| Hi Jeff, I would be very interested in the schematic you have if it's a newer version than what they have on this site. Shot me an email when you have time. On my radio, both pots for the volume and the tone control come with on/off switches. Currently the tone control on/off switch isn't hooked up but the one on the volume control is. This might have been changed by whoever worked on this radio before me. Thanks for your help, sounds like you did quite a good job on that 670, I'm new to this also so I know how puzzling all of this can be!! I'm really hoping I can get this thing going again! Thanks, Steve
:I just finished a 670 and it had been worked (hacked) on early. The electrolytics were all in 1 box, It came with cut wires cold solder joints..a mess. To make a long story short I bought a schematic from Just Radios and got it working. One thing, I am fairly new to this but this radio uses the tone control and the one off on the same control. On my 670 the on/off tone is on the bottom, volume (by itself) on the left. Jeff
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Steve Bento 
Brett 