I had an SB-220 with Amperex graphite anode 3-500's in it. They were
virtually indestructible, although they didn't put out quite as much as the
old Eimac tantalum plate versions.
----- Original Message -----
From: "John T. M. Lyles" <email@example.com>
Sent: Monday, April 08, 2002 12:37 PM
Subject: [Amps] 4-400G
> I saw a RCA 1 kW broadcast TX last week that was running new Amperex
> 4-400's that were graphite plate, without the fins that are on the
> Eimac/Triton style (that look like 3-500Z plates). The plates were
> smooth cans, and they were glowing cherry red in the modulator. They
> were made by the Covimag factory in France, which Richardson gets
> their 'amperex' tubes from. Anyone have any 3-500 experience with
> tubes having this sort of plates in them?
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