Well..you guys can suit yourselves but...
Did the AC4 just sit there running filaments or were you running it with
a 50% key-down 300ma load on it for hours on end?
Ask the RTTY contest guys how warm they get.
Sure they stay cooler outside the MS4. Cool enough? Having serviced
commercial, amateur and industrial electronics for over 40 years, I can
tell you, without hesitation, that the cooler this stuff runs, the
longer it will last.
BTW..I have owned an original AC4 since 1966 and it is still fine. I
have replaced the guts with one of the upgrade boards but think the cost
of fan is good insurance so I never have to find out how long they will
actually last.
Also BTW...anyone that suggests that you blow air INTO a box to cool it
does not understand the dynamics of the problem.
My original T4x is also still fine, but I put a fan on the final cage of
that unit. Lets see...a pair of finals cost a little less than a power
transformer last time I checked.
Suit yourselves..
Curt
KU8L
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