There was at least one other glass envelope tube that was larger than the
2000T.
I believe it was a 2500 watt tube. Not made by Eimac. Look in Frank Jones
1937 handbook. Can't locate mine at the moment.
73, Barrie, W7ALW
----- Original Message -----
From: "Carl" <km1h@jeremy.mv.com>
To: "Manfred Mornhinweg" <manfred@ludens.cl>; <amps@contesting.com>
Sent: Tuesday, August 28, 2012 3:25 PM
Subject: Re: [Amps] 4-5000 and others
> 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
>>
>>
>> ========================
>> Visit my hobby homepage!
>> http://ludens.cl
>> ========================
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>
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