"Richard Harrison" wrote
I`d design for a conjugate match at the rated load and include overload
protection for an output short circuit or near short. For solid-state
I`d provide overvoltage protection.in addition to overcurrent
protection.

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To obtain a conjugate match it is first necessary to know what the source
impedamce is. How or from where is that elusive figure obtained?

It is not given in a transmitting tube manufacturer's data sheets. Perhaps
it doesn't matter what it is - not needed?
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Reg, G4FGQ