If it were me going to build a new sweep tube type amp, I'd look at the new
6550 tubes. Their maximum dissapation is around 40 watts which equals a 6LF6 in
power. They dont have an anode cap, and the anode comes out of a pin on the
base. That can be worked around easy by mounting the tune C and load C under
the chassis. The tank coil can be put on top of the chassis and connected to
both capacitors through ceramic feedthroughs. That's actually the best way to
do any of them as the chassis shields the coil from the capacitors. One could
build that easily using a 3" deep chassis which is commercially available from
Hammond. I have a few new 6550's here that I started to build a prototype.
Maybe I'll get back into it and build one just to see how it works.
Best,
Will
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