19-07-2016, 06:32 PM
(19-07-2016, 05:00 PM)ppppenguin Wrote: The 153 supply isn't actually stabilised but uses something close to a series regulator to vary the output voltage.
That's what it says in Post #1 above Jeffrey
(19-07-2016, 05:00 PM)ppppenguin Wrote: ISTR the series pass valves were similar to EL81 line output.
If you want to use valves something like PL81 line output valves might be a good choice for the series pass. Cheap and rugged. Basically anything with high current/power capability that the audiophools haven't latched on to. They know about EL509 (the 6.3V version of the PL509 colour TV line output bottle) but the PL509, the smaller PL504 and Pl36 might still be plausible. The classic 6080 double power triodes, widely used for series pass in professional valve kit, may be too expensive now.
The Pass Valves are CV428s or equivalent which as far as I can tell from the Data Sheet are entirely adequate.
cv428.pdf (Size: 77.6 KB / Downloads: 5)
(19-07-2016, 05:00 PM)ppppenguin Wrote: The TL783 often forms part of a solid state high voltage supply. I think it can be floated to give higher voltages than 125V but protecting it from output shorts could get interesting. http://www.ti.com/lit/ds/symlink/tl783.pdf
Very simple circuit here: http://www.eleccircuit.com/the-variable-...ly-0-300v/
This site is reputable: http://sound.westhost.com/project151.htm
I have a feeling that Mark Hennessey has a fair bit of accumulated knowledge on PSU design so it would be worth waiting for his input.
They look like interesting Sites but I don't want to rip it to bits, just add some Stabilisation.
Alan
