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Original Message
RE: CCS with Cathode Resistor in a long tail ?
Posted by KevinC on September 19, 2016 at 09:40:01:
I'm sorry, but I should have caught the sign. It does need to be a negative voltage, and the greater the better, to a point. I don't hear any discernible improvement with more negative than -25V in my circuits.
In my 6N6P listening days I found that the tube sounded very much better at 20-25mA with about 150 volts cathode to plate. I can imagine it wouldn't be very exciting at 8mA, whereas the 6922 would shine at 7mA and 150V!
Just to confound you a bit more, I prefer the sound of balanced driver stages with current source plate loads and a simple unbypassed common cathode resistor. Of course, you can use a common cathode CCS connected to a negative supply, but then you need to add a load resistor to ground for each input tubs so you can set the plate voltage.