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Ah... Atma-Sphere's lamp boards...

Ah... Atma-Sphere's lamp boards...
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Yeh, the designer (Ralph) is a good guy with nice knowledge of tube design. Paralleling that many tubes certainly lowers the output impedance but I just can't fathom keeping that many soldiers inline.Ah... Atma-Sphere's lamp boards...
The birth of OTL Futterman was an interesting man.Yeh, the designer (Ralph) is a good guy with nice knowledge of tube design. Paralleling that many tubes certainly lowers the output impedance but I just can't fathom keeping that many soldiers inline.![]()
Thanks I've been following this forum for some time but only recently signed up and started contributing to the Patreon. What Amir is doing is way too interesting for me to ignore, especially being an engineer myself.Hello and welcome @metal571 ,
Good to have you here. Would be glad to also see others big YT guys around (like DMS mentioning ASR in his Atom review).![]()
PS I still really love the McIntosh aesthetic. Don't know why.
Ah... Atma-Sphere's lamp boards...
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a preview of what to expect.
View attachment 21290
The schematic will be similar to this one but with other output cap values and R7 being 1k:
Hum could be caused by the heaters being fed AC (wires aren't twisted either) or could be picking up hum on the anode of input tube as it sticks out above the amp and is not screened.
In the latter case getting near the tube with your hand should change hum.
If that isn't the case it most likely is the AC on the heaters.
Also possible that it is the wiring layout but when changing tubes changes the hum this may not be the case.
Hello and welcome @metal571 ,
Good to have you here. Would be glad to also see others big YT guys around (like DMS mentioning ASR in his Atom review).![]()
Ithe only tube headphone amplifier that I would have any interest in:
https://quicksilveraudio.com/products/headphone-amplifier/
notice the output impedance at 2.2 ohms...
Mike Sanders has been making tube products at Quicksilver since 1981. He is a measurement guy and his products have always tested well with JA at Stereophile. In addition, all his designs use point-to-point wiring and Quicksilver designs have become legendary for their reliability and longevity. At $995 I can't afford it but perhaps one of our other members will find it interesting.
the music seems to be Bi aural -coming from "outside of the Headphones " instead of middle of my head ! for me this is a must have item
It can be if the individual enjoys himself. People do things to make them happy, can that be faulted?Isn’t coached sighted listening a wonderful thing?![]()
Yeah I should warned you that won't always work. It worked with the stock tube, well like 30 minutes of burn in, but I've put many hours in on the new production tubes that hum very badly and it made zero difference.As suggested earlier, I took out the power tube and let a badly humming NOS RCA 6sn7 burn in for a couple of days. Dang if it didn’t stop humming entirely! It puzzles me what makes the Darkvoice so sensitive to unused tubes, but this harebrained scheme actually worked.