IM-1 Intermodulation Analyzer Kit. Supplies a choice of 2 hi frequencies (approx. 3000 Hz and 7000 Hz), and one lo frequency of 60Hz. Both 1:1 and 4:1 ratios of lo to high frequencies can be set up for Intermodulation testing, and the ratios are easily set by means of a panel control and the instrument's own VTVM. An output level control supplies the mixed signal at the desired level with an ouput impedance of 2000-ohms. The analyzer section has input level control and proper filter circuits feeding the instrument's VTVM to read Intermodulation Distortion directly on full scale ranges of 30%, 10% and 3%. 18 lbs. 1952 price: $39.50.