It appears that the 1700 does not provide output jacks for its preamp section. Therefore I believe the only way you can use it as a preamp would be to connect a speaker-level to line-level converter between the 1700's speaker outputs and the 275's inputs. Such devices can be found via a Google search. You would want to make sure that the converter is rated to handle amps capable of providing 40 watts, plus some margin.
Of course with that approach you would essentially have two power amps as well as the converter in the signal path, which isn't likely to be optimal from a sonic standpoint.
Regards,
-- Al
Of course with that approach you would essentially have two power amps as well as the converter in the signal path, which isn't likely to be optimal from a sonic standpoint.
Regards,
-- Al