SHV triode

Dr. Hobbs,

Eimac, Email sent with actual part used.

Steve

Hi, Steve,

Thanks! Did you work with Mike Sasnett? I think he was a student of the late great Tony Siegman at Ginzton, but before my time.

Cheers

Phil Hobbs

If it's pulsed, they made radar modulator tubes (mostly tetrodes) with comparable ratings. Though usually more like 10kV and 5Apk.

A flip through Eimac's catalog should drop some clues,

Maybe it was an older type then -- the classic transmitter tubes always seem to go with silly high impedances (like 10-20k ohms). Dunno!

Tim

-- Seven Transistor Labs, LLC Electrical Engineering Consultation and Contract Design Website:

Use good Soviet triode, comrade:

They is ~$50 on the eBay.

That's going to be a big expensive jug. Can you do it with mosfets?

Fortunately I don't need to build it, just analyze it. (It's prior art in a patent case.)

Cheers

Phil Hobbs

Eimac 3z-400 and 3z-500 ran grounded grid in the flowing gas CO2 medical lasers I've worked on or scrapped in tbe late 90s. Two vacuun tubes per laser, because the laser tube had a central anode and a cathode at each end of the laser plasma tube.

Steve

There is a video of something similar here:

Wild guess maybe one of those Eimac high power tubes the hams use..like the (numbers from blue sky) 3-500, 3CX3000, 4CX250. There has gotta be data sheets on the monsters you may use.

The voltage exceeds the maximum of most reasonably-sized transmitting tubes, e.g. for Eimac 3-1000Z the limit is 6kV.

Your instantaneous power will be pretty hefty, around 12 kW, but what decides is the average power and maximum cathode emission.

If you do not need the transmission-line properties of the external- anode tubes (from 4x150 up), I'd stay away from them due to the fragile handling properties and poisonous ceramic insulation (BeO2).

The X-ray emission could be significant during switching transitions.

John

Fortunately I don't need to worry about that--I just heard that we beat Google/Waymo on the patent case, so I'm off the hook. (Fun stuff but a very very intense schedule.) Good for the CV, though.

Cheers

Phil Hobbs