I can't find the thread or initial question leading to this but you are right.
It is practically the same as a
450T.
different filament voltage and current and slightly different mu.
The 6c21 has a pulse rating on the plate voltage of 30 kV.
http://frank.pocnet.net/sheets/088/4/450TH.pdf
http://home.comcast.net/~n6jv/data/6C21.pdf
Bill wa4lav
________________________________________
From: amps-bounces@contesting.com [amps-bounces@contesting.com] On Behalf Of
Barrie Smith [barrie@centric.net]
Sent: Friday, January 29, 2010 1:45 PM
To: amps@contesting.com
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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