Regarding 8877 tube life, I can tell you that in my working
days we ran an 8877 amp at 250 watts output 24/7 for 15
years, without ever changing the tube. The amp was
transmitting IRIG-B time code on VHF for synchronization of
all instrumentation on a test range.
We finally switched to a solid state amp. The old amp is
now owned by a ham in Colorado, on moonbounce, using the
same tube.
Dave Hachadorian, K6LL
Yuma, AZ
.
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