Hi , reverb is a cool thing !
Stereo was just coming out then and some early stereo recordings had highly enhanced “ separation” so you could show your friends that “effect “ = wow its on the right or left“ etc .
So AM and early single channel FM receivers were at a big disadvantage . So Motorola came up with delaying the back sound 10’s of milliseconds , it sounded like a well designed concert hall ( there , it happens by echo off the shaped walls , which takes a certain time ) .
Stereo separation in a car back then was dicey too . I liked it!
The way it worked ( from reading about it then ) a small speaker ( transducer ) powered by rear speaker wires from main radio shakes a mechanical coil spring , about the size of screen door spring , so sound travels a long path moving the spring . , then a microphone type action picks it up at far end .
But that greatly reduced the volume —so a transistor amplifier is in there running on 12 v boosts it back up .
The 12 v for that must come by the radio switch or acc switch ( on all the time running? ) , so check that 12 V feed . The amplifier is subject to bad capacitors — over time they die , or early semiconductors failing . Same as early radios . A good radio guy can fix that and should not be much money . If inclined go at it your self , find the Sam’s’ radio repair folder it is in , those are on eBay now . Will need it to fix right anyway . If not in FSM .
You will like it !
John
Sent from my iPhone
On Sep 2, 2022, at 2:16 PM, Ray Jones <1970hurst@xxxxxxxxx> wrote:
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