In amp that uses 3cx800a7's, is there any way to determine if one of a pair
(or more) has gone south other than by simply replacing it to "make sure?"
What I did (and this may be wrong as all get-out) was take a Raytek laser
thermometer and read the temp of the tube on the exposed plate area.
What I found is there was only a 7 degree F. difference between the two, 128
deg and 135 deg. Not very scientific but... at least I know there is something
goin on inside that sealed envelope to indicate to me that the electrons are
swapping places at a pretty good clip to generate lots or RF.
If there might be a better way other than pay many $$$.$$ to have them checked
by the manufacturer, I would like to hear about that method.
73
Gary
WA6FGI
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