Possibly, but 7.08v is definitely low for a 7.5v filament.
On Feb 19, 2005, at 11:14 AM, 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
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>>
>>
>
>
>
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>
Richard L. Measures, AG6K, 805.386.3734. www.somis.org
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