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The 6BK4 was pretty much the only HV regulator, IIRC. There's like one or two others. I think GE had a Compactron one. They all were probbably just repackaged versions of the same tube.
I remember seeing ads in old TV mags for a big recall on them in the 70's (Radiation scare!).
RCA had that pulse regulator setup, but it seems that shunt regs were common up until the end of the tube era (though I've seen tube set schematics with doublers and triplers, solid state). Didn't a few of RCA's portables have shunt regs too?
Oh yeah, didn't RCA flip flop between a solid state and tube focus rect? ISTR the CTC 16s have tubes (the 38/39ish I think did), but the 15 and 11 (?) didn't.
Interesting - the lead covered HV rect. I've seen 'em. I wonder how they got around HV arcing issues? Weren't later 6BK4s made of a thick leaded glass, too?
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