[Sean B]

Thanks for the ideas!

The follower was biased at 9mA, driving about 7 volts peak-to-peak into a lightish 4.7k load. I'm measuring with an m-audio sound card which has second harmonic about 120 dB down at an output around 3V rms @ 1 kHz (sine).

One other thing I wonder about: a lot of components made today have iron in their lead wires, can this cause noticeable distortion compared to all copper?

S