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12.10.199.11
In Reply to: RE: Harman Kardon TA5000X output transformers posted by Tubecase on May 06, 2016 at 05:22:09
"How do you regulate the g2 B+ at a fraction of the anode B+?"
Use a Maida style regulator. I suggest you buy Tom's PCB, in its fully populated version. Pay the man his money and leave SMDs to an expert.
Tom's PCB is highly competent. You might have enough current for the screen grids and the small signal circuitry. ;>)
Eli D.
Follow Ups:
I really dislike the jerks running that board. I'd design my own rather than join again.
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Buy Chinese. Bury freedom.
To each his own.
A direct link to Tom's PCB is provided below.
Eli D.
There's no real documentation at that site. Do you have a schematic to share?
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Buy Chinese. Bury freedom.
You can read the thread, without signing up. Unfortunately, access to the uploaded stuff is unavailable.
Perhaps Mike Maida's seminal paper (linked below) will prove beneficial.
Eli D.
!
The Mind has No Firewall~ U.S. Army War College.
Whenever semiconductors are used to monitor and directly adjust a DC voltage, and that voltage powers vacuum tubes, there's the risk of degrading the sound qualities for which the tubes themselves have been employed. We've been creating superb sound for decades with vacuum tubes, and with no need to resort to circuitry of this type.
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Buy Chinese. Bury freedom.
There is also the possibility of better results than either tubes or SS, standing alone, can deliver.
Be pragmatic! Results, not preconceived notions, are what matter.
Eli D.
I don't disagree, although there's something to be said for the legacy of all-tube circuitry. My point though was that one must be selective and not assume that the advantages of SS won't bring degradation to the system. The specific application and implementation are all-important.
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Buy Chinese. Bury freedom.
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