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SHV triode

So I'm looking at a patent (US 4,648,093 to Sasnett et al.) that has an interesting pulse circuit for driving CO2 lasers. It's sort of a combination boost converter and trigger circuit, quite clever.

The controller is a plain-vanill BJT current source cascoded with a triode, and it's the triode I'm mostly interested in. It needs to handle over 20 kV and 600 mA peak current.

They didn't put that kind in the Receiving Tube Manuals that I have.

Any ideas what tube model that might be?

Cheers

Phil Hobbs

--
Dr Philip C D Hobbs 
Principal Consultant 
ElectroOptical Innovations LLC 
Optics, Electro-optics, Photonics, Analog Electronics 

160 North State Road #203 
Briarcliff Manor NY 10510 

hobbs at electrooptical dot net 
http://electrooptical.net
Reply to
Phil Hobbs
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Dr. Hobbs,

Eimac, Email sent with actual part used.

Steve

Reply to
sroberts6328

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

Reply to
pcdhobbs

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,

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although it looks like most things in the 20kV range are several amps. Hmm, interesting.

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:

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Reply to
Tim Williams

Use good Soviet triode, comrade:

They is ~$50 on the eBay.

Reply to
bitrex

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

--

John Larkin         Highland Technology, Inc 
picosecond timing   precision measurement  

jlarkin att highlandtechnology dott com 
http://www.highlandtechnology.com
Reply to
John Larkin

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

Cheers

Phil Hobbs

Reply to
pcdhobbs

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

Reply to
sroberts6328

There is a video of something similar here:

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Reply to
Chris Jones

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.

Reply to
Robert Baer

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).

--

-TV
Reply to
Tauno Voipio

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

John

Reply to
jrwalliker

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

--
Dr Philip C D Hobbs 
Principal Consultant 
ElectroOptical Innovations LLC 
Optics, Electro-optics, Photonics, Analog Electronics 

160 North State Road #203 
Briarcliff Manor NY 10510 

hobbs at electrooptical dot net 
http://electrooptical.net
Reply to
Phil Hobbs

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