[Amps] Gassy Tubes/Technology Museum looking for artifacts

[Karl-Arne Markström]

It 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
> _______________________________________________
> Amps mailing list
> Amps at contesting.com
> http://lists.contesting.com/mailman/listinfo/amps
> 
> 
> -- 
> No virus found in this incoming message.
> Checked by AVG Free Edition. 
> Version: 7.5.476 / Virus Database: 269.10.20/919 - Release Date: 2007-07-26 09:56
> 
> 


-- 
No virus found in this outgoing message.
Checked by AVG Free Edition. 
Version: 7.5.476 / Virus Database: 269.10.20/919 - Release Date: 2007-07-26 09:56