The TF2370 was amongst the first spectrum analysers to use digital storage thus eliminating the need for expensive storage cathode ray tubes.

This one is in reasonable working order, although the attenuator is sometimes a bit dodgy.

It covers the frequency range 30 Hz to 110 MHz and so can be used for audio applications, although patience is required with the slow scan speeds when using narrow bandwidths. It is excellent for general purpose RF work up to the FM broadcast band.

There is a full manual, including maintenance information and circuit diagrams, below.