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Original Message
RE: Schematic shows 5U4 5V4
Posted by PeterI on June 14, 2017 at 10:24:22:
Thanks for advice. I have both 5U4 and 5V4, and 5V4 gives slightly higher B+. I have GZ34 to try as well.
Now at 405v plates, 1.20V at cathode, -32V at grid. Pretty close.
Adjusting bias, I can get the B+ to go up, but cathode voltage drops to around 1V.Rough calculation of current: 1.21v / 26ohm (each side of 52ohm balance pot) = 46.5mA ?
Anyway, not worried about it much.