[AMRadio] 75A2

[AirRadio]

Reading this makes me think of my own experiences, I have an 837 tube for my 
ART-13, the tube is brand new, I fitted it into the transmitter when the 
filament failed on the previous one, it did not work, I tested it on the 
tube tester, 100% within all perameters, checked it back in the rig, no go, 
I tested the rig thinking there was more to the filament breaing than met 
the eye, all present and correct, found another 837 and fitted it, perfect, 
no reason why, just goes to show tube checkers only give a certain idea of 
tube characteristics, not necessarily letting you know if they do the job or 
not.
73 Max M0GHQ