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[AMPS] The G2DAF Amplifier; Intents and Purposes

To: <amps@contesting.com>
Subject: [AMPS] The G2DAF Amplifier; Intents and Purposes
From: 2@vc.net (measures)
Date: Sun, 26 Mar 2000 10:53:01 -0700
>Hi Phil:
>
>My answer is: (g) - not sure.
>
>G2DAF would be the only person who could properly respond, and he has been
>on a dx-pedition for years.   Unfortunately, the G2DAF amplifier is not of
>sufficient power to allow him to "get out" from his present location, even
>though his final has handles.
>
>Since G2DAF was a designer at Mullard, we must give him some credit for not
>using a tube improperly.  The tube he used was similar to a 4-125 and would
>have been designed for linear service (at least as a modulator).  The
>operation of the G2DAF was not desgined to get more output than in "normal"
>service, but did save money by eliminating grid bias and screen supplies.
>
>Although that design was novel, I believe the same tube could have been used
>in grounded grid service with additional savings in components.
>Additionally, grounded grid offers additional inverse feedback which reduces
>distortion.  I do not yet know if this particular tube (or other similar
>tetrodes) were used in grounded grid service at the time of development of
>this design.  That might be an interesting question, though.
>
>Today, perhaps there are just a few reasons to use the G2DAF circuit.  One
>would be to experiment and the other would be to use surplus tetrodes which
>might not be usable in grounded grid.  

Please name one.  thanks

>In respect to the latter, the savings
>would be in not needint a screen supply and grid bias.  But, that is where
>the debate continues.
>
A screen or bias  supply in a g-g amplifier?  [chortle]  

>Colin  K7FM
>
>
>
>


-  Rich..., 805.386.3734, www.vcnet.com/measures.  
end


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