>
>Well, I resoldered the pin yet again and thoroughly polished the filament
>pins, and so far the repair seems to be holding. The socket seems to be
>reasonably tight on the filament pins, so I hope it's not socket
>replacement time yet.
>
To tighten the clip spring, slide it off, bend a bit, and snap it back
on. Even though a socket feels tight when unplugging/plugging a tube,
one pin could still be not tight. A good way to check a socket for
tightness is with a single 3-500Z pin soldered to 4 or so inches of #10
Cu wire, one pin at a time.
,
>This raises a question, though -- I had assumed that the main source of the
>heat that melts the pins was heat dissipated inside the tube element. Now
>I'm wondering whether it may not be simple resistive heating from imperfect
>contact between the pins and the socket. Anyone have a view on which
>effect predominates?
>
Filament power alone gets pins 1 and 5 hot enough to melt solder,
sans-forced air cooling.
>I also notice that my amp seems to breathe a LOT better with the case off
>(but the cage and deflector plate in place, of course. A foot away from
>the top of the cage I can feel a nice breeze. Perhaps I should just leave
>it this way (without the outer case) for contest use. comments?
Without obstructions, the stock 220 air cooling is enough for all except
berserko 11m speech processing -- provided the fan motor is
periodically oiled.
>
cheers, Pete
- R. L. Measures, 805.386.3734, AG6K, www.vcnet.com/measures.
end
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