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I don't have an affective way to check hv on this set but I have an analog meter that goes to 1 kv and when I touch to see what it is it shows 1 kv but then the screen blanks out until I remove the meter probe. I check right off the 1b3 to see the hv. The 12sn7 you refer to is the vert a Amp as being possibly biased wrong? I did the resistance test from the SAMs chart and all were perfect except pin 4-8 of v20 positive rec tube it starts running into the Meg ohm area when it states 120k.
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