01-26-2012, 06:49 PM
I've been thinking about your radio, I've worked on 52 Plymouth radios, they are a two piece, you remove them unbolting the center section of the dash, speaker grill, and then they come right out , nice design.
Some of these 812 had dynamic field speakers ,if you have replaced the speaker with a PM type make sure your not using the 6 volt line, this will give a bad buzz, find the output transformer secondary that goes to the voice coil and the other side to ground ,as I remember. the power supply output chassie is where the dynamic field terminal is, on the back side ,stay away from it if your using a PM.
Lastly if you got the chassie on the bench it two pieces try a jumper from the ground side of the RF chassie to the ground side of the power supply chassie
Some of these 812 had dynamic field speakers ,if you have replaced the speaker with a PM type make sure your not using the 6 volt line, this will give a bad buzz, find the output transformer secondary that goes to the voice coil and the other side to ground ,as I remember. the power supply output chassie is where the dynamic field terminal is, on the back side ,stay away from it if your using a PM.
Lastly if you got the chassie on the bench it two pieces try a jumper from the ground side of the RF chassie to the ground side of the power supply chassie
