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In Reply to: RE: I'm surprised no-one has mentioned what this is for... posted by Al Noakes on February 24, 2015 at 12:12:49
Well yes it can easily be done, I'd reach for a 12TA7 or 6C4 myself. After all SPDIF at 44/48K is standard NTSC video bandwidth, 6mhz, and tubes were used there for many years even inout old TV sets of the 60s.But why??????
What possible sonic advantage can a tube SPDIF buffer have?
P.S. It would most likely have to be the dreaded cathode follower. Remember that SPDIF uses a 75ohm terminated transmission line. You need to drive a volt into that.
Edits: 02/25/15 02/25/15Follow Ups:
I'm not an expert in designing circuits, but I have more than 20 years of experience in the audio hobby. I've owned and listened to the very best CD players and transports (Esoteric, Wadia, CEC, Audio Note...) during that time, and I also find it very hard to believe that this magical Cd performance comes from a fairly simple regulated supply and 6922 spdif buffer as shown at the attached picture. All the other ingredients are off the shelf CD pro2 with cheap chinese controller and clock. If someone has an idea why I'm getting such results, please explain. The sound of this machine gives me an insight into the music similar to vinyl. It's hard to describe, but music is more alive and it flows. No oscilloscope so no way to measure the signal coming in and out of the buffer, but when it sounds like this I find it not too important how the signal looks at the screen.
FWIW, a 75 ohm load really needs a SRPP, not a standard follower. That's the sort of load SRPPs were originally intended to drive.
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