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.
Non-Schumacher transformers – It’s been universally accepted that Fender only used Schumacher transformers on amps made in the 1960s and 1970s.
There are some easy ways to find out when your vintage Fender was manufactured.
First, to get a general idea,there’s the appearance/style of the amp.
Oddlings – Yet another printing error has surfaced, this time from the FEI (pre-CBS) days.
Well, this universal “truth” was debunked when we found a bunch of amps with transformers made by the Better Coil and Transformers company.
Most post tweed Fenders had trannys manufactured by Schumacher.
They used a code like this: 606 – 645 The date is in the last three digits, after the 606 – .
First, it will be useful to you to understand the following five terms in order to choose the correct chart for dating your amp: refers to the two-tone woven fabric that covered many early amplifiers.
On early amps, this material was varnished to make it a more durable covering.