Diode cathode (banded end) to the CF grid, the diode anode to the CF cathode, i.e., reverse-biased.
Thanks for that.I'm using 3 X OA2 regulators in each channel.2 for 300v and 1 for 150 to feed the ecc85.Is this a good idea or should I use a resistor to drop the 150v for the ecc85.
Normally, you use a combination of a resistor and a regulator tube, if that's the path you want to take. Size the resistor to account for the expected current draw of the stage plus enough current to run the regulator tube.
yes that is what I have done using Ohm's law from my mental toolbox and a calculator.I've settled on a value between 3.2 and 4k to drop 125v from the 300v rail to run the OA2 for the input stage and am working on 5mA per section for the ecc85 and 10mA per parallel 6SN7.The mains tranny is 330-0-330 rated at 200mA so I've got plenty to play with.Possibly an off-board phono stage at some point.I've also got a toroidal 0-9 0-9 @1A each to build regulated filament supplies for the 6SN7's using LT1086's as well.
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