Dating a fender amplifier
For this essay, however, let’s take an alternative view and look at the company’s various electric guitars, its thinline hollowbodies and later solidbodies.The primary starting point for information about Martin guitars is, of course, Martin Guitars: A History by Mike Longworth, one-time pearl inlaying ace and former company historian (4 Maples Press, Minisink Hills, PA).The typical Martin pickguard had the front point cut off and a notch in back to make room for the pickups rings.A three-way toggle was mounted on the upper treble bout.Pickups remained our familiar De Armond humbuckers. Around 1,450 of these were made between January of 1966 and October of 1968.
The GT Series consisted basically of two models, the GT-70 and GT-75.
Other than the bookmatched cutaways, this was the same as the two-pickup F-55, with the addition of a Bigsby-made Martin vibrato in which the stylized “M” had become a similar “V” shape.
Probably the strangest feature of the F-65 was the fact that the heel of the neck did not change from the single-cutaway models, creating a sort of thick chunk of body extending up to the 14th fret. 1,825 F-65s were made from 1962 to the summer of ’65. In 1961 Martin marketed a pair of combos, the Model 110T and Model 112T. Presumably the 110 featured a 10″ speaker, while the 112 had a 12″. In 1962 Martin offered a very cool #700 portable amplifier, a unit ensconced in a leather carrying case, presumably battery-powered.
The major change was moving the heel forward to the body juncture, eliminating the awkward body extension of the F-65. 1,555 GT-75s were built from January ’66 to October ’68.
Mike Longworth also records at least three 12-string versions of the GT-75 (#218391, #218405, #218411).
The F-50 was the bottom of the line, a single cutaway with a single De Armond humbucker pickup, like those on the previous acoustic hybrids, in the neck position.