[Amps] New Amplifier

[Bill Turner]

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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