They were made in three different sizes, 1×8" (one 8" speaker), 1×10", and 1×15".They are all very rare today and few have survived.Thus as an example 606452 is a transformer code: 606 tells us it is a Schumacher transformer made in either 1964 or 1974 and and it was built on the last week of December.If the transformer was read from a silverface Vibro Champ we can deduce it was made in 1974 – almost…
There are also exceptions to the rules where Fender delivered non-standard speakers in special orders, Christmas campaigns etc. See our Buyer’s guide to vintage Fender amps for a guide and picture gallery of the known original speakers in the blackface and silverface amps.
Cabinet Sticker By far the most reliable way to date your amp is to look for the month/date code stamped on the tube layout sticker on the inside of the cabinet.
A00100 to A02000 – 1964 A01200 to A08100 – 1965 A08100 to A17000 – 1966 A16000 to A21000 – 1967 A20000 to A26000 – 1968 A25000 to A28000 – 1969 A28000 to A29000 – 1970 A29000 to A32000 – 1971 A32000 to A35000 – 1972 A33000 to A39000 – 1973 A39000 to A42000 – 1974 A42000 to A51000 – 1975 A51000 to A53000 – 1976 Export models had serial numbers that started with a “B” rather than with an “A”.
Fender amplifiers began making a name for themselves with the Tweed series, so called because of their cloth covering, which is actually varnished cotton twill (tweed is a coarse woollen fabric, commonly used for jackets, coats and caps; it is often woven in a twill pattern, which is likely the reason for the confusion over naming.) They were produced for more than a decade and are now eminently collectible and praised for their sound quality.
was made can be determined through a variety of sources.