At 06:32 AM 12/10/03 -0800, Joe Isabella wrote:
In my amp, when I transmit (espeically in the typical long-winded 350W
carrier AM transmission),
my RF Parts 3-500ZGs get quite red (almost orange). After 1 year of
pretty consistent use
(abuse??) like this, they still run full output.
I think the BIG difference between these and the sweep-tubes you reference
it is that they're just
not transmitter tubes and aren't built handle it.
I'm a little surprised to see this even being questioned. Every 3-500Z
I've ever seen has been cherry red or brighter at key-down rated
output. The ones in my SB-220 are at least 10, more likely 20 years old,
and still deliver near-rated output in heavy contesting service. On the
other hand, the only time I ever saw a sweep tube go red was right before
the tube envelope melted on my old FTDX-560.
73, Pete N4ZR
Happy Holidays
Check out the World HF Contest Station Database at
www.pvrc.org/wcsd/wcsdsearch.htm
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