PSR's 630, 2000, 3000 - no crashes ever

Ensoniq ESQ 1 - Irregular crashes
tracable to chip creep and / or loose connectors and / or dodgy sliders, then eventually to old age

Ensoniq SD 1 - Irregular crashes
tracable to chip creep and / or loose connectors and / or dodgy sliders (there's a pattern here folks) but now it goes out tune every 10 minutes! I think its the power supply but I've not had the nerve to try to fix it!
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John Allcock