This unit costs $650 at Tucker Electronics (a used electronics dealer).
:SATISFACTION:
The 334A Distortion Analyzer covers 5Hz to 600kHz frequency
range. The unit measures down to 0.1% full-scale distortion, residual
noise measurement below 25 µV, and voltages over a wide range, 300 µV
to 300 V rms full scale. Some of the features include an Auto Nulling
feature, which speeds up the time consuming portion of measurements,
an AM Detector, which has a frequency range from 550kHz to 65MHz and
a 1kHz High-Pass Filter, which attenuates frequencies below 400Hz,
reducing the effect of hum components.
(Click on the thumbnail images to enlarge)