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It’s become increasingly challenging to find suppliers that stock the original C64 sized power switch for MB-6582 and sammichSID. My standby had been the Retroleum shop: https://www.retroleum.co.uk/c64-misc-components-fuse-etc But, they're not shipping at this time, due to Covid-19 impact I managed to find two suppliers on eBay that seems to have good on-hand supply: Suppler based in UK https://www.ebay.com/itm/401182009175 Supplier based in the US https://www.ebay.com/itm/402027981537 Cheers!

that's the bit that's confused, each chip is 3 voice mono - so pairs are used to create stereo. I think it's unlikely you'll get two SID chips that sound identical no matter if they're from the same day in the same factory really, they were a bit variable to begin with and they're now 30-40 years old. 8580s are apparently a lot less varied than the 6581s though...... As long as they're in the same ballpark the differences just tend to make them sound wider (and pretty great). I don't think worrying about which year/factory they were produced in is too important (and will be difficult now anyway as the supply of them is not great!) Having said that I did try to pair mine based on the dates on them, so I get the inclination to do so!