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

[Carl]

The 4CX250R was developed for high shock enviroments, military or civilian. 
The military version was the 7580W and a dual labeled pair was used in the 
Collins AN/URC-32 shipboard "transceiver" from the early 60's.

Carl
KM1H



----- Original Message ----- 
From: "Colin Lamb" <k7fm at teleport.com>
To: <amps at contesting.com>
Sent: Sunday, December 28, 2014 4:59 PM
Subject: Re: [Amps] Power from Pair of Eimac 4 x 150 a / 7034?


> 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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