[Amps] Anyone ever use a 6C21?

[Barrie Smith]

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 at somis.org>
To: "Barrie Smith" <barrie at centric.net>; "Mark Foltarz"
<Foltarz at rocketmail.com>; "AMPS" <amps at 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.
>
>