Doubt you'd need ALC, the Mark I and Mark II were both hard to drive. If
you have a 940S/AT with the internal ATU, you'll probably need to use that
ATU to be able to fully drive either a Mark I or a Mark II, and even then
might not be able to drive it fully -- these amps are from the "tube
transceiver" days and really mated well to rigs like the Swan 350 and 500
which ran ~150W PEP output power, some 50% more than the TS940.
As I recall, the Mark I had everything in one large box (RF section and
power supply) and ran heavy and hot. The Mark II, I believe, separated the
RF section from the power supply, cooled them with two separate fans, and
contained other minor improvements. I think they were designed for
3-400Z's, which were squatter than 3-500Z's, and required some modification
to use the modern-day 500Z's (both mechanically and electrically, since the
400Z's were "zero bias" I think, and the 500Z's require a few +V on their
cathodes to kick them into the zone).
73, Steve WB2WIK/6
"Each success only buys an admission ticket to a more difficult problem." --
Henry Kissinger
> -----Original Message-----
> From: Dale smith [SMTP:newday@metrocast.net]
> Sent: Wednesday, November 14, 2001 4:28 PM
> To: amps@contesting.com
> Subject: [AMPS] swan mark-2
>
>
> Hi Folks
> Its me again i have never used a amp before so i am new at this.1st
> of
> all let me thank everyone who responded to my prior question.Still
> concerned
> abt interfacing this swan mark-1 to the knwd 940.
> Is the keying in the amp negitive or positive ?How much voltage,Could
> i
> try the amp by using a foot switch to key it.Key the amp first.Ameitron
> makes a interface but that is for positive keying.How abt tuned input and
> alc circuits.Dumb questions i suppose,anyways,tnx in advance..de
> Dale..KA5WHO in NH
>
>
> --
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