[Amps] Power from Pair of Eimac 4 x 150 a / 7034?

[rmorris]

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 at 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 at contesting.com] on behalf of Colin Lamb [k7fm at teleport.com]
>> Sent: Sunday, December 28, 2014 8:15 AM
>> To: Peter Voelpel; amps at 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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> 
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