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Hum / oscillactions in EL84 push-pull amp
Hum / oscillactions in EL84 push-pull amp
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Old 11th November 2019, 09:04 AM   #21
Chris Hornbeck is offline Chris Hornbeck  United States
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Originally Posted by parilex View Post
Since both channels are equally affected, something like this seems most plausible to me. I'm pretty sure it's not external interference, as the measurements at another location were exactly the same. The amplitude of the oscillations is indeed very small and does not influence the sound reproduction noticeably. I am simply tempted to find or explain the cause of such problems/phenomena.

This is a worthy goal, and if I have inadvertently expressed myself poorly please forgive and accept an alternative description:


By "external", I only meant external to the intentional signal path. Noise sources in the power supplies are a possible example. You've ruled out distant noise sources, so your task is easily manageable. You see these pulses at twice AC line frequency? That's a good clue. What can you safely see with that software scope?


It looks like it might be a powerful tool to look at this issue, but you need to maintain a safety protocol looking into high Voltage power supplies.


All good fortune,
Chris
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Old 11th November 2019, 09:10 AM   #22
Chris Hornbeck is offline Chris Hornbeck  United States
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I am on duty for the next few days

And that's another thing. Nobody tries to invade Switzerland because you guys are badass and you know where the bodies are buried. Respect.
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Old 12th November 2019, 08:12 AM   #23
disco is offline disco  Netherlands
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And that's another thing. Nobody tries to invade Switzerland because you guys are badass and you know where the bodies are buried. Respect.
Ever smelled the cheese they make overthere? Makes a Vulcan cry.
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Old 12th November 2019, 07:06 PM   #24
Chris Hornbeck is offline Chris Hornbeck  United States
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They even have tactical cheese. Badass.
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