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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