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Original Message
RE: biasing setup on Scott 222D question
Posted by Michael Samra on March 19, 2017 at 11:28:33:
Randy
Just put a 10 ohm resistor to ground on each cathode.Then,you simply adjust for 0vdc between each pair of tube's cathodes with the DC balance pot.Then you adjust your bias to the current you want.I think the 7189s are 28ma to 30ma depending on your B+.