I just purchased and installed a Chinese-made graphite anode version
of the 3-500Z for my trusty old Heathkit SB-1000. The original Eimac
tube had gotten gassy after sitting around unused for six or seven
years. Made quite a light show when powered up.
The new tube seems to be working fine - the only difference I notice
is the anode is much more massive than the Eimac metal-anode version,
and therefore heats up and cools down much more slowly.
I'm just curious about the background of graphite anodes. Does anyone
know how they came to be used in place of metal? Perhaps because a
momentary overload would be less likely to damage the anode? Any
information would be appreciated.
73, Bill W7TI
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