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).This directory contains USENET articles Mic has saved about guitars, equipment, pickup, techniques, players, and so on.
Some amps have an QA inspection sticker inside the cab like the one shown below.
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Fender Fender Transformer Codes From BREME–(at)–Sat Jan 13 CST 1996 Article: 77538 of rec.music.makers.guitar From: BREME–(at)–(THOMAS BREMER) Subject: RE: Silverface Deluxe Rev Questions Date: 13 Jan 96 -0800 References: Newsgroups: rec.music.makers.guitar Organization: The Microsoft Network (msn.com) Lines: 34 Heres a quick way to date Fender amps (’60-82).
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.
I use this before buying a amp always-check all four transformers-will tell you if there has been problems along the way. On the bottom lower corner of the grill cloth was/is a 1×2 inch “JBL” plastic logo that Fender attached.