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Re: 200B 5 PA head hum/hiss issue [message #28133 is a reply to message #28094]

Mon, 22 March 2021 14:55

Drjones1106
Messages: 19
Registered: March 2017
Location: Seattle

Junior Member

Actually, I do have an oscilloscope. Albeit an older, funky CRT. I should able to get measurements out of it, if not super accurate ones. If you'll tell me what parameters to set up/ what I'm looking for I can run some tests. I've got a signal generator too. I'm not super knowledgeable about using it for specific measurements, I mostly use it to find noise, and look at waveform clipping in the guitar pedals I build. But I can always hit up youtube university if I need more info.
regardless any audio testing will have to wait for Thursday. I desoldered Q703 yesterday to test, and one of the legs fell off. So that could have been causing some issues. I'll have a replacement nte108 here then. I also picked up uf5404 diodes for a new rectifier, cause why not.
The Peavey cabs in parallel measure, surprisingly, 4ohms exactly.

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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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