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Re: 200B 5 PA head hum/hiss issue [message #28152 is a reply to message #28094]

Sat, 27 March 2021 14:36

Drjones1106
Messages: 19
Registered: March 2017
Location: Seattle

Junior Member

With 1khz @ 1v signal at the monitor jack, I read 5.38v across the load resistor. Rails at =37.6v and -37.3v.
With the 1khz @ .5v signal at the input and volume at full, the monitor jack reads 0.014v ac.
On a whim I tried all the channels. 1+4 are the same, channel 2 is a little lower, 0.012v. but channel 3 is very low, 0.006v. But I'll come back to that later, once the other stuff is working.
So it looks like I need to nail down board 803. I'll start testing all the components in the next day or two.
I'll update as I go. thanks again Steve.

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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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