It is a grounded cathode design, not G-G.
3500VDC @ 300ma = 1 kilowatt input, 600W out. It would be a fun project.
Looks like the Q was set to ±12.
Bob W6TR
----- Original Message -----
From: "Bill Fuqua" <wlfuqu00@uky.edu>
To: "AMPS" <amps@contesting.com>
Sent: Monday, March 02, 2009 6:40 PM
Subject: [Amps] Fwd: Re: 833A
>
>>Date: Mon, 02 Mar 2009 13:33:56 -0500
>>To: Robert Perdue <kc0hfl@cox.net>
>>From: Bill Fuqua <wlfuqu00@uky.edu>
>>Subject: Re: [Amps] 833A
>>
>> I don't recall any grounded grid amplifier articles published using a
>> 833.in grounded grid but it has similar amplification factor as a 250TH
>> and I have run a pair of 250TH tubes in grounded grid as a teenager. That
>> was before I was informed that you had to have higher Mu tubes for
>> grounded grid. So, even though some will say it will not work, It will.
>> You have to have a bias supply and the cathode impedance will be a bit
>> high, which was no problem back then since I was driving it with a pair
>> of 6146Bs via a pi network. The mu should be 35 or so and bias supply
>> (depending on idle current and plate voltage) around -70 to -100 volts.
>>73
>>Bill wa4lav
>>
>>
>>At 01:18 AM 3/2/2009 -0500, you wrote:
>>>I acquired an 833A RF deck it is a 40/80M deck the only markings that may
>>>refer to the design is P.J. 2000 on the front panel. Info is a little
>>>scarce on this tube as far as rf amps go any ideas of what and when it
>>>may have appeared in a handbook or a QST? I would like to at least try it
>>>looks cool grounded grid thru a 55 ohm 100w resistor.
>>>
>>>
>>>Bob,kc0hfl
>>>_______________________________________________
>>>Amps mailing list
>>>Amps@contesting.com
>>>http://lists.contesting.com/mailman/listinfo/amps
>
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