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[Amps] Different 3-500Z amplifiers

To: "'Amps reflector'" <amps@contesting.com>
Subject: [Amps] Different 3-500Z amplifiers
From: Paul Baldock <paul@paulbaldock.com>
Date: Mon, 27 May 2013 19:05:05 -0700
List-post: <amps@contesting.com">mailto:amps@contesting.com>
I have 2 amps with 3-500Zs. The 3-500Z's have Eimac labeling. The 
anode of these has vertical fins.
I just acquired another amp with 3-500Zs. These tubes have no 
lebeling and have an anode with  a horizontal disks.
Could somebody educate me on the operational difference if any of 
these 2 very different looking 3-500Z's?
Thanks

- Paul

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