The first helical-scan standard was based on the Ampex 1-inch format and was the first workhorse format for the educational and industrial markets. When Ampex introduced this format in 1965, SMPTE did not have any designated letter formats. SMPTE only had a Standards document for 2" Quad. With the Sony BVH-1000, it formed the basis of the SMPTE Type C standard. The original 1" format was then designated as Type A. High friction on the scanner, a flimsy base for the motor and an unusual capstan made machine interchange a problem. A joke amongst Ampex engineers was that there were 30,000 "Type A" formats since that's how many machines had been sold.