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[AMPS] 572-B Input impedance??

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Subject: [AMPS] 572-B Input impedance??
From: measures@vc.net (Rich Measures)
Date: Fri, 23 Jul 1999 15:48:09 -0700


>TU Rich!  I am also thinking about trying neutralization on the amp,  Maybe
>using a piece of solid copper from a piece of house romex wire (abt 14 or 12
>gauge I guess?) and running it parallel to one of the tubes abt 1/2 inch
>away??, then to the filament choke and wrap abt 4/5 turns around it  in the
>same direction that the choke was wound then to ground???  Does that sound
>abt right?  

Beats me.  I know of no way to neutralize a grounded-grid amplifier.  

>It "takes off" when I key it and turn the tune cap, then the
>grid skies and the plate turns red, even if I un-key it at that time it
>"takes off". 

Wow.  I would be interested to know the grid resonance and the anode 
resonance.  Does it take off with the suppressors removed?

later,  Phil


Rich...

R. L. Measures, 805-386-3734, AG6K, www.vcnet.com/measures  


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