Trying to find the valve of the 2 resistors that go to pin 2&11 and the one that goes to pin 5 & 9 on both tubes. 5&9 are wired straight across the 2 tubes, so you only have 1 resistor. Also i can only turn the -vdc down to -157 vdc . I put a NTE5156a zener 100v x 5w. The pot someone put between the zener an ground will turn down too 3 ohms. 238
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