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That seems to make sense now and thanks so much for explaining it. So the 1B3 filament is not getting the power it needs b/c that 2.7 ohm resistor is way out of tolerance. Theory is someone thought they could fix that condition by dropping the resistance of the HV filter resistor (470k down to 150k) to increase HV? But that would not work b/c tube still not getting filament juice it needs. Do I have it?
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-Al
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