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RE: schematic

Perfect!

Let's look at your schematic.

If the tubes are linear then when the current increases in one tube, the current will decrease, by the same amount, in the other tube.

So the AC current flowing through the Power supply/common cathode node will be equal and opposite.

Equal but opposite current is the same as no current at all and the AC signal path will bypass those nodes and include the whole primary winding and the both tubes only.

If there is no net AC current through the cathode resistor/power supply node then we are left with one AC current loop just as Lynn shows.

The current loops you are showing are for the DC only.

Tre'

Have Fun and Enjoy the Music
"Still Working the Problem"


Edits: 08/22/11
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