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Working on an Admiral 20X12

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#11

12-07-2015, 06:22 PM

old_coot88 old_coot88 is offline

VideoKarma Member

Join Date: Sep 2009

Posts: 2,641

The 6AS5 is used as a B+ dropper in lieu of a big fat resistor. There should be well over a hundred volts at the cathode (pin 1).
The tube voltage chart says 0V. on pin 1, which is flat out wrong. Typical Sams screwup.

What's the voltage on the plate (pin 7) and screen grid (pin 6)? The chart voltages look 'waay too low here, too.

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