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I have a fader from a Sonomatic Radio and was wondering if it would work on my Wonderbar radio ? I not even sure where it plugs into? 

                                          Thanks, Scott

 

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RivNut    956

I'm assuming that you already have a rear seat speaker.  This takes the place of the outer ring behind the tuner.  There a reostat inside the bezel.  The wires then direct the sound to the front, baking, or fade between the two as you turn the outer ring.  If it's meant to to work on your radio, you'll be able to tell what to unplug and hoe to plug the fader in.  The ones that I'm familiar with have three prongs on them that plug into the radio.

Edited by RivNut (see edit history)

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NTX5467    617

On many Chevrolet models, mono, they used two bent (90 degree) prongs on the end of the short harness that plugged into two inconspicuous holes just below the tuning shaft.  The fader knob slipped over the tuning shaft to run the front/rear fader function for the rear speaker.  The speakers it went to were "internal ground" speakers, which needed only ONE wire going to them.  The pictured item, being for a "stereo radio", would have the pictured three wires, I suspect.  The "circuit board" approach was probably a later version of "the prongs"?

 

For many applications, it seemed that GM-Delco built a "universal" chassis and added things to it.  The plug-in rear fader for the mono radios, for example.  We normally associated "stereo" with 4 speakers, but GM still had some vehicles which used front speakers as standard and added rear speakers as an option (even a dealer-installed option kit, probably).  By the middle -to-late1970s, they had gone to an internal stereo "fader" and dedicated connector on the rear radio plug-in area  On the stereo applications which used two speakers, one channel was the front, the other channel was the rear, with this set-up.  ALSO, don't operate the radio without any speakers attached as it might blow the output amplifier(s).  Each output needs at least ONE speaker hooked to it.

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RivNut    956
5 hours ago, NTX5467 said:

  ALSO, don't operate the radio without any speakers attached as it might blow the output amplifier(s).  Each output needs at least ONE speaker hooked to it.

Good advice, but don't attach any of the new 4 ohm speakers.  it's just as if there were no speakers at all.  10 ohms is what the radio is.  Some folks say you can get by with 8 ohm speakers but there are 10 ohm speakers out there.  

 

These guys will have what you need.  

 

http://www.turnswitch.com/speakers.htm

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