Greetings,
I have a Harris RF-104 with a 3-1000Z tube. I have several questions regarding
the filament voltage.
The Eimac spec. sheet that I have lists the filament voltage as a nominal value
of 7.5 volts with no min or max values
shown (unlike the 3-500Z spec. sheet which has min/max values). The Harris
RF-104 that houses and powers the
tube has a spec. of 7.8 volts. As I've had to adjust the filament transformer
taps to achieve 7.8 volts (due to different
line voltage here), I was wondering if:
1. There a preferred voltage to run the filament at?
2. There a loss of tube life running the filament voltage too low or high?
3. There a practical tolerance for the filament voltage?
Any information would be appreciated.
... 73
Rob Brennen VE6TR
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