[Amps] 4-5000 and others

[Bill Fuqua]

A pair of 2000T tubes in push pull would produce 10kW in AM service.
I don't ever recall seeing anything larger in the Handbook.
73
Bill wa4lav

At 07:04 PM 8/28/2012 +0000, Manfred Mornhinweg wrote:
>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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