10-11-2017, 09:17 AM
Hi.
The noise is definitely coming from the vibrator and combined output stage. I bet if you bond both head unit and power supply together either with thick braided wire or even put the covers on and tightly sit the power supply on the radio the problem will go.
This issue wasn't just confined to your set it was common on many sets that had a remote vibrator supply. Incidentally have you replaced all the caps and checked the chokes around the vibrator. I'm also sure from memory this is a higher frequency vibrator to enable smaller value decouplers that are also physically smaller.
The noise is definitely coming from the vibrator and combined output stage. I bet if you bond both head unit and power supply together either with thick braided wire or even put the covers on and tightly sit the power supply on the radio the problem will go.
This issue wasn't just confined to your set it was common on many sets that had a remote vibrator supply. Incidentally have you replaced all the caps and checked the chokes around the vibrator. I'm also sure from memory this is a higher frequency vibrator to enable smaller value decouplers that are also physically smaller.
