General > General Technical Chat

Solid-State TUBES !!

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GlennSprigg:
A lot of places are now developing Solid State 'Tubes', although with no need for a vacuum inside.
We are not talking about modified circuitry to change over to semiconductor equivalent circuits, but a solid state construction that is inside of a glass envelope, (for looks), and with the standard 'Tube' BASE, that just plugs right in to replace the original tube!!  Of course there will be the arguments about purity/quality of sound, (for true valves), but these just plug right in to the original socket, as a replacement!
"Bones of contention" expected... Need a light globe inside, to look like a Filament!!   8)


--- End quote ---

frozenfrogz:

--- Quote from: GlennSprigg on April 12, 2020, 01:19:18 pm ---A lot of places are now developing Solid State 'Tubes', although with no need for a vacuum inside.

--- End quote ---


Please define "a lot of places" and "now".

A several years ago some of those solid state 12AX7 / ECC83 retrofits have been on the market, AMT being one of the more prominent manufacturers.
https://amt-sales.com/other/tubes/amt-12ax7-warm-stone-tube/

However, in the past couple of years (3-5?) I was not able to track down anything on the market.
I would have been interested in buying a couple of these to knock down the current consumption of the +15VDC rails in several Ampeg SVT 7 pro amplifiers (pretty buggy designed). These are solid state Class D amplifiers with a single 12AX7 in the preamp stage. Getting rid of the heater current by replacing the valve with one of those solid state retrofits would have saved me a lot of trouble.

Gyro:
Look up 'Fetrons', they were manufactured over 50 years ago!  ;)

Cyberdragon:
I hate these things, t throw em away if I see em in anything.

Get your damn trannies outta my shit. >:D

TimFox:
I remember when the Fetrons first came out.  One was a cascode device to replace 6AK5/5654 pentodes, which were extremely common in military RF devices.

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