Heath-Schlumberger SO 4550 scope

[Fred Olsen]

 >> Hi.  I have been given the above scope, of course it does not work..

 > About 1976 the Heath model number was not SO- but IO-4550,

Same scope, but the SO- is factory-built.  All parts should be
interchangeable between the IO- and SO-, except for any production
changes over time.

Good luck with it, Don.
Fred
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