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

[donroden at hiwaay.net]

More rugged screen and grid structure for high vibration ( read military ).
Don W4DNR

Quoting Colin Lamb <k7fm at teleport.com>:

> 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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