Dating guitar amp transformers dating younger womwn
It simply reflects the impedance load on the secondary back to the primary.
A transformer has a turns ratio which can be measured by putting an small AC voltage across the primary and measuring the resulting secondary voltage.
Fender installed casters on some larger amps and cabs beginning in 72.
There are several things that are important in getting an output transformer made.
The main parameters are: (a) the reflected primary impedance for a given secondary load impedance, which must match the needs of the particular tube being used, (b) the primary inductance, which determines the low frequency response, (c) the primary leakage inductance and capacitance, which determines the high frequency response, (d) the power handling capability, which determines the necessary core size and wire size, and (e) the mechanical details, such as the mounting style (upright "X" mount, laydown "Z" mount, etc.), the lead color and length, the use of end bells, the finish, shielding, etc.
An output transformer has no impedance by itself (ignoring primary inductance/resistance for the moment, which is a different subject).
Large leakage inductances can cause "ringing" at sharp transitions, such as a square wave generated by an amplifier driven into clipping.
In addition to high frequency response rolloff, the transient response of a transformer is affected by the leakage inductance.
The raised “Fender” grille logo lost its tail around 76.
There are exceptions to this rule like the the Bronco.
The code follows the format: XXXYY ZZ where: XXX = a two or three (possibly four on newer amps) digit number indicating the manufacturer.
(see chart below) YY = is a one or two digit code indicating the year.
Next, (if applicable) look for the date code on the tube chart.