Electronics > Projects, Designs, and Technical Stuff

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

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SK_Caterpilar_SK:
I have found a rather more and more common issue in my old radios..most of the ones I can get my hands have most of the tubes nearly shot. The biggest pain however is the power output vacuum tube. The ECL86 is a really problematic tube.. It develops a insane amounth of grid leak and it stresses the output transformer quite a bit and it doesnt even sound useable.

I thought..hey lets try to build one from transistors..then I quickly realised my brain isnt really up to that task. I am not trying to fully replicate the vacuum tube in its characteristics and so on. Im just trying to replace a vacuum tube that skyrocketed in price (i wont buy a 30 dollar tube to put it into my 20 dollar radio...unacceptable).

The triode section of the ECL86 isnt all that bad to replicate with two Jfets, but the beam tetrode is another story. Reallistically with semiconductors I wouldnt need any other grids so it could act like a triode but it being a 9W (Total power dissapation).

I would want this to be a drop in replacement so no mods to the radio done. I just need it close enough so it will work and isnt a crappy solution.

Anyone has any ideas how could I tackle this thing?

rsjsouza:
There are zillions of solid state replacements for rectifiers - they are quite easy to make.
 
More complex vaccuum tubes, however are a bit more involving but they do exist. I have a few PCL82 solid state "vacuum tubes" in my collection. The circuit is very simple but I didn't extract it - I am pretty sure someone on the internet already has this.

Ah, I found something: https://www.antiqueradios.com/forums/viewtopic.php?f=1&t=302235

rsjsouza:
Ah, found them. Actually they are PL802 (simpler, single function). The power FET is a BF459.

SK_Caterpilar_SK:
Dangit a PCL82 solid state would be quite close to what I need

KE5FX:
Amusingly, the answer to this question is literally "Yes."  Not something you'd normally find in a tube radio, though.

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