does anyone service the old GRF of the mid 1960's

You may want to check with the Speaker Doctor in Charlotte, NC.

Carl of
Classicloudspeakerservices.com
right here in Connecticut should be able to help you.
Also, talk to Carl about the Connecticut Audio Society which often meets in Westport (including this August), and should give you an audio buddy system second to none.

Would love your GRF speakers if you would decide to sell them. Bob rda5555@hotmail.com