Any ideas on the value of Heil amt 1a tweeters?


Hey everybody,
I have a pair of Heil Air Motion Transformers from the 70's. I don't have the cabinets, just the transformers and I want to sell them.
I couldn't find any information here on Audiogon about Heil but I have read about Heil other places and know they are highly regarded.
Thanks,
Mike
onguitar