I think it was, but have no idea what the starting S/N was. It was near the end of the K3 run. 73, Carl AB1DD Resistance is futile. (don't know about reactance, though) On 1/25/2021 11:33 AM, Mike Kopacki wrote: > Was the KSYN3A synthesizer ever built into the K3 as a standard item? If so, beginning at what serial number? > > Thanks, > Mike NJ2OM