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@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@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 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@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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>
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