In the keyboard itself, this is the oscillator sub-chassis that carries the tubes V1 and V2. Part numbers correspond to the circuit diagram on the Maestrovox Official Website.


Again, all components and sleeved wiring needed replacing.


This sub-chassis is very hard to access, as the bottom rear corner has a hole through it, through which a shielded cable passes. I filed away the sub-chassis so I could free the cable from it. Along the rear edge, the sub-chassis has been hacked away, at the factory, to allow it to fit without hitting the keyboard resistor string.


These are  the Low and Medium octave oscillator capacitors. The rectangles are 1% capacitors, while the cylinders are compression trimmers. There is also one of this sort of capacitor directly on the rear of the octave select rotary switch. All three of these capacitors will need to be replaced. Two of them have already failed, reading around 5k6 on the resistance range of a multimeter.