That link was posted earlier today. I already have the hard copy so didnt
save the info.
Carl
----- Original Message -----
From: "Fuqua, Bill L" <wlfuqu00@uky.edu>
To: "Roger" <sub1@rogerhalstead.com>; "Barrie Smith" <barrie@centric.net>
Cc: <amps@contesting.com>
Sent: Friday, January 29, 2010 10:23 PM
Subject: Re: [Amps] 6C21
>I found a application note by Bill Orr on the tube and it even specs the
>tube for cathode driven AB2.
> For about 100 watts drive it produces 900 watts output. I believe the
> filament was 8.3 volts. I need to find it again.
> Got it off the internet but can't find the link now. The grid bias was -50
> volts and plate 3000. Cathode impedance a few hundred ohms
>
> Bill
> ________________________________________
> From: amps-bounces@contesting.com [amps-bounces@contesting.com] On Behalf
> Of Roger [sub1@rogerhalstead.com]
> Sent: Friday, January 29, 2010 3:58 PM
> To: Barrie Smith
> Cc: amps@contesting.com
> Subject: Re: [Amps] 6C21
>
> 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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>>
>>
>>
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>>
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