I'm using one of those tubes in my homebrew amp that I got from W1QJ. My
original tube was an 8877 and it arc'd. Louie provided the CPX tube, said it
was ok, and I set it at 5 volts on the filament and it runs smooth as silk.
Stable as a rock on all bands, legal limit out all bands. The only thing is
that 3 minute warmup which at times seems like 10 minutes! So even if it would
take 5.5 volts I don't see any reason to push it. Leave it at 5.0 and if you
get a little more line voltage you will have some margin of safety.
Rick K2XT
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