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Re: [Amps] 3-1000Z Filament Voltage Question

Subject: Re: [Amps] 3-1000Z Filament Voltage Question
From: Jan Erik Holm <sm2ekm@telia.com>
Date: Sat, 19 Feb 2005 20:31:24 +0100
List-post: <mailto:amps@contesting.com>
0.007 percent out of spec. Measured on what? When
was your instrument calibrated last time?

73 SM2EKM

--------------------------------------------------



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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