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845 op points

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.




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  • 845 op points - vinnie2 06:19:57 02/23/19 (0)

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