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Old 24th Dec 2011, 12:14 am   #1
glowinganode
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Join Date: Apr 2009
Location: Aylesbury, Buckinghamshire, UK.
Posts: 1,522
Default VMARS RA17 product detector modification

Hi all, I've carried out the product detector modification as described here with good results.
The audio is very clear, and the agc now works properly.
I did find using even a 2pf capacitor provided too much coupling of the if signal, so i just used a couple of twists of wire.
Should pin 7 have a grid leak resistor (22k?), at the moment it's floating about dc wise.
Rob.
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