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@rogerhalstead.com>
Cc: <amps@contesting.com>
Sent: Thursday, December 25, 2008 1:59 PM
Subject: Re: [Amps] 3CPX800A7
>
>
> Gudguyham@aol.com wrote:
>>
>> In a message dated 12/24/2008 9:46:26 A.M. Eastern Standard Time,
>> W1UJ@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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