Can anyone tell me what are the normal plate voltages
used on this tube in the two modes? I'm trying to figure out
what plate transformer to look for or try to cobble up?

I've googled lots of these amplifiers but see no mention
of CW/RTTY mode voltages/currents. It looks like about
3000V on SSB but see not mention of other modes. My SB220
had a tap on primary at the SQR2 point to switch modes,
would that be the same for this tube? What would be good
parameters for CW/RTTY operation?

Thanks.

WA5DXP