>
>Commercial practice (I mean commercial transmitters, not commercially
>manufactured for amateurs) is often peculiar in this regard, depsite
>expenditure
>on thermal crayons and so on. My experience with tubes of 3-400, 3-500,
>4-250,
>4-400 ilk (they're all the same basic base and filament structure) is that
>blowing the filament seals directly with a small fan pays dividends.
>
>I believe Rich has also said that some force movement of air around the tank
>coil has advantages, too - which makes sense if you do a few sums.
>
? indeed. Contestors who own an amplifier with no tank cooling fan
would do well to borrow an IR thermometer and find out what's what prior
to the next contest. . .
cheers, Peter
- Rich..., 805.386.3734, www.vcnet.com/measures.
end
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