[Amps] 3CPX800A7

[Carl]

As previously noted the primary benefit of the pulse version is cost and 
availability as medical pulls. Their production is also much higher than 
the non pulse version.

Carl
KM1H


----- Original Message ----- 
From: "Roger" <sub1 at rogerhalstead.com>
Cc: <amps at contesting.com>
Sent: Thursday, December 25, 2008 1:59 PM
Subject: Re: [Amps] 3CPX800A7


>
>
> Gudguyham at aol.com wrote:
>>
>> In a message dated 12/24/2008 9:46:26 A.M. Eastern Standard Time,
>> W1UJ at arrl.net writes:
>>
>> This  looks like an awesome mod for the Titan, I don't get the 
>> feeling
>> the P is  a drop in.
>>
>>
>>
>> The "P" can be dropped in with no problem.  No extra gain  though.
>>
>
> They are basically the same tube except the "P" has more cathode
> emission capability (IIRC).
> They are physically the same so there is no more "head room" than with
> the regular 3CX800. IOW used in a given duty cycle such as RTTY they
> perform the same.  With pulse the "P" version can run a higher peak
> power.  Used in a commercial amp you should see no difference without
> driving it harder which would probably require more air.
>
> All in all they are a good replacement if available at reasonable
> prices.  For more power, as I said it takes more drive and more 
> cooling.
> The amount of extra power gained in that fashion is not all that 
> great.
> You do see "export versions" of some amps using 3, 3CX800's and that 
> is
> noticable, but for a couple thousand dollars you are still only 
> gaining
> about 50% of two tubes, or less than 2 db.
>
> Having said all that, (IIRC) Henry used to make a version of the 
> 6-meter
> amp that used to 3CPX800 to run the legal limit on CW and SSB.
>
> 73
>
> Roger (K8RI)
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