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Re: [Amps] 1625SS

To: "k7fm" <>, <>
Subject: Re: [Amps] 1625SS
From: "jeremy-ca" <>
Date: Tue, 7 Aug 2007 13:19:23 -0400
List-post: <>
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.


----- Original Message ----- 
From: "k7fm" <>
To: <>
Sent: Tuesday, August 07, 2007 9:40 AM
Subject: [Amps] 1625SS

>A few weeks ago, there was some discussion of the 1625.  I started 
> 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
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