[dtvmcdonald]

I got a replacement MHD4 today and it works exactly as well
as the original and has no shorts. The metallic coating has cracked in a
couple of places but of course this is an audio tube and that
is immaterial.

I also got two 3 1/2 inch "shielded" speakers which indeed are well shielded.
They clearly produce a better sound when mounted next to each other
in series than one alone or in parallel, so I installed both in
the radio with ... don't scroll down if you are fastidious ...




cardboard, a big piece of styrofoam, and some duct tape for
holding it all in and blocking the sound from getting out where
unwanted. This is good and sturdy and will do for now.

Surely lower bass than the original, sounds OK.

The only remaining problem can't be easily cured. Its a minor
wobbling in the picture due to 60Hz magnetic fields from the
power transformers. The cure I used on my TRK12,
a MuMetal photomultiplier shield on the CRT neck, won't
work because of the big tube base. In the TRK12 it was much worse
(at 0.03 = 60-59.97 Hz of course).