[Johnson] A question from A New BA operator.

Thu, 21 Mar 2002 09:12:55 -0500

In the "real old days" when Novices were limitied to 75 watts input
(remember when power was measured by input to the final, not output?) it
was common to pull one of the 6146's out of DX-100's or two of the
6146's out of the Valiant to allow the novice to operate these
transmitters (with crystals of course) at the power range they were
limited to. This was an incentive for novices to buy the high power rigs
before they were allowed to use them at thier full capability. Then when
they upgraded to General, they could just pop the tubes back in and run
normal power. Remember the DX-60? It advertised a 90 watt input, but
there was a warning that for Novice use, you had to load it so that only
75 watts was input, not 90 (as if anyone on the other end could tell the
difference between 75 and 90 watts).

Another thought, and I haven't tried this, is to load the Valiant up to
full power (330ma for AM, 450ma for CW), peak the grid then back off the
grid drive (normally 8ma) until you get the power level you want.

73, Ray  W2EC  

"Guy Olinger, K2AV" wrote:
> 
> Correct. Run it at specs.
> 
> The plate voltage is fixed, the screen voltage is fixed, the L/C
> ratio's in the tank circuit are only partly variable since the L being
> used on a given band is fixed. The whole shebang is at maximum
> efficiency at the specified settings.
> 
> I've seen guys operate a Valiant AM until the cows came home. Just
> don't drop a book on the mike switch and get up and leave. When your
> voice starts to hurt let the other guy transmit :>)
> 
> ----- Original Message -----
> From: "Dr. Clifford L. Coleman" <[email protected]>
> To: <[email protected]>
> Sent: Wednesday, March 20, 2002 4:23 PM
> Subject: Re: [Johnson] A question from A New BA operator.
> 
> > While restoring my valiant, I found(as the manual suggests ) that
> less
> > loaded causes high modulator current-so I tune it up to full power.
> cliff
> > k9jts
> > ----- Original Message -----
> > From: "Mullin, Edward J." <[email protected]>
> > To: <[email protected]>
> > Sent: Wednesday, March 20, 2002 1:40 PM
> > Subject: [Johnson] A question from A New BA operator.
> >
> >
> > > Hello All,
> > >
> > > I've been lurking on this mail list for a while, as I've been
> > > working on my Valiant.  So far I have gotten it working again,
> (recapping
> > > and replacing a couple of tubes was all it needed:)   Now I want
> to use it
> > > on the air.  (I've been testing into a dummy load during
> restoration). I'm
> > > new to BA's (and Ham operations) in general, and  I've been
> reading the
> > > manuals alot.  What I want to know is: What is the correct method
> for
> > > transmitting at less than full power. The manual is good at
> describing the
> > > tuning process, but it doesn't really cover this information.(at
> least I
> > > didn't figure out where it was.)
> > >
> > >
> > > 73 de KB1HYS
> > >
> > >
> > > > Edward Mullin
> > > >
> > > >
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> > > http://mailman.qth.net/mailman/listinfo/johnson
> >
> >
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> 
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