Bond
I believe that you are totally convinced that he is a real genius and
that he thinks its the correct spec.
Problem is many amps with a given input impedance may be using use a
bipolar driver transistor instead of a JFET and have a varied Input impedance at some frequencies.
This then sends a leaner signal into the 2WQs feed forward design
This is why I have been trying to tell you
You really have to get a new AC voltmeter meter and confirm the impedance with the directions I gave you above.
Only the meter will know whats right.
JohnnyR
PS pop into the store and ill show you how to do it in 3 to 5 min