[Boatanchors] Heath Warrior bias supply (was WTB: 6.3VAC/20A and 10VAC/low current transformer)

[Rick Poole WA1RKT]

Several people have answered me privately regarding the Heath Warrior filament/bias transformer, and one has offered to give me a 6.3VAC 20A transformer for the cost of shipping (THANKS!).

Now I'm thinking, though, that I might not want to continue with the original bias circuit design.  That design provides a negative 4.5 volts of bias during operation, but does not provide for any internally-generated cut-off bias voltage during receive times... the exciter or some other external source needs to provide that cut-off bias of from -45 to -150 VDC.

A previous owner of this amp had installed an internal antenna changeover relay (undocumented, of course), presumably so the amp could be used with a transceiver.  I'm thinking I might convert that to use a circuit more like the 30L-1, where the bias is supplied by a separate transformer (actually the 30L-1 uses a separate winding on the power transformer) and generates nominally -160 volts cut off bias, which also runs the antenna changeover relay so that when the relay is pulled in during transmit, the bias reduces to around -5 volts.

Anybody see any problem with any of that?

For that I'll need the 6.3VAC-CT transformer at 20 amps as before, but now I'll need about a 120VAC transformer for the bias supply instead of the 10VAC one, if anyone has one of those to part with.

Thanks...

Rick WA1RKT