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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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