[Amps] Fwd: Re: [Moon-net] 4CX250B in P-P 2m?

[Bill Fuqua]

OOPS I should have said 30 or 35 years ago.
>Date: Fri, 31 Mar 2006 14:01:17 -0500
>To: "Dr. David Kirkby" <david.kirkby at onetel.net>, "amps at contesting.com" 
><amps at contesting.com>
>From: Bill Fuqua <wlfuqu00 at uky.edu>
>Subject: Re: [Amps] [Moon-net] 4CX250B in P-P 2m?
>
>I have two with a pair of 4CX250Bs. But they are in parallel not 
>push-pull.  There was an article in the Handbook using copper pipe to make 
>a push pull  amplifier 30 or 45 years ago. But those were the days of 1kW 
>plate input limits.
>
>73
>Bill wa4lav
>
>
>At 06:51 PM 3/31/2006 +0100, Dr. David Kirkby wrote:
>>SM6CKU wrote:
>> > Hello guys
>> > Anyone knowing about a 2m kW amplifier in push-pull with 2x4CX250B?
>> > A friend of mine is asking....
>> > 73 de Ben
>> > _______________________________________________
>> > Moon-Net posting and subscription instructions are at 
>> http://www.nlsa.com/nets/moon-net-help.html
>> >
>> >
>>
>>Yes, I know it would be *seriously* over-run. The maximum anode voltage 
>>is 2 kV
>>and the maximum anode current per tube is 250 mW. So a pair of tubes 
>>should take
>>no more than 1 kW of input power.
>>
>>So needless to say, even if the 2 kW is input rather than output, it is 
>>at least
>>2x over the tubes specs.
>>
>>Or perhaps your fiend has found a way of getting 200% efficiency and so 
>>getting
>>2 kW out with only 1 kW in.
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