John E. Cleeve wrote:
> I discovered that
> Pin 1, on each 3-500Z tube, had become overheated, the solder between the
> pin sleeve and the tungsten wire from the tube envelope, had melted /
> carbonised
Something to keep in mind is that, in addition to insufficient cooling,
one cause of this can be weakened clips in the tube socket, causing poor
electrical contact. The pin gets hot, which may actually weaken the
clip further, and ultimately the solder melts. So it's worth checking
the condition of the tube socket.
--
73,
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco
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