[Amps] Gassy Tubes/Technology Museum looking for artifacts

Thu Jul 26 16:56:32 EDT 2007

I guess Radio Ops  on the ground on Tinian or Guadalcanal, Wake or Midway,  
mustering their big wing of B-17s/B-24s doing pre mission radio checks on 
the ground with the aircraft fleet, were often in in 110 degree heat.  In 
the air, everybody still had to be/stay on the same frequency at altitude 
where it might be -40 degrees F ambient.  The VFOs and crystals HAD to be 
stable, and/or the radio ops had great skills in tuning, keeping on the 
right freq...Someone should/should have interviewed guys that were there, to 
get their stories from a signal corpsman perspective, and write/written a 
book.

Sincerely, Pat Barthelow     aa6eg at hotmail.com
http://www.jamesburgdish.org
Jamesburg Earth Station  Moon Bounce Team
http://www.cq-vhf.com

>From: TexasRF at aol.com
>To: rbonner at qro.com, sm0aom at telia.com, amps at contesting.com
>Subject: Re: [Amps] Gassy Tubes/Technology Museum looking for artifacts
>Date: Thu, 26 Jul 2007 16:35:59 EDT
>
>
>Have you ever measured the frequency stability of one of those old Command
>set/ARC 5 transmitters? I did many years ago and the stability was just
>phenomenally excellent. No wonder some of the early ssb transmitters were 
>based  on
>those units.
>
>Gerald K5GW
>
>
>
>
>
>In a message dated 7/26/2007 3:10:32 P.M. Central Daylight Time,
>rbonner at qro.com writes:
>
>So WWII  ends in 1945 and I become a ham in 1971.  I buy a brand new ARC-5
>transmitter in the box for $15 from the surplus place.
>I just recently on  eBay saw another new ARC-5 still in the box for sale.
>This stuff is  still out there.  Think about it, the 8th air force was 
>losing
>25% of its  flight per day over Germany.  Aircraft Radio Company probably 
>was in
>warp  service building bomber radios to keep the new planes plus radios
>getting shot  up in the air...  The final war end and the production 
>overflow was
>enough to have 100 radios sitting on the shelf at this ONE SURPLUS joint in
>Minneapolis still in 1971.  Not to mention receivers and all the other  
>gear.
>There must have been 25,000 sitting somewhere at one  time.
>Looking back I should have bought complete systems for the collection  
>aspect
>of it.
>There's nothing like opening a brand new radio from the box,  where it was
>built in 2007 or 1945.
>BOB DD
>When they finally built  ARC-5's and the rest of the racks
>-----Original Message-----
>From:  "Karl-Arne Markström" <sm0aom at telia.com>
>Sent 7/26/2007 11:21:50  AM
>To: g3rzp at g3rzp.wanadoo.co.uk, amps at contesting.com
>Subject: Re:  [Amps] Gassy Tubes/Technology Museum looking for artifactsIt 
>is
>very likely  that the 1625 was war-time development to accommodate the 28 V
>system  voltage in larger aircraft. The 1625 is not listed in my RCA TT-3
>from  1940,
>so it must have been introduced  later. A German tube history  site
>http://www.jogis-roehrenbude.de/EL34-Story/6L6-Story.htm lists the
>introduction date as
>September 1943, which seems somewhat late in the  war.
>It seems reasonable that the change to a 7-pin base was derived  from
>logistics reasons, so any mixing-up the 807 and 1625 should have been  
>impossi
>ble.
>After the war the surplus 1625 was probably one of the cheapest  RF power
>tubes around.
>Swedish surplus ads described the 1625 as "double  filament voltage and 
>half
>the price" compared
>to the 807.
>The 1625 came  to influence the power-tube markets long after after the 
>war.
>Philips made  a special version of their 807 competitor, the PE 06/40, 
>using
>the same  filament ratings and
>base as the 1625. It was nomenclatured as PE 06/40 E,  and was produced 
>well
>into the sixties.
>73/
>Karl-Arne
>SM0AOM
>-----  Original Message -----
>From: "Peter Chadwick"  <g3rzp at g3rzp.wanadoo.co.uk>
>To: <amps at contesting.com>
>Sent:  Thursday, July 26, 2007 4:22 PM
>Subject: Re: [Amps] Gassy Tubes/Technology  Museum looking for artifacts
> > Does anyone know why the 1625 got a  different base to the 807? I read
>somewhere it was developed for ARC for the  Command transmitter, (just as 
>the 12A6
>was developed for the receiver) but  there doesn't appear an inherent 
>reason
>why the base was changed.
> >  73
> > Peter G3RZP
> >  _______________________________________________
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> > Amps at contesting.com
> >  http://lists.contesting.com/mailman/listinfo/amps
> >
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