[AMRadio] Viking II Power Mod

[Dennis Gilliam]

RCA says 50W per tube in class "B" linear CCS, 70 per in ICAS.  Max Ep in
that service is 2.25kV.  Not a lot for your investment...

73DG

On Thu, Oct 20, 2011 at 11:28 AM, W6OM <w6om at cox.net> wrote:

> Thanks Eddy
>
> Interesting point. 3 X 813's at 2800V and 500 ma delivers a lot more than
> 180 watts if the 813 spec sheet is accurate.
>
> It's just a hunch but I think I'll give it a try anyway, if not workable I
> will just build a big 8 -10 db attenuator.
>
> Thanks again for your thoughts, that is what I was looking for.
>
> Ron W6OM
>
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> ----- Original Message -----
> From: "Eddy Swynar" <deswynar at xplornet.ca>
> To: "Mel Farrer" <farrerfolks at yahoo.com>; "Discussion of AM Radio in the
> Amateur Service" <amradio at mailman.qth.net>
> Sent: Thursday, October 20, 2011 10:30 AM
> Subject: Re: [AMRadio] Viking II Power Mod
>
>
> > Hi Ron,
> >
> >>
> >> Greetings everyone.  I have a simple question concerning my old Viking
> >> II.   I am just finishing up a 3 X 813 linear and need to consider how
> to
> >> drive it with the Viking II.
> >>
> >
> > I don't think it'd be worth your while to even bother...
> >
> > Consider the math: three 813s would give you, what, some 180-watts of
> > carrier output as an AM linear, right? Well, you're probably already
> > getting 100-watts of carrier output from that V2 as it stands now. The
> > difference would be a mere 80-watts with the 813s, not even twice what
> the
> > V2 is already giving you...
> >
> > And keep in mind, that for a 3 db. increase in signal strength, you'd
> need
> > to DOUBLE the power...and for a just perceptible increase in power, you'd
> > need at least a 6 db. increase.
> >
> > It just ain't worth the effort, IMHO...
> >
> > ~73~ de Eddy VE3CUI - VE3XZ
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