Well in support of , support of , support of, sort of ...
I grabbed that file ages ago (here or from central or from misfits or ...)
So for Ed , Central , Nomad, the OP and anyone that trips across one of these in mostly complete condition I just uploaded it ....
So I can't remember if Nomad and I had this conversation here or it's the remnants of a bad dream. But that many (beam power pentodes) tubes and all the "tank" capacitance ends up in the tubes with little left over for tune. The Load variable wasn't much more than an old 225pf broadcast variable found in old stereo receivers and the tune wasn't much more than a single moving plate sandwiched between two fixed plates. From memory, the blocking cap was a pair of 500pf doorknobs in parallel and the coil was about 5 turns, 1 1/4" dia , 3/16" copper tube.
The power supply is of particular interest . The bleeder resistance is placed across the entire capacitance and not the individual caps. This can have curious and exciting consequences.
For those of you that can and do the math please educate the unwashed masses. For those of you that don't do the math please listen to those that do. As I recall it's around 35pf (or more) per tube. This gets more than a little "squirrelly" at radio frequencies when you parallel more than 4 tubes. I'm sure I'm not explaining this correctly or sufficiently enough for the digital volt ohm meter with a screw driver crowd (no offense intended) and not to the exacting standards of the professionals here. (remember , I'm a hack) I do know that any attempts to quiet, modify, improve, re-design the tuned circuits of the 12 (or 10) tube Phantom were futile. Believe me I tried when I thought I was Marconi's gift to radio frequency amplification and "knew better" than all these somebodies what to do. Well I didn't , and still don't , and as a matter of fact won't. Only sparks, arcs, catastrophic destruction and tears will ensue.
Have you checked tube depot for current prices of 6MJ6/6LQ6 ? How about ebay ? Have you considered the use of those transformers paralleled and doubled into either a choke or cap input ? I'm suggesting selling the glass and or iron to those that don't know any better and moving on.
Ever seen what happens to a top fuel car between rounds ?
Imagine what happens to to a D&A 12 tube Phantom between 10 minute key downs . The comparison isn't as big a stretch as you might think.
I'd keep the case intact and eventually stick something more well behaved in it just for nostalgia .
...we now return you to our regular thread drift