![]() The second serial number system was implemented in January 1965 and used until the end of 1969. For example, an amp with serial number 406123 was made in 1964 (4), during June (06) and was probably the 123rd amp made that month (123). Nevertheless, for dating purposes, the serial number provides adequate information during this period. Ampeg may very well have used 100 or 101 as the starting point during slow production periods. The # unit, however, may not have started with 001. The first serial number system are 6 digits in length with the following pattern: YMMNNN, where Y denotes the year, MM the month, and NNN the # unit produced that month. ![]() Other 1965 Portaflex characteristics: White silkscreened graphics, two channels with guitar and bass input jacks on channel 1, black stove type knobs, CTS and Centralab potentiometers, three metal switches, two large black transformers, black tube cage protecting the tubes and capacitors, light up plexiglass logo, fuse, two prong power cord, schematic, handles, 4 pin XLR speaker cable and jack, 4 chrome lid latches, chrome script logo, Blue Check vinyl covering, silver grille cloth, 15 inch speaker, matching dolly with wheels, protective vinyl amp cover, literature. During the year the tilt back rod was discontinued. ![]() Later in the year Ampeg discontinued the serial number sticker inside the speaker cabinet and started stamping the serial number into the back left hand side of the shock-mounted chrome chassis. ![]()
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