[ForSale-Swap] Wanted... Audio Distortion Analyzer

[radioman]

Looking for a distortion analyzer.. that measures Harmonic Distortion
not I.M.

The heathkit Audio Analyzer for instance measure IM..and I have that.

These were made by HP, B and W, General Radio, and others.
Relatively modern is good... I work with tube radios and the voltages
associated with them.

Inexpensive or trade  ( I have only vintage tube type  ham stuff,no
collins )

Larry W6WUH