While the 2000T is likely the highest dissipation tube that worked up well
thru HF that was strictly air cooled.
http://frank.pocnet.net/sheets/088/2/2000T.pdf
there were others that barely made it past the broadcast band.
There were also several others that looked like regular air cooled tubes but
had a copper base that was inserted into a water jacket. Water cooling goes
back to the late 20's early 30's.
Carl
KM1H
----- Original Message -----
From: "Manfred Mornhinweg" <manfred@ludens.cl>
To: <amps@contesting.com>
Sent: Tuesday, August 28, 2012 3:04 PM
Subject: [Amps] 4-5000 and others
> As usual, I come a bit late with my comment:
>
> I have no idea whether a 4-5000 existed, but I know for certain that big
> air-cooled tubes did exist.
>
> The Radio Club Concepcion, here in Chile, where I did my first steps in
> ham radio at age 13, had a nice display with some transmitting tubes.
> There were the typical 3-500Z, 813, 4-400, and others, and there were
> also some high power tubes of power leves far above the ham limit. These
> were all air-cooled glass tubes. The largest of them was easily 50 or
> 60cm tall, and maybe 15cm diameter, or a bit more. I remember an inside
> structure much like a 3-500Z, with a finned anode, but of course much
> taller.
>
> I have no idea what type number this tube had, nor do I know whether
> this was an American or European tube. But I was told that it was a pull
> from a local 10kW AM broadcast station, that started operation sometime
> in the 1930's.
>
> Given its size, it seems plausible that this tube ran the 10kW all by
> itself. In strongly driven class C that means probably no more than 2kW
> dissipation, at most 3kW, which must have been reasonably comfortable
> for this big bottle, sitting in the airstream of a fan.
>
> Manfred
>
>
> ========================
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> http://ludens.cl
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