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With the 6DQ5 removed*, check for plate voltage (pin 6) of the H osc tube. If it's missing, trace back component-by-component toward the 380V source.
*Even with the plate cap disconnected, the 6DQ5's screen grid (G2) will get cooked when there's no drive on G1 (the drive signal is what develops the negative bias voltage on G1).
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