[sdiy] Re: [AH] Vacuum Tube Motherboard

Jay Schwichtenberg jays at aracnet.com
Wed Jun 5 17:06:15 CEST 2002


As someone who has dealt with audio in the PC I wonder how this works from a
noise standpoint. One of the hardest parts of building a PC or designing a
card for one (especially audio stuff) is the EMI and noise inside. You look
at the FCC/CE EMI scans and there is a lot of high frequency energy running
around. Most of it is above 50 to 100 mHz and you can pick out the various
clocks and their harmonics. Anyway. Tubes have a lot of open surface area on
the plates which stand up parallel to the cards in the box. It seems that
these would act as big antennas and just suck up and high freq stuff. Is the
fact that the frequencies are so high that they don't affect the audio?
Another thing could be that they are so high they are beyond the frequency
response of the tube.


PS: I've always enjoyed your Glass Audio articles.

> -----Original Message-----
> From: owner-synth-diy at dropmix.xs4all.nl
> [mailto:owner-synth-diy at dropmix.xs4all.nl]On Behalf Of
> metasonix at earthlink.net
> Sent: Wednesday, June 05, 2002 12:57 AM
> To: analogue at hyperreal.org
> Cc: synth-diy at dropmix.xs4all.nl
> Subject: [sdiy] Re: [AH] Vacuum Tube Motherboard
> >Tube output from your PC! Yes, it's true! Well, maybe. Several
> comments on
> >Slashdot suggest it's a hoax. Interesting if it's for real...
> uses a single
> >dual-triode tube...http://www.hardocp.com/article.html?art=MzAy
> You gentlemen would be very surprised to learn
> how big tube audio is in Asia. AOpen is in Taiwan.
> This product was inevitable.
> You will see more PCs with tube audio sections built in.
> Some Slashdot people mocked the thing--
> but that company will sell many tens of thousands
> of mobos in Asian countries.
> (Actually, I thought seriously about making
> a super-exotic PC with a built-in tube amplifier and a
> big impressive looking art-deco cabinet with eye tubes
> to indicate disk-drive status. But the FCC EMC testing
> requirements were very costly to perform on PCs. I need
> an investor to do this. Anyone got a spare $1 mil?)
> E. Barbour
> metasonix

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