Replacements
------------

Replace R454,R400,R346,R299  with 130 Ohm 1% resistors.

Replace R522,R511,R491,R476  with 47 Ohm 1% resistors.

Removals
--------

Remove C45


Mods
----

Rotate C222,C218,C205,C197,C171,C169,C160,C146 90 degrees to attach one
side to +17V and the other to GND.

Add cap on NHIT100 subtraction---10 pF between C128 and R254.

Cut trace from R478 to pin 14 on U76, then connect  R478 to pin 12 of U76.

Swap  trimpot leads