Simple, cycle the 3-500's thru your amp once a year or so. Eimac had a
problem in the mid to late 80's with leakage and plate welds breaking.
Ive yet to see a 572B with seal leakage, even with late 60's date codes.
Some that have been severely overheated will become contaminated.
Some ceramic tubes are also prone to leakage so consider setting up a
maintenance program.
Carl
KM1H
----- Original Message -----
From: <Randy.Randall@healthall.com>
To: "Amps" <amps@contesting.com>
Sent: Wednesday, May 21, 2008 11:41 AM
Subject: [Amps] Future of higher power transmitting tubes..............
>From some of the current threads running here it seems that Russian
>production is all but DOA and China is the last hope of new bottles. How
>much longer should we expect new tubes to be available? Is it time to put
>a couple (or more) back on the shelf? How about newer technology like
>Harris is using on their broadcast transmitters? I use 3-500Z and 572B's.
>Glass tubes do not like to sit unused due to gas leaking in. Whats a ham
>to do?
Randy AB9GO
Randy E. Randall
Network Engineer
The Health Alliance of Greater Cincinnati
Phone 513-585-7146
Fax 513-585-7159
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