021 07:40
		Re: 200B 5 PA head hum/hiss issue By: Drjones1106 on Sat, 27 March 2021 14:36
		Re: 200B 5 PA head hum/hiss issue By: stevem on Sat, 27 March 2021 15:50
		Re: 200B 5 PA head hum/hiss issue By: Drjones1106 on Sat, 27 March 2021 22:09
		Re: 200B 5 PA head hum/hiss issue By: stevem on Sun, 28 March 2021 08:11
		Re: 200B 5 PA head hum/hiss issue By: Drjones1106 on Wed, 07 April 2021 18:48
		Re: 200B 5 PA head hum/hiss issue By: stevem on Thu, 08 April 2021 05:54
		Re: 200B 5 PA head hum/hiss issue By: Drjones1106 on Fri, 09 April 2021 20:54

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