This is the HR-6 Eimac cap on the left. I cant imagine the need for
excessive aluminum on the tube in any 3-500Z commercial ham amp. Maybe for
11M.
http://www.mwpersons.com/images/Eimac_HR-6&8.jpg
Carl
KM1H
----- Original Message -----
From: "John E. Cleeve" <g3jvc@jcleeve.idps.co.uk>
To: <amps@contesting.com>
Sent: Thursday, July 01, 2010 3:43 PM
Subject: [Amps] New High Efficiency 3-500Z plate caps
> Gentlemen,
>
>
>
> I cannot get to my stock of Eimac 3-500 glass chimneys at present, but I
> recall, the Eimac drawing of the 3-500 glass chimney shows that the top
> edge
> of the chimney is formed into a pronounced inward lip of about a quarter
> of
> an inch, or more, in width, which directs the emerging air flow coming up
> the chimney from around the side of the tube, over and across the top of
> the
> 3-500 and directed so as to cool the glass/metal seal of the anode cap
> connection. The "finned" top cap was, or still is, the one shown in most
> published designs for 3-500 amplifiers....73, John G3JVC / GM3JVC.
>
>
>
>
>
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