------------ ORIGINAL MESSAGE ------------(may be snipped)
On Mon, 10 Apr 2017 01:54:42 +0000 (UTC), Catherine wrote:
>My SB-220 still has Eimac tubes in it. I suspect they are the 40 year-old
>originals, though I cannot prove it. Tubes should last a very long time in
>routine amateur service.
REPLY:
Tubes are notorious for becoming gassy due to air leaks and for
internal arcing, neither of which transistors do.
There is a reason tubes plug into sockets instead of being hard wired
like transistors. Take a guess.
73, Bill W6WRT
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