[Amps] Gassy Tubes/Technology Museum looking for artifacts

[Pat Barthelow]

I found a great series of GPO books covering the WWII era, Signal Corps, in 
all its aspects, particularly the trials and tribulations of spooling up, 
producing the huge amount of telecom technology hardware demanded by the 
war.   After reading these books, I will never again see iin the same light, 
any components from that era, particularly tihings like the ARC -5s, and 
Johnson and Hammarlund air variable capacitors, trimmers, etc...had no idea 
of the heroic efforts needed and taken to design and produce in the 
quantities needed, what we see as boat anchors in flea markets, or still see 
in our homebrew high power amplifiers.
Here is some info on the books which you can get at the Government Printing 
office:

I have the 2nd of 3 volumes.  You can probably get them from the Govt 
Printing office for reasonable cost..  (866) 512-1800
Really good reading....
Called :
The Signal Corps:
The Test Dec 1941-July 1943
By:
Geroge Thompson
Dixie R. Harris
Pauline M Oaks
Dulany Terrett

Center of Military History
United States Army
Washington DC
CMH Pub 10-17

Other Volumes:
1. The Emergency
2. The Test  (This one)
3. The Outcome

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

>From: "Robert Bonner" <rbonner at qro.com>
>To: Karl-Arne Markström <sm0aom at telia.com>,<amps at contesting.com>
>Subject: Re: [Amps] Gassy Tubes/Technology Museum looking for artifacts
>Date: Thu, 26 Jul 2007 20:10:26 GMT
>
>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 
>impossible.
>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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