some day figuring out PT output will be simple!

[olddawg]

I guess I should just say be careful cleaning up old equipment out of the desert, especially military stuff. I'm in San Diego County and there used to be tons of surplus stuff and stuff coming out of the desert. I know techs that contracted both Valley Fever and Hantavirus from blowing out equipment. Military stuff can be contaminated with who knows what, especially if it is old.

[deci belle]

olddawg said:

The A Bomb blast turned many of his cows white on one side.

Ya, there was a legendary surplus store up there called the "Black Hole". The man died finally and the family tried to get rid of everything in the last couple years. I never went there, though— dangs!!

What about all those people who got Leukemia working on set for that famous Hollywood feature. The Studio even brought TONS of that yellow powdery dirt to L.A. to finish scenes… That's ALL over that town now, so many people got the usual cancers related to uranium tailings exposure.

I'm from L.A. and worked over 20 years in camera department… heard so many stories about that stuff.

Ooooooooh!! Atomic age PT mojo!! Now I'm stoked!

Tubeswell~ Don't I need to have 180~200mA for a pair of 6L6s? My 380v (loaded) low-pwr tweed twin PT puts out about 477 plate-volts with (2) 5U4GBs, here in the shadows of Los Alamos… Eeeeee!! One 5U4 only gets me to 470v. I was trying to get away from all those volts. With the SS rectifier switched on it puts out 500v. That amp (Showman) really wants 430v…

I had to have a PT that had a 5v tap AND fit the '66 Showman chassis perfectly, for that project. I oops'd on that 5E8 PT, I should have gotten the 350v 5F8 PT, live and learn…

This build inspiration was for all the old Los Alamos 6V6 tubes I've harvested over the last few years~ the 315v PT worked well, but 325v would have nailed the plate-volts I was aiming for (they didn't offer 325v in the 5f6 application PT I required). I'm about 10v lower than I wanted.

Maybe the 390v PT could power a SE EL34 amp. I just got three Mullard ('70~73) EL34s from another friendly neighborhood mad scientist/ham radio guy.

I don't know anything about those tubes.

I'll ask about that kind of amp on another thread some day!

[tubeswell]

Tubeswell~ Don't I need to have 180~200mA for a pair of 6L6s? My 380v (loaded) low-pwr tweed twin PT puts out about 477 plate-volts with (2) 5U4GBs, here in the shadows of Los Alamos… Eeeeee!! One 5U4 only gets me to 470v. I was trying to get away from all those volts. With the SS rectifier switched on it puts out 500v. That amp (Showman) really wants 430v…

If they are 2x 6L6 operating in ClassAB1, (where each tube cuts out for 20-40% of the cycle where the other tube peaks), and 3 x dual triodes, methinks you should be able make the HT supply work with 150mA. The power supply won't be as solid as a 5F6A bassman but it should still work. But 180-200mA would leave more in reserve.