开云体育

True statement Jim!

Some sort of protection is definitely needed to prevent arcing the power switch on "make" (or break) ?

I'm using a solid state relay to completely eliminate stress on the "un-obtanium" switch .?

(I also put one in my AC-4 too....no more thumps or bangs inside the AC-4,? nor sparks inside the T-4XC switch)



3-500's are good up to 4000V.? I'm thinking that 2700V probably won't? "hurt" them. And when tuning for maximum output, the tubes should be tuned at the voltage and (max) current they'll be drawing at peak for lowest grid current and best linearity.???

Grid current is also a little lower at the at the higher voltages.? Drake only did the "tune" position to meet the FCC max power (single-tone/CW 1KW input)? of the time.

If you want to be "easy" on the amp, just drive it to a lower power output. (lower drive = lower grid/plate current and output)

I am re-building the power supply for my Hallicrafters HT-45 Loudenboomer (single 3-400) using a plate transformer out of a Drake L-4PS. ? ? It'll get the same SSR and won't be wired for switchable plate voltage.