I owned a solidtube for a short time bad comes to mind. I did like the capsule mount and the transformer did not look bad.
If I was to rebuild it I would use the Royer CF circuit like the CB microphone, PDF is at jensen.com. I would use a ef86 cathode follower and the capsule with a >=2.2uf to the transformer. Now the fil supply would need to be dropped to about 6VDC and the B+ maybe to 100V.
I would take out the foam inside the grill. I would get rid of the led that makes the tube glow. I would point to point it. There has to be alot of solidtubes not being used for anything.
If I was to rebuild it I would use the Royer CF circuit like the CB microphone, PDF is at jensen.com. I would use a ef86 cathode follower and the capsule with a >=2.2uf to the transformer. Now the fil supply would need to be dropped to about 6VDC and the B+ maybe to 100V.
I would take out the foam inside the grill. I would get rid of the led that makes the tube glow. I would point to point it. There has to be alot of solidtubes not being used for anything.