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.
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.
>
>
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