The good news is that the 866 Mercury vapor tubes have a fairly low voltage drop (about 15 Volts) so changing over to a set of 1N4007 diodes (4) should work. Given the higher supply voltage these days, plate loading should be set lower, such as around 300 mA for AM and 350 mA for CW.
Thanks for that information, so solid state should work out fine. I will look over the circuit tomorrow. Perhaps it is not as difficult as I am thinking it is.
What type of solid state rectifier replacements are those? Any #?
Thanks, Rich
Rich, these came from RF Parts quite a while ago. Were like 50 bucks each.
They are They are the FAA 1N2637 rectifiers.