[Arran]

Is it a 66B? A 66MB, or a 66S? Assuming it is a table model and not a console? It's a five tube two band set, sort of an updated Philco 60 with a more useful shortwave band. Generally I would say anywhere from maybe $20 up to $100 depending on condition and cabinet style. I've never owned a 66 but own a 60, a very generic five tube radio, good for what they are but nothing outstanding.
Regards
Arran