In ,
harrogate2 typed:

At a guess they may be 10" Super RSDD (that's roll surround doped
diaphragm)


They are actually 12" units...did they do a 12" Super RSDD around 1975 ?

Wharfedale (please observe the H) is now part of the IAG group based
in Huntingdon and IMSMC still repair old original kit - you can but
ask.


Thanks, I would expect Wharfedale (with the 'h' ) to insist on doing the
repairs rather than sending out parts. I will try them. I'll check them out.
They may, at least, have some info on the driver specs.

Otherwise try Castle Acoustics in Skipton. The Co. was set up - again
IMSMC - by a chap called Cliff Collinson who worked for Gilbert Briggs
at Wharfedale at about the time it was taken over by Rank and I think
had much to do with the design of the 8" and 10" RSDD drive units. As
Castle build their own units they may be able to help.

Again. thanks for the lead.

Jo