>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.
later
>----- Original Message -----
>From: "2" <2@vc.net>
>To: "Rick Nichols" <rickn@netdoor.com>; "AMPS" <amps@contesting.com>
>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, www.vcnet.com/measures.
>> end
>>
>
>
- R. L. Measures, 805.386.3734,AG6K, www.vcnet.com/measures.
end
--
FAQ on WWW: http://www.contesting.com/FAQ/amps
Submissions: amps@contesting.com
Administrative requests: amps-REQUEST@contesting.com
Problems: owner-amps@contesting.com
|