wrote:
We have an old KR85 ADF receiver which is giving problems. It may be
economical to fix but if not are the antennas specific to model or can
just the receiver be replaced?

The Sense wire is "matched" to the reciever, and there are many
different ways that the ferrite loops can be driven/sensed.

The best you could hope for would be that a later model of the same
brand might utilize similar antennas. You will have to talk to a
knowledgable avionics tech.

MikeM
Skylane '1MM