[Amps] 3CPX1500A7 Fil Voltage

[Rick Stealey]

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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