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That's not the heater supply

Look at the green 2.5v leads. They lead (with a paralelled hum pot) directly to the heater of the 2A3 via pins 1 and 4. This is the AC heater supply I am referring to.

The rectifed signal is used for the 6sn7s, but not the output tube.

I've got 2 schematics (separated by 2 years) for the Moondog and both show the rectified low level supply (BR1), so I am curious why someone thought removing it would be a good thing. Whenever I've seen reference to an AC heater, it always been discussed in context of the output tubes.



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