Quote:
Originally Posted by old_tv_nut
You missed the minus sign
Pin 2, G1 is -120, pin 3, K is -50 to +67
So G1 to K is -70 to -187, Sams says -172, so that's within range of the SAMS.
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These voltages don’t seem correct... according to the 3kp4 data sheet, typical grid cut off is at most -90 volts not -172
https://frank.pocnet.net/sheets/168/3/3KP1.pdf
jr