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Sorry, those are penthodes, the 6SR7 is almost the same tube as the 6SQ7, but with a lower mu or amplification factor. A triode with detector plates, all tied to ground or B-.
I looked at the schematic again and the 22 ohm resistor across the heater of the 6SQ7 is located in the ballast tube. Insane!
04-07-2018, 11:32 AM
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