|
Audio Asylum Thread Printer Get a view of an entire thread on one page |
For Sale Ads |
89.164.208.44
In Reply to: RE: 5687 & OB2 as an excellent HT regulator posted by NAQTEN8 on February 23, 2015 at 14:07:13
What about if resistors are rearranged like this?
Follow Ups:
If things are arranged like that, the 0B2 doesn't serve any purpose.
I would imagine that the actual circuit uses the gas regulator to set the grid voltage on the 5687, then the regulated B+ can be drawn from the cathode.
This supply is for something which can only impact rather than improve the sound : a tubed SPDIF buffer
May as well build it as-is and use for the intended purpose of being the power supply of a totally useless/worthless gimmick that some audiophools just have to have . I can almost see it now , an IT coupled 300B SPDIF buffer . All you need to do is market it , forget deveopment , just make it look pretty and give it a silly name . You could make a heap of cash...
Al
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 02/25/15
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.
--------------------------
Buy Chinese. Bury freedom.
x
Oh dear, I hadn't noticed. What a horrible idea!
Post a Followup:
FAQ |
Post a Message! |
Forgot Password? |
|
||||||||||||||
|
This post is made possible by the generous support of people like you and our sponsors: