> >
> >Hi Rich,
> >
>
> >
> >On many rigs the RF out control is too close to other controls and could
> be
> >easily bumped into the "gee, I wonder what vaporized the grids in my $400
> >8874's?" position.
> >
> Autopsy shows that the 8874 grid is not damaged by overdrive. The damage
> is to the cathode's emissive coating - which flakes and shorts the grid.
> /photo of flaked cathode in "Parasitics Revisited", Sept/Oct 1990
> *QST*./
[Steve Katz] Well, whatever! I only know the cost of 8874's
currently sucks and it doesn't seem to be decreasing, so short of replacing
them with something else (a serious possibility), I try to take care of
them...have had one set in one amp for 15 years and still working fine.
> cheers, Steve
[Steve Katz] 73!
> >
> >> -----Original Message-----
> >> From: 2 [SMTP:2@vc.net]
> >> Sent: Monday, December 03, 2001 10:08 AM
> >> To: Steve Katz; 'jbrown@luminet.net'; AMPS
> >> Subject: RE: [AMPS] Alpha 374A
> >>
> >> >
> >> >We use that combo among others at my contest station, K2XR
> (1000MP/374A)
> >> and
> >> >there's nothing to do to set it up except attach the coax from the rig
> to
> >> >the amplifier...
> >> >
> >> >The 374A has untuned input and a large resistive swamping network at
> the
> >> >input, I'd leave that in place for the 1000MP, to prevent overdrive.
> >>
> >> Does the 1000MP lack an RF outout control?
> >>
> >> - R. L. Measures, 805.386.3734,AG6K, www.vcnet.com/measures.
> >> end
> >
> >--
> >FAQ on WWW: http://www.contesting.com/FAQ/amps
> >Submissions: amps@contesting.com
> >Administrative requests: amps-REQUEST@contesting.com
> >Problems: owner-amps@contesting.com
> >
> >
>
>
> - R. L. Measures, 805.386.3734,AG6K, www.vcnet.com/measures.
> end
--
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