Speaking of that.
I still need a 1500T to complete my collection.
Someday I would like to put my 2000T on the air.
73
Bill wa4lav
At 09:34 AM 8/29/2012 -0400, Carl wrote:
>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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>
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