I remember seeing reports in Proc of IRE from years ago (30's, 40's
maybe?) from RCA on using graphite anodes. I'll have to do some
searching next week to get exact references and some explanation from
them.
John
K5PRO
To: <amps@contesting.com>
>Date: Fri, 22 Sep 2000 04:17:34 -0700
>From: Bill Turner <w7ti@jps.net>
>Subject: [AMPS] Graphite 3-500ZG
>
>I just purchased and installed a Chinese-made graphite anode version
>of the 3-500Z for my trusty old Heathkit SB-1000. The original Eimac
>tube had gotten gassy after sitting around unused for six or seven
>years. Made quite a light show when powered up.
>
>The new tube seems to be working fine - the only difference I notice
>is the anode is much more massive than the Eimac metal-anode version,
>and therefore heats up and cools down much more slowly.
>
>I'm just curious about the background of graphite anodes. Does anyone
>know how they came to be used in place of metal? Perhaps because a
>momentary overload would be less likely to damage the anode? Any
>information would be appreciated.
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