The guys ar HF Signals were saying that these are faulty LM380s. A replacement works without the interference. I will attempt this on my own board and report back with week.
On Mon, Sep 12, 2022, 5:28 AM Anthony Good <anthony.good@...> wrote:
Has anyone attempted to troubleshoot this issue recently?? This evening I placed a grounded piece of PC board on top of the LM380 and also tried 0.001uF caps between pins 14 & 3 and 7 & 8, to no avail.
I may just bypass the LM380 audio amp and place an outboard 386 audio amp board in to drive the speaker¡.
