*** Barrie -- G-G is the only game in town for a triode linear.
Grid-driven is for triodes in Class C. With a Mu in the 30s, G-G gain
will be low, but still enough to be worthwhile - especially with a
plethora of anode V for SSB.
>Rich:
>
>Leaning on your expertise further, I have several 450THs. Would these be
>easier to drive, or yield greater output for given drive, in GG?
>
>73, Barrie, W7ALW
>
>
>----- Original Message -----
>From: "R. Measures" <r@somis.org>
>To: "Barrie Smith" <barrie@centric.net>; "Mark Foltarz"
><Foltarz@rocketmail.com>; "AMPS" <amps@contesting.com>
>Sent: Thursday, November 06, 2003 8:51 PM
>Subject: Re: [Amps] Anyone ever use a 6C21?
>
>
>>
>>
>> >
>> >
>> >
>> >> *** A triode with a Mu of 38 is OK for linear service, but only in g-g
>> >> configuration, However, the drive requirement would be higher than it
>> >> would be for high-Mu tubes.
>> >
>> >That's interesting, Rich.
>> >
>> >Previously, you mentioned a plate voltage of something on the order of 8
>KV
>> >for linear service. I'm thinking that the 6C21/450 would be a "fun" 160M
>> >only amp.
>>
>> ** It should work on higher bands too.
>> >
>> >Given that I do have sufficient drive, what do you suppose the power out
>> >would/could be with 8 KV on the plate?
>>
>> ** Probably c. 1.5kW PEP out with 200w drive. However, if more drive
>> is available, c. 2800w PEP should be possible (8kV at 600mA in x 60%
>> eff., tuning pulser tuneup).
>> -- The most VHF-stable design for a 450TH in g-g is to submount the
>> socket in order to move the grid lead close to the chassis.
>> - I have a socket if u need one.
>> -- If I were building such an amplifier, I would use one fan above the
>> chassis and one fan below the chassis to cool the envelope. Also, with a
>> tube this old, an initial gas check with a high-potential tester might be
>> a good idea.
>>
>>
>
>
>
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|