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piglet piglet is offline
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Default A solid state replacement for the lowly 2D21 Thyratrontube...(sorry for the On-Topic post!)

On 22/04/2021 5:00 am, bitrex wrote:

There's this patent from '66 that describes a solid-state thyratron

It uses a couple of SCRs. It's to replace high-power thyratrons but I
don't see why it couldn't be scaled-down.

Thanks Bitrex, that patent even mentions a tunnel diode and UJT which
are now very exotic devices. The struggle was to emulate the high
impedance thyratron grid. It seems to me (I have never seen a thyratron)
that a modern depletion mode mosfet would make a good front-end to a SCR
in that a negative grid bias is required to keep the device
non-conducting (if I understand thyratrons correctly).

Here is a conceptual sketch:

Possible fets could be BSS126 or LND150 and SCR with sensitive gates
X0402NF or BT149G.