The Chinese and Japanese often have clones of EU TV tubes.
Carl
KM1H
----- Original Message -----
From: "Patrick Barthelow" <apolloeme@live.com>
To: <amps@contesting.com>
Sent: Thursday, March 01, 2012 11:18 AM
Subject: [Amps] 432 Cavity Amps; Thomson TH 331
>
>
>
> Friends,
>
> After being offered for free, a Working Pull complete Tetrode cavity TV
> amplifier on 470mhz, (Sans power supplies which would have to be built)
> and with possible plans to make a moonbounce Amp, I checked on
> Pricing/Availability of spares, specifically the Thomson TH 331 power
> tube. The Amp is capable of operation far above the legal limit; ~ 7.5KW,
> so I wanted to know if it is easy to run at a reduced 1500 watts out.
>
> Then I would be more comfortable with a Spare Tube around, and checked a
> vendor to find that the Large Thomson TH 331 is no longer made, and the
> vendor could find no equivelant tube, that was still made. A surprise to
> me also was the last price list with the tube, in 2006 showed a price of
> $8700 list, ea. Ouch.
>
> My question is, It it possible to find a similar power tube to with
> matching Critical Anode, and other dimensions that will swap into the
> matching cavity system, and make cavity tuning changes to accommodate
> different tube RF circuit requirements? Or... maybe impossible with new
> replacement tube. Perhaps a lot of TH 331s are out there used?
>
> If this is not practical to use/modify for Amateur radio Moonbounce use,
> it is likely to be donated to a Large Dish installation for their use. I
> am guessing interplanetary radar use. Is 7.5 KW output at 432, useful in,
> say Moon Radar mapping studies?
>
> Here are photos of the tube, and Cavity cabinet:
> https://skydrive.live.com/?cid=2eb5c45df634a712#cid=2EB5C45DF634A712&id=2EB5C45DF634A712%21783
>
>
> 73, Best Regards, AA6EG, Pat Barthelow
>
>
>
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