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In Reply to: Schematic of my version of the LadyDay posted by Bas Horneman on December 19, 2005 at 16:20:52:
Hi,Nice one Bas, just a few notes....
1) The 12R resistor pair are heater balancers, so use these or the Humpot/Resistor combo instead, not both. My own use with two sets of resistors on each side of the heater balances the Cathode currents out of each side of the heater.
2) The 0.47uF X 2 Capacitors after the rectifier are really "tuning" capacitors, set so you get the kind of HT you want. I was operating the 300B with 350V/60mA with effectively 6K nominal Load (3K OPT Mismatched). Add a few uF to get the HT up to around 450V.
Also the RC circuit across the choke should be adjusted for lowest ripple.
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To infinity and beyond!!!
:-P
and went to bed.
Nix Text!
and my Dragonfly's are out on loan...I have the LD's connected to the pc for running in. With little speakersdrivers on the floor. My CSS FR 125'S also on loan.But I'll add a little switch to the first 2uF C to try it when I have my Prometheus up and running..and will report my findings.
1.) Thanks...yes..stupid of me..2.) Do you think it will sound better with 450VDC? I also chose the lower voltage and lower current you aimed for because I think you wrote somewhere that you actually prefer lower voltage and lower current for the 300b soundwize.
Hi,> I think you wrote somewhere that you actually prefer lower
> voltage and lower current for the 300b soundwizeActually, I prefer Higher Load, Higher Voltage, Lower Current.
nt.
To infinity and beyond!!!
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