Dating fender amps transformer codes malta international dating
(with 8" speaker), changing a year later to "Champion 600" (6" speaker) with circuit designation 5B1. This style lasted until 1953, when Fender's cabinet style changed to the "Wide Panel" design with a tweed cloth covering.
Fender also renamed the circuit the "5C1", "5" standing for the decade (1950s), "C" for the third circuit revision, and "1" was the Champ's circuit designation.
The 5C1 circuit was extraordinarily simple, using one 6SJ7 pentode in the preamplifier section to provide a single stage of voltage amplification, one 6V6 beam power tetrode in the power amplifier section, a 5Y3 rectifier tube and a single volume knob with no tone controls.
By 1955 Fender started putting its amps in the "Narrow Panel" tweed cabinet with a plastic oxblood color grill cloth, circuits used a 12AX7 dual triode in the preamplifier to provide two stages of voltage amplification, and a single 6V6GT power tube to produce about 5 watts.
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.
It’s unknown if the tweed covering was a mistake (“Oops, I thought this was a 4x10 Bassman cabinet that I was covering”) or intentional, perhaps as a special order.
on a Bass-Master might indicate that the amp is from 1965 or 1966, before the four-digit serial numbers were used.
The circuit in [that amps] is built on a phenolic turret board instead of the Fender style fibre board used [later.] [...] it appears that Traynor/Yorkville used three digit serial numbers up until 1968.
In the fall of 1965, Fender switched from stamping these numbers in black ink, to dark green ink.
[An example is an] YBA-1A Bass Master Mark II [...] with the serial number M 601 [...] [whose] potentiometers date from 1968 [...] [and on which] 'Range Expander' is screened below the controls, not above.
are coded as follows s/n: 1020629 First digit: Last digit of year of production (1 ^= 1971, 3 ^= 1973) Second and third digit: Month of production (01 ^= Jan., 11^=Nov.) Last four digits: Numbered unit produced within that year?
It would be more accurate to say that approx 650 of each of these models were produced in ’60.
Oddlings – Yet another printing error has surfaced, this time from the FEI (pre-CBS) days.
Dating Fender Tube Amps by Serial Number, Part I by Greg Gagliano Copyright 1997, 20th Century Guitar Magazine. Well, we'll get to good parts, but first a little background information is in order.