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Re: [Amps] 3-500zgs

To: Amps <>
Subject: Re: [Amps] 3-500zgs
From: Joe Isabella <>
Date: Sat, 31 Dec 2005 11:03:08 -0800 (PST)
List-post: <>
Couldn't it be that the graphites are totally different material than the 
standard Eimacs?

Jason Buchanan <> wrote:

> I don't think you want to run it in SSB (4kV) mode with a continuous 
> output (like data or AM). My 3K-A with RF Parts ZGs will do that, too but 
> the Tubes get pretty bright orange!! I can get almost 2500W PEP out of it 
> with ~175W drive, but I stick to 80-100W or so.
> On AM, I leave it in CW (3kV) and drive it to 375W Carrier. Seems like 
> it'll make output there aaaallllll daaaayyyyy looooooongggg... And the 
> tubes only show a little color. (You know how us AM'ers are!! :-) )

Must be the ZSAC - on my L4 on SSB position there is about 200mA, on CW 
position around 150mA. And i'm thinking the thickness of the plate material 
must be considerably more thin in the old Eimac 3-400Z than the 3-500ZG 
tubes. I know the Amperex 3-400Z 8163 take more current to get orange than 
the eimac 3-400Z.

73 Jason N1SU

Jason Buchanan - Boxboro, MA FN42fl

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