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@hotmail.com
http://www.jamesburgdish.org
Jamesburg Earth Station Moon Bounce Team
http://www.cq-vhf.com
From: "Robert Bonner" <rbonner@qro.com>
To: Karl-Arne Markström <sm0aom@telia.com>,<amps@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.Â
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@telia.com>
Sent 7/26/2007 11:21:50 AM
To: g3rzp@g3rzp.wanadoo.co.uk, amps@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@g3rzp.wanadoo.co.uk>
To: <amps@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@contesting.com
> http://lists.contesting.com/mailman/listinfo/amps
>
>
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