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If you see any data that is not listed here or notice any errors, for 1970’s and earlier Fender amps, please send us an email and we will update the chart. I am trying to calculate mutual and leakage inductances in single phase trasformer as in attached file.This area is meant to be the cross-section of the coil such that the current density in bulk coil 2 is: J2 = n2*i2/a2.Looking at your geometry, the a2 area should be 9 mm * 61 mm, or 549 mm^2.For example, if you find pots from late ‘64 and transformers from early ’65, you can be pretty sure your amp is a 1965.The following chart, was originally printed in VG magazine, by Gerald Weber.The code follows the format: = a number from 1 - 52 indicating the week of manufacture.
First i evaluated the self inductance Ls1 = 290.6m H and Ls2 = 82.2 m H using A, J integral as explained in tutorial.
I have modeled this transformer with core EI having a cross section of 50x80 mm, 220 turns at the primary and 117 turns at secondary.