Okay, I know you’re all just dying to skip ahead to the serial number tables but try to contain your excitement and read through the article first.
A 1957 tweed Vibrolux was reported with a tube chart printed with circuit “5E3” (tweed Deluxe) instead of the correct 5F11 (see photo).
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.
There are a number of resources available online to help you to date your guitar amplifier or bass amp.
Many of these resources refer to source-date-codes located on pots or speakers within your amplifier.
Non-Schumacher transformers – It’s been universally accepted that Fender only used Schumacher transformers on amps made in the 1960s and 1970s.
These are marked with EIA code “606” which is the company number for Schumacher.On early amps, this material was varnished to make it a more durable covering.Several different types, in vertical and diagonal weaves, were used.Some things are very obvious such as non-original or reconed speakers, non-original transformers, replaced pots, re-tweed, re-tolex, re-grill, etc.and these changes are often disclosed and of a non-malicious nature. Besides, no article in the Dating Fender Amps by Serial Number series would be complete without some interesting information, n’est ce pas?