Didn't some of the letters mean different filament volts.
Sent from my iPhone
> On Dec 28, 2014, at 20:27, Carl <km1h@jeremy.qozzy.com> wrote:
>
> 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@teleport.com>
> To: <amps@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@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
>>> _______________________________________________
>>> Amps mailing list
>>> Amps@contesting.com
>>> http://lists.contesting.com/mailman/listinfo/amps
>>
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