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I don't address wiring filaments separately.
It would defeat my purpose.
My focus is on running the system as close
to "as designed" as possible- on the dynamotor, with
it's control boxes, no wires hanging out of the sides etc.
First- the radio has to work. Mummy-Radios gather no interest,
so they don't survive long-term.
Second- It has to work as close to "as-designed" as is practical
($500 worth of tubes for a QRP radio isn't practical).
Drilling holes, changing connectors, etc. strictly forbidden.
I have done so successfully and repeatedly, using 6AQ5, 5763
and a set of original tubes, resulting in many good QSOs on both
CW and AM. I'm working on presenting the
information; it's just going to take some time. I am very slow
in my old age.
73 OM DE Dave AB5S
You will need all 4 tubes installed , even to run as a MOPA , because the transmit tube filaments are both in series with the modulator tubes.That is, Unless you are doing the "bypass heater wiring with 6.3 vac " and just grounding the cathodes with the original filament pins as previously discussed? The cathodes and heaters are isolated in this configuration, but requires added wiring to the heaters .