Barrie Smith wrote:
> The filament voltage for the 6C21 in pulse service is 8.3 volts. For normal
> service it is 7.5 volts.
>
Emission at either voltage is not a problem<:-)) I don't remember the
emission limit, but it's way past several amps and the filament voltage
is not critical.
73
Roger (K8RI)
> 73, Barrie, W7ALW
>
> ----- Original Message -----
> From: "Fuqua, Bill L" <wlfuqu00@uky.edu>
> To: "Barrie Smith" <barrie@centric.net>; <amps@contesting.com>
> Sent: Friday, January 29, 2010 12:39 PM
> Subject: RE: [Amps] 6C21
>
>
> 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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