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Tubejunke, this may have just been "a slip of the pen," but feel that I have to point it out just to be sure: with reference to replacing the 6X5 with diodes, you wrote:
If I interpret it right it looks very simple in that you simply wire in the two 1N4007 diodes' anode where the plates would be; eliminating them (plates) from the circuit. On the other end it's solid state diode cathode to chassis ground. The heater string resistance is in the left in circuit tube for originality.
Note that the cathodes of the diodes don't go to chassis ground (which would represent a dead short!) They go to the field coil and the + end of the first filter cap.
As to the 6X5 heater, yes, it can be left connected for show, but disconnecting it would give the sometimes feverish Zenith power xfrmr a bit of a break!
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Reece
Perfection is hard to reach with a screwdriver.
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