Though the "R" was for "linear service"... Maybe more better IMD. Have some.
Sent from my iPhone
> On Dec 28, 2014, at 16:59, Colin Lamb <k7fm@teleport.com> wrote:
>
> And, just to complicate things a bit, the 4CX250R is stated to provide more
> output than the 4CX250B. I think it is rated for repeater usage, although
> the bias and characteristics are different than the 4CX250B.
>
> 73, Colin K7FM
>
>
>> On 12/28/2014 1:34 PM, Fuqua, Bill L wrote:
>> I suspect when EIMAC came out with the 7034 they wanted to suggest that
>> they were a good replacement for the
>> 4X150A. Military particularly wanted to use the same part number when
>> replacing tubes in their radios, and I suspect that
>> EIMAC wanted to not only promote the 7034 they wanted to make one tube type
>> rather than 2.
>> There are subtle differences between the two tubes, besides plate
>> dissipation limit. The characteristic curves for the 4X150A does not show any
>> area where there is a negative flow of screen current, while this is an
>> obvious issue some times with the 7034 and 4CX250B.
>> This could be a problem in some cases when interchanging these tubes. There
>> are other differences, one is that
>> when operating the 7034 at 500MHz it does produce the same output power but
>> requires 1/3 the drive power.
>> 73
>> Bill wa4lav
>>
>> ________________________________________
>> From: Amps [amps-bounces@contesting.com] on behalf of Colin Lamb
>> [k7fm@teleport.com]
>> Sent: Sunday, December 28, 2014 8:15 AM
>> To: Peter Voelpel; amps@contesting.com
>> Subject: Re: [Amps] Power from Pair of Eimac 4 x 150 a / 7034?
>>
>> "The Eimac data sheet does not confirm that
>>
>> http://www.r-type.org/pdfs/4x150a.pdf
>>
>> The RCA 4X150A/7034 data does:
>>
>> http://pdf1.alldatasheet.com/datasheet-pdf/view/241849/ETC/7034-4X150A.html";
>>
>>
>>
>> The RCA data sheet refers to a 4X150A only, which is a different tube than
>> the 4X150A/7034.
>>
>> 73, Colin K7FM
>> _______________________________________________
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>> Amps@contesting.com
>> http://lists.contesting.com/mailman/listinfo/amps
>
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