>What is his AC line voltage?
>Did anyone fool around with filament taps?
>
>Normal filament voltage at 240 VAC is 7.5 VAC. this I measured on MY 3K
>PREMIER.
? He apparently does not own a Henry 3K Premier, Dan.
>
>73, Dan Magro W7RF, (President WARC 1999, member SCDXC, SCCC)
>Manufacturers Rep & Distributor for HENRY RF Power Amplifiers.
>RF Applications Power Measuring equipment, See the VFD & WinWatt!
>www.radiodan.com <http://www.radiodan.com> RFpower@radiodan.com
><mailto:RFpower@radiodan.com> A trip to our web site is worth the click!
>
>
>
>
>> -----Original Message-----
>> From: owner-amps@contesting.com [mailto:owner-amps@contesting.com]On
>> Behalf Of measures
>> Sent: Sunday, November 21, 1999 10:41 PM
>> To: Richard A. Hernandez; AMPS
>> Subject: [AMPS] Re: 3CX1200A7 Filament voltage
>>
>>
>>
>> >Hi Rich,
>>
>> ditto
>>
>> >My Henry 3K classic X MK II which runs the 3CX1200A7 is showing a
>> >filament voltage of 7.97 volts on my Fluke multimeter. I read in
>> a "general
>> >characteristics" page for the 3CX1200A7 that the filament
>> voltage should be
>> >7.5 volts +/- 0.37 V. Should I be concerned about this? Am I running too
>> >high a filament voltage?
>> > Rich.
>> >.......
>> Rich -- For maximum emissive life, the filament potential of a 3CX1200A7
>> should be kept around 7.13v. According to Eimac, emissive life is a
>> function of (e1/e2) ^23.4 = [(7.13v/7.89v)^23.4] . In other words,
>> emissive life in your 3K Classic will be around 7.4% of normal, unless
>> you modify the amplifier. I would be concerned about loosing over 90% of
>> the emissive life because of an error in filament potential.
>> >
>> cheers.
>> >
>>
>>
>> - Rich..., 805.386.3734, www.vcnet.com/measures.
>>
>>
>> --
>> FAQ on WWW: http://www.contesting.com/ampsfaq.html
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>>
>>
>
>
- Rich..., 805.386.3734, www.vcnet.com/measures.
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