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[AMPS] G2DAF Amplifier etc.

To: <amps@contesting.com>
Subject: [AMPS] G2DAF Amplifier etc.
From: 2@vc.net (measures)
Date: Sun, 29 Oct 2000 10:48:09 -0800
>
>Barry Kirkwood wrote:
>>
>>The G2DAF design was featured in the 4th edition (1968) of the RSGB
>>Handbook, did not appear in 5th of 1976 which showed a 2x813 gg job.
>>
>>Suggests the editors thought gg better practice.
>>
>>Nevertheless G2DAF with 2x813 does seem highly reproducible, having been
>>featured on the cover of RSGB Radio Communication magazine just a few years
>>back, and is mentioned in that mag from time to time where users universally
>>speak to its tractibility and good performance.
>>
>>I would assume that hundreds, if not thousands of 2x813 G2DAFs have been
>>built.
>>
>
>Sorry, but none of that says anything about IMD.
>
>RSGB handbook editors tend to favour whatever was more recently
>published in the monthly magazine. It implies no technical judgement
>whatever. (The 813 design was DC-grounded screen... better practice?)
>
>Reproducibility and common use go together, but they still say nothing
>about IMD.
>
My pal Hal built a 2, 813 DAF amplifier.  IMD level was roughly -21db 
when he ran moderate grid current.  He eventually switched to G-G.  IMD 
improved c. 13db.  

end

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


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