[Amps] Fwd: Re: 833A

[Bill Fuqua]

>Date: Mon, 02 Mar 2009 13:33:56 -0500
>To: Robert Perdue <kc0hfl at cox.net>
>From: Bill Fuqua <wlfuqu00 at 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
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