MF#36 Vintage analog Synthesizer 1981 E&MM Spectrum Repair

A repair of a rare vintage 1981 synthesizer suffering from sample & hold drift and badly corroded key switch gear. these were Home made synths that was a project from a 1981 magazine. very few were ever completed. Tardis VFX at 21:30
I have to buy most items myself to make these video's so any help would be greatly appreciated "become a Patreon" / markusfuller