Hi all,
5A6 was used in PRC 8/9/10 VHF transceivers. Single tube FM with AFC oscillator for 1W out.
A parallel of two 5A6 class C could provide 8 or 10 W on HF bands: very interesting !
Filament OFF during receive and low filament consumption: very interesting.
During RX this QRP TX will be completely switched off, then go trough: "filament on" - "filament on with vfo" - "filament on with full TX" with a 4 position rotary switch, that will be the "manual" sequencer.
I am still elaborating on the possible circuit.
5A6 is a tube with potentials, I think.
Giorgio
http://hilltoparmyradios.com/TM%2011-612%20PRC-10.pdf