>From what I remember reading of some Machlett (the actual designer) 6C21
data decades ago it can be considered a cross between an Eimac 450 and 750
with a static Pd capability of around 600W. While not a complete answer its
filament power does fall between the two. I dont remember the ampification
factor. The 6C21 filament is 8.2V @ 18.8A while the 450 is a more modest
7.5V @ 12A.
In the early 60's I visited a few stations running a single 6C21 on 20M CW
and AM at close to 6KV. One rather famous ham ran a pair on 75 SSB with
7500V for years with a 30L1 driver....this was before IMD became important
(-;
Carl
KM1H
----- Original Message -----
From: "Barrie Smith" <barrie@centric.net>
To: <amps@contesting.com>
Sent: Friday, January 29, 2010 1:45 PM
Subject: [Amps] 6C21
> Carl & Roger:
>
> I'm really not arguing with you here. However, comparing a 6C21 to a 750T
> runs contrary to what I know about the tubes.
>
> An older, local ham gave me a NIB pair of 6C21s about 25 years ago. In
> the
> early 1990s I built a push-pull transmitter using the pair; modulated by a
> pair of 304TLs.
>
> I used a data-sheet written by Bill Orr when he still worked for Eimac.
> It
> clearly states that the 6C21 is comparable to the 450T series of tubes.
>
> 450 watt PD in CW and 300 watt PD in AM phone.
>
> After reading your recent posts I thought I may have missed something, so
> I
> went into the basement and compared a 6C21 to a 450TH. The 6C21 has a
> sturdier grid lead and a chrome plated base. Other than that, I see no
> differences between the two tubes.
>
> The anode is certainly no larger or snmaller in either tube. The base and
> socket are the same. The physical dimensions are the same. Filament
> voltage and current (according to the Bill Orr spec sheet) are the same.
>
> So?
>
> 73, Barrie, W7ALW
>
>
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