[Amps] 4CX250 IMD

[jeremy-ca]

----- Original Message ----- 
From: "Steve Thompson" <g8gsq at eltac.co.uk>
To: <amps at contesting.com>
Sent: Friday, September 28, 2007 12:54 PM
Subject: Re: [Amps] 4CX250 IMD


> jeremy-ca wrote:
>>
>> ----- Original Message ----- From: "Steve Thompson" <g8gsq at eltac.co.uk>
>> To: <amps at contesting.com>
>> Sent: Friday, September 28, 2007 2:30 AM
>> Subject: Re: [Amps] 4CX250 IMD
>>
>>
>>> jeremy-ca wrote:
>>>> According to my full size Eimac manual ( the yellow one with the multi
>>>> page spec loose leaf sheets) the only 4CX250 style tube with decent IMD
>>>> is the 4CX250R/7580 which was used in a lot of military equipment
>>>> including the AN/URC-32 that I worked on in the USN.
>>>>
>>>> At Ep of 1500 in AB1 3rd/5th is -30/35. However at 2000V it slips to
>>>> -23/27.
>>>
>>> At what power and efficiency?
>>>
>>> Steve
>>>
>>
>> 250/245 ma and 262/470 W PEP Note they specify PEP. There is also a
>> "worst case" 3rd order line entry of -29/21dB.
>
> Single tube or pair?
>
> Thanks, Steve


That rating is for AB1 SSB service, 2KV@ 250ma is the listed typical 
operation for one tube as with all in the straight 4CX250W family.

Carl
KM1H


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