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Subject: [AMPS] 4-1000 IDLING CURRENT
From: (Ian White, G3SEK)
Date: Mon, 30 Mar 1998 13:52:35 +0100
Jon Ogden wrote:
>I wouldn't put more than 6 kV on the anode of a 4-1000A.  6 KV is the 
>maximum that Eimac specs, or am I missing something here?
>What I want to know is if ANYONE is able to get the 2050 W out that Eimac 
>claims with a plate voltage of 5 KV, and plate current of 650 mA from 90 
>W of driving power?  This is from an official Eimac publication!
In linear operation there has to be a compromise between output power and
IMD. According to a former Eimac employee [*] there was always a struggle
between the engineers and the marketeers over the "typical" operating
conditions that would appear in the datasheets.

We can be guided by the datasheets but we can also do our own measurements
and our own thinking. It's also worth noting that some of those datasheets
are now 30+ years old, and many amateurs now have better test equipment
than even Eimac had at the time.

On the other hand, when it comes to "absolute maximum" ratings we should
still listen to the people who have the largest collection of failure
statistics, and that's usually the tube manufacturers.

[*] Not anybody on Rich's "Most Wanted" list  :-)

73 from Ian G3SEK          Editor, 'The VHF/UHF DX Book'
                          'In Practice' columnist for RadCom (RSGB)

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