I am offering a spare parts service for rare and obsolete components for the EMS synthi A/AKS and VCS3 for those repairing/renovating these fantastic machines! The only other source I know of is of course Robin at EMS. My service is not intended to compete with his (if it ever could!) but given the rarity of some synthi parts, I think it's no bad thing to have more than one source if possible.
DO NOT STOCK PATCH PINS.
ONLY ROBIN WOOD AT EMS CAN SUPPLY THESE. PLEASE
ALSO I CANNOT OFFER KNOBS FOR SALE. PLEASE TRY ROBIN AT EMS.
Ring Modulator IC
The Achilles heel of the VCS3/Synthi AKS are the now obsolete and ultra rare semiconductors that it uses. Luckiliy there are only a few..unluckily they are uber-rare and often only available at high cost (and hundreds of $$ minimum order) from obsolete/military IC vendors.
Mullard TAB101 (very rare germanium transistor array based modulator.) Back in Stock!Reverb Driver Audio Amplifier IC
(Motorola 1 watt audio amplifier IC)..another
These are NOS 1970's.
amplifiers and reverb driver circuit. Vintage NOS.
Semiconductors specifically for the SYNTHI AKS
Keyboard Sequencer Memory Chips
MM5056H 10 lead, can. (ultra ultra rare old school PMOS shift registers )
MM5056N DIP version also available (same price).
Unfortunately there seems to be two versions of the KS produced, those using the can type 10-lead (MF7104) and later versions that used the plastic MM5056N DIP 10 pin type. You may have to verify which type of memory chip your KS uses by opening up the plastic lid of the KS and looking at the top left hand part of the pcb where the memory chips are located. Those using the MM5056 have 3 chips, those using the MF7104 can-style use 6. The MM5056H (can) and MM5056N (plastic DIP) can be used interchangably on the later KS versions. The tab on the can type marks location between pin1 and pin 10. The platic DIP version as the usual indent marking location of pin1. I am trying to source a supply of MF7104..but they are even harder than MM5056 to locate!