Tracor Northern TN-1550 Multichannel Analyzer with GPIB, Channel 1 & 2 Amp in, Sweep Out, Call Out, MCS / HIST In, Trig In, ADD / SUB, Stop Analyze, Control signals, Terminal, Stop A, Trig, Plotter.
These instruments seem to be functional, but it is beyond our capabilities to fully test them
There is one screen shot from each instrument
Item appears to be in working condition as it powers uo into self-test. May require calibration.