Hi Fred,
I mention that both Ref5 and Ref40 which have "high" output impedance, require to work with powe ramp that has minimum of 20Kohm input impedance. That is some amps
that has very low input impedance, around 4Kohm, 600ohm, like VA, Soulution, Burmester.
Will not work very well with my Ref40.
For your question, I believe 5 and 40 has same input impedance value.
Toga
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