[Amps] 3-1000Z Filament Voltage Question

[Jan Erik Holm]

0.007 percent out of spec. Measured on what? When
was your instrument calibrated last time?

73 SM2EKM

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Gary Schafer wrote:

> Your meter calibration is probably off that far unless you have a very 
> good one.
> 
> 73
> Gary K4FMX
> 
> Dennis Sokol wrote:
> 
>>I have a BTI LK-2000 using a 3-1000Z operating on 160. I can get 1250 watts out with 2700 volts and 750 ma key down. The tube seems to be limited in current draw. I have seen more power out at a different QTH with higher line voltage.
>>
>>I have measured the filament voltage at full load to be 7.08 volts.
>>This is a bit low from the spec of 7.13 to 7.87 volts. Is the low filament voltage a possible cause of reduced power out?
>>
>>There is a 208 volt tap on the filament xformer but I would have to put in a dropping resistor in the primary to bring the voltage down to 7.5 volts.  Is it worth the effort? Am I hurting the tube with the lower filament voltage or am I extending the life?
>>
>>Thanks and 73,
>>Dennis W0JX Milan, OH
>>_______________________________________________