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[AMPS] 4CX15000

To: <>
Subject: [AMPS] 4CX15000
From: (2)
Date: Fri, 6 Jul 2001 09:31:26 -0700
>I guess I have bad information.  I see the filament voltage as 6.3  NOT 7.5
OOPs.  6.3V is the rated fil. V the 4CX15.000A, Russ.  The 4CX15,000J is 
the version with the 7.5v filament.  

sorry for the technoblunder.  

>----- Original Message -----
>From: "2" <>
>To: "Rick Nichols" <>; "AMPS" <>
>Sent: Friday, July 06, 2001 9:09 AM
>Subject: Re: [AMPS] 4CX15000
>> >
>> >I have a 4CX15000 that I would like to trade for a 4CX5000.  Email me if
>> >interested.
>> >
>> >Rick
>> >
>> /\  The 4CX15,000A/8281 is quiet similar to the 4CX5000A/8170.  Both use
>> the same socket, have handy handles, and have 7.5V filaments.   For the
>> 8281, the anode current, Filament current,  and voltage ratings are
>> roughly a third higher than for the 8170.  This allows the user to
>> produce up to about 1/2 of 1 S-unit (3db) more watts.  However, the 8281
>> can be operated from a 8170's power supply with ease.  The major
>> difference between these tubes is that different diameter chimneys are
>> used.  Also, when switching tubes the neutralization and the brid bias V
>> need to be touched up.  The big advantage of the 8281, is a freer-flowing
>> anode cooler.  Thus, when an 8281is used at 8170 ratings, it can be
>> cooled by a quiet slow-speed/1750 RPM blower.  However. the 8170 needs a,
>> Much more noisy, high-speed/3450 RPM blower to ram air through it's
>> narrow cooler.
>> -   Both tubes can be rebuilt/recarburized and both make for an unboring
>> project.  However, it is my opinion that it not a good idea to use more
>> power than is needed to communicate.  Also, using such a beast to "win" a
>> radio contest does not warrant a feather in one's war bonnet.  /  see my
>> Website for info on designing tetrodes-with-handles/20db+ gain linear
>> amplifiers.
>> have fun, Rick.
>> -  R. L. Measures, 805.386.3734,AG6K,
>> end

-  R. L. Measures, 805.386.3734,AG6K,  

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