Greetings:

From the manual: The SE-3 phase-locked AM Detector is designed for use
with a high quality communications receiver for vastly improved AM
reception. This high fidelity detector-amplifier combination requires
only an IF signal, speaker (or headphones) and 20 to 24 VAC (20 VAC
adaptor included).

Retailed for US$549 !!

http://search.ebay.com/_W0QQfgtpZ1QQ...5QQsassZve3tjd

Thanks, Tedd
VE3TJD