Found this Muson toy Synthesizer in the storage shed. Fired it up and it is in proper working order. Unfortunately it’s missing one of the sequencer plugs and currently only plays 9 of the 10 notes. This prompted me to open it up and try to determine the resistor value of the missing plug.

The 1978 Muson Synth toy. Perfect working condition, but missing one of the sequencer step plugs.

I poked around and found several interesting bends so I’ve decided to build a new custom case for this. I’m currently in process of removing all the control components that are mounted directly to the board and will move them to a new control panel.

Rewiring the controls and probing for bends.

More images here.
More to come…