1967 AMPEG B18-N
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During 1967 the Blue Check vinyl covering changed to a smoother grained texture. Silver trim was added around the grille cloth (after serial #060600). The grille cloth now had a shinier, finer grain. The stove type knobs changed to knurled, or to round black with silver tops and set screws manufactured by Romar of St. Charles, Illinois.
1967 B-18 characteristics: Chrome chassis shock-mounted to the lid, white silkscreened graphics, two channels with guitar and bass input jacks on channel 1, 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, one leather handle on top, two chrome handles on sides, 4 pin XLR speaker cable and jack, 4 chrome lid latches, chrome script logo, serial number stamped onto the back left side of the chrome chassis, 18 inch Cleveland speaker, matching dolly with wheels.
The second serial number system was implemented in January 1965 and used until the end of 1969. These are 6-digit numbers which appear to have been applied sequentially, but are not date encoded. 1967 serial numbers ranged from 049000 to 075000. For more precise dating cross reference the serial number with the amplifier's transformer, potentiometer, capacitor, speaker codes and covering.