Looks fine to me. I'd make some small changes. I would use a more common pass tube, and reduce the capacitor across the reference tube. Maybe not use a filter choke. All minor stuff.
Yeah, read all the Steve Bench stuff. Good, thorough stuff... I always wondered how the older standard designs (like the one above) does compared with a few more decades of development and technology....
It's actually quite similar to a design (attached) I used. It works pretty good, and gave an output voltage deviation of 0.8Vdc for a 40V variation at the input side. Used here as a screen supply.
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I've always thought using valve regulation for valve amps is akin to a cat chasing its' tail. What hasn't been addressed is....Will you be using tube regulation for the heaters??? If so, you have more tube circuits to obtain your 2.5 VDC, 6.3 VDC, 12.6 VDC...........and what will you use to "regulate" the heaters for THOSE tubes.....see what I mean? On and on it goes!
Myself I just run a plain linear supply, tube rectifyed for B+.......let it go where it may..but use sand for the heaters. I'm not really into chasing my tail!
____________________________________________________Rick.........
Myself I just run a plain linear supply, tube rectifyed for B+.......let it go where it may..but use sand for the heaters. I'm not really into chasing my tail!
____________________________________________________Rick.........
A regulator makes heavy use of negative feedback, and is likely to have a non-trivial output impedance variation with frequency. It can be as hard to get right as the amplifier it feeds. There is a case for regulated supplies for a phono preamp, because of the high LF gain and the need to isolate the signal from mains voltage variations. Elsewhere it is, in my opinion, usually unnecessary.
If you are pursuing voltage stabilization, have you considered transistorized stabilization/regulation? They will provide more reliable regulation while requiring no heater voltage with the added benefit of no tone coloring because they never see any signal gain.
It is still understandable to use Valve rectos. They are cool and classic and can still be worked with. Keep in mind though, sag will be reduced when using any regulation. Just be sure to keep those limiting resistors in series with the anodes (which are absent from the schem posted) and the reservoir limits in check.
It is still understandable to use Valve rectos. They are cool and classic and can still be worked with. Keep in mind though, sag will be reduced when using any regulation. Just be sure to keep those limiting resistors in series with the anodes (which are absent from the schem posted) and the reservoir limits in check.
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