[HAM] AO-44 Reverb question

[Mike Kearney]

Hi, I'm a newbie,

Just acquired an M-2 from its original owner. It has a stuck run motor 
but we're working our way through that and I hope to hear it sing very 
soon. Otherwise it's in great shape. Discovered the phono input on the 
expression control and played guitar through it last night. The amp and 
the field coil speaker sound wonderful. Thanks for all the helpful info 
in the archives.

I know you can't make a silk purse out of a sow's ear, but I would like 
to add reverb to this M-2. (Possibly in a separate speaker enclosure.) 
I've located an AO-44 amp/reverb from an A-100. I'm puzzling over where 
the AO-44 gets its input signal from. I'm looking at a wiring chart from 
an M-100 (can't find an A-100) and it appears the AO-44 input lead is 
connected to the speaker lead. Does that makes sense? I would have 
thought it would come from an unamplified source. Any comments or advice 
appreciated.

Regards,
Mike