Dating a fender twin amp
The transformer code is EIA606-102 (right over it were the numbers 013691). The serial number is F106486, but right under it is the number 1860 stamped in what looks like black ink.
Stamped on the metal backing of most amps is the serial and production number. The following list, compiled by Greg Gagliano, establishes dates through 1976: A00100 to A01200 - 1964 A01200 to A04300 - 1965 A04300 to A07000 - 1966 A07000 to A10400 - 1967 A10500 to A11300 - 1967 A10500 to A16500 - 1968 A16500 to A21400 - 1969 A21400 to A25600 - 1970 A25600 to A37000 - 1971 A37000 to A50500 - 1972 A50500 to A68000 - 1973 A68000 to A99999 - 1974 A81000 to A99999 - 1975 B01000 to B15000 - 1975 B15000 to B68000 - 1976 If these steps are unsuccessful, a number of books have been published that help to date amps based on part codes. A 1957 tweed Vibrolux was reported with a tube chart printed with circuit “5E3” (tweed Deluxe) instead of the correct 5F11 (see photo).Clearly Fender wasn’t afraid to use incorrect parts when they were in a bind. The 5G12 Concert is the earliest version from very late 1959 and early 1960 so the existence of a tweed example, while extremely rare, is certainly plausible since Fender was making lots of tweed amps during the same time period.Remember, your amp is newer than the newest component.For example, if you find pots from late ‘64 and transformers from early ’65, you can be pretty sure your amp is a 1965.HTHArjay_________________"Here's why reliability is job one: A great sounding amp that breaks down goes from being a favorite piece of gear to a useless piece of crap in less time than it takes to read this sentence." -- BRUCE ZINKYLooks like the amp is in serious need of a new master-volume knob. Try wheeling and dealing with the seller before you buy -- anything beyond $600 for this one is a bit *optimistic*, methinks.