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From: henry@ginger.sri.com (Henry Pasternack)
Newsgroups: rec.audio.high-end
Subject: More comments on the Chater amp.
Message-ID: <8659@uwm.edu>
Date: 3 Jan 91 13:49:10 GMT
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   A couple of other things:

1)  I can't for the life of me find the text reference on the construction
    of "L1", the output choke.  The schematic says "see parts list", but
    there is no winding information.  I assume that the C25 and R40 form a
    resonant circuit with L1, and that the whole lot has been tuned for
    maximum stability.  Variations in the winding of L1 might have some 
    effect on ringing, and I'd like to know what the author intended.

2)  There is a discrepancy between the schematic and the parts list for
    the values of C1 and R2.  The schematic shows .47 uF and 100k Ohms,
    while the parts list shows .15uF and 330k Ohms.  I prefer the lower
    impedance values shown on the schematic.  I'm not sure why Chater
    chose such a high impedance input.  If you're worried about noise,
    you might consider using a 27k resistor at R2.  Depending on the
    noise figure of the transistors, it might make a small difference.

-Henry