I do own an old Heathkit Signal Tracer.I dont see a model number on it.I
guess it dates back to the early 1960's,maybe the 1950's.It is portable
and has a metal carrying handle on top of it and what looks sort of like
a tuneing eye in the lower left front corner on the front.I think it is
a tube type signal tracer,oviously.I also own a small Micronta
Transitorized (it says transistorized on the front panel) Signal Tracer.

I also own a few other old testors for testing things related to radios
and tv sets,such as signal generators and tube testors.Stuff I bought
many years ago at thrift stores and fleamarkets and junk shops.I dont
know how to use those devices though.What it is,I like to collect all
kinds of old,old thingys.Whether I ever use that old stuff or not,it
doesn't matter to me.It's my junk and I like it.
cuhulin