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Original Message
845 op points
Posted by vinnie2 on February 23, 2019 at 06:19:57:
I think I have now tweaked the 845 about as much as I can. It sounds pretty good and the op points are close to target values.
Target values
plate volts 430 vdc
plate current 62mA
grid volts -51 vdc
As breadboarded now
plate volts 487 vdc
plate current 62.2 mA
grid volts -52.2 vdc
I like the sound of it in mono, so now it's time to breadboard the other channel and see how it sounds in stereo. After that I will take another shot at the 813. Wish I had some low voltage target op points for it, but I have not found any so far.