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I cut my teeth bringing an old Johnson Thunderbolt back from the grave.
(2) 4-400A tetrodes in parallel....learned a lot.

Key to that whole applicaiton is the neutralization....and the fact
if the gains of the tubes are so far off theres not really a perfect way to neutralize,
merely adjust the cap for "best effect" so there is no self osc, and max power out.

I believe ALL the RF transmitting tubes on the market are now made in Chyna,
and they always mass produce with sub-par materials from a "copied" sample
to cut their expenses as much as possible.

They seem to be also renumbering some tubes as "High performance",
merely giving the same tube a different part number with higher price
meanwhile theres no history of that part number tube or a datasheet.

--
Steve Hearns [ KA2PTE ]
Technotronic Dimensions, VT [USA]
WWW.TECHNOTRONIC-DIMENSIONS.COM
E-Mail: Steve@...