There is a brief story of the ARC-5/SCR-274 command set evolution,
with emphasis on the VHF units, in the document
http://www.scr-274-n.info/css.pdf
from CQ November 1964.
Nothing specific was however said about the 1625 and 1626.
73/
Karl-Arne
SM0AOM
----- Original Message -----
From: "jeremy-ca" <km1h@jeremy.mv.com>
To: "k7fm" <k7fm@teleport.com>; <amps@contesting.com>
Sent: Tuesday, August 07, 2007 7:19 PM
Subject: Re: [Amps] 1625SS
> Somewhere in my archives (the one between my ears) I remember reading that
> the ARC -5/SCR series of transmitters were designed in the mid 30's (1937
> comes to mind). It wouldnt have been in QST of the era I'm sure but
> someplace that had a history of the TX and RX used in WW2.
>
> With RCA announcing the 1625 in 2/41 QST it was already anticipated that the
> US would be entering the war and we were already providing fighter aircraft
> to Britain by way of Canada such as the P38 which started production in 1939
> and had the ARC-5.
>
> Carl
> KM1H
>
>
> ----- Original Message -----
> From: "k7fm" <k7fm@teleport.com>
> To: <amps@contesting.com>
> Sent: Tuesday, August 07, 2007 9:40 AM
> Subject: [Amps] 1625SS
>
>
> >A few weeks ago, there was some discussion of the 1625. I started
> >reviewing
> > my old QST magazines (my wife thinks keeping them on the book shelf is a
> > waste of space) and found a tube announcement for the 1625. It took
> > awhile,
> > because I got sidetracked by the many other articles and ads. Well, I did
> > not find the 1625 tube.
> >
> > Last night I brought home a real treasure - a newly purchased
> > Hallicrafters
> > S-30, a very rare radio direction finder. I was looking through the same
> > QSTs to find an ad that showed a photo of the external power supply and
> > finally found a birth announcement for the 1625. It is in QST, February
> > 1941. The announcement simply says that "the type 1625 is similar to the
> > type 807 except that it is provided with a 12.6 volt heater and a 7-pin
> > base." So, the information adds little except a time frame. More useful,
> > though, may be the announcement of the 1626 in the same article. This is
> > much more unique. It is designed for rf oscillator service "requiring
> > unusual stability". It is a new design and not a copy of one of the 6
> > volt
> > tubes. If you carefully examine the sequencing and timeing of the 16XX
> > series tubes, you will find that they were released to solve a special
> > need.
> > It was not simply a 12 volt series of tubes. For example, the 1624 2.5
> > volt
> > filament, as I recall. I expect the 1625 and 1626 were designed by RCA to
> > meet specifications for a particular transmitter series. I would guess
> > that
> > soon after, the 1629 was released. It is almost as if these tubes were
> > designed to meet the specifications set forth by the designers of the
> > ARC-5.
> >
> > Well, back to work so I can finish the 1941 QST binder before work.
> >
> > 73, Colin K7FM
> >
> > _______________________________________________
> > Amps mailing list
> > Amps@contesting.com
> > http://lists.contesting.com/mailman/listinfo/amps
> >
>
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