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Would it be possible to make a solid state vacuum tube?

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TimFox:
I think that the first FETRON was designed by Teledyne to replace 6AK5/5654 pentodes in specific  communications gear.  An interesting Teledyne ad:  https://www.qsl.net/kh6grt/page4/tubesters/Fsht39.pdf

Pawelr98:
ECL86 is expensive.
But the PCL86 which is basically the same tube is not expensive.

Just get a 13-14V source for the heater.
A voltage doubler from 6.3Vac should be able to reach it.

You may also try PCL82 which is even cheaper.
Worse than 86 but it should be able to replace it as an output tube.
Pinouts are different so it would have to be rewired (if it's point to point wiring, PCB would require an adapter).

The PCL tubes were produced in mass numbers as they were used for TV's that didn't have mains transformers and the heaters were powered directly from mains.

ECL tubes just ran out because the production numbers were low and this caused the prices to skyrocket.

Online is one place to buy tubes.
Flea markets is another, you may try to get a decent deal there.
Just recently I bought two brand new PCL82, in a box for 0.5USD each.

As for solid state, just get a high voltage FET and make it so that there's a positive gate bias.
There's a transformer already (no hot chassis) so you could also ditch the output transformer and use the 6.3V heater voltage to power a small TDA chip or whatever is available.

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