[Amps] Different 3-500Z amplifiers

[Carl]

Metal anodes were produced by Eimac and China.

Graphite anodes were/are produced by Eimac, Amperex, Philps, and China.

Carl
KM1H


----- Original Message ----- 
From: "Paul Baldock" <paul at paulbaldock.com>
To: "'Amps reflector'" <amps at contesting.com>
Sent: Monday, May 27, 2013 10:05 PM
Subject: [Amps] Different 3-500Z amplifiers


> 
> 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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