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Re: Schematic of my version of the LadyDay

Posted by Thorsten on December 20, 2005 at 14:31:15:
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.
Ciao T