The only 2500W tube in there has a finned external anode. Remove the fins,
attach a water jacket and it jumps to as much as 10KW for about the same
amount of glass.
H&K followed Eimac to at least 1500W with the HK-3454 but I cant find any
that equal the 2000T. That European tube looks interesting but very little
from there manages to cross the pond. The biggest one I have from over there
is the GU-81M.
Carl
KM1H
----- Original Message -----
From: "Barrie Smith" <barrie@centric.net>
To: <amps@contesting.com>
Sent: Tuesday, August 28, 2012 7:38 PM
Subject: Re: [Amps] 4-5000 and others
> 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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>>
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>
>
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