Does anyone know anything about KLH model 57?

I found a KLH Model 57 receiver at the goodwill store for $5. It looks like it just came out of the box. Anyway...I have not been able to find any info on this model. Anyone know anything? Thanks.
Try this site for classic KLH audio ... Classic Speakers Pages .

Regards, Rich
I found mention of the KLH 27 and 51 receivers, as well as others, but no 57. I assume you are sure the model number is 57.
Yep. It's a Model 57. I'll link some pics later.