and these changes are often disclosed and of a non-malicious nature.
Other things to look for include chasses placed in cabinets from a different year, “doctored” tube charts, non-original control plates (usually reproductions) on silverface amps, original transformer bell ends (they have correct date codes, of course) on non-original transformers, and non-original knobs (either repro or silverface knobs on blackface amps).unusual things can be found such as the empty “Pulse Adjust” hole on the rear of early ’60 brown amps, the “middle” volume control, use of tweed style grill cloth, strange non-documented transitional circuits, and changes in tolex color including the super-rare cream colored “brown” tolex that is found on some late ’60 amps. Given that people may refer to this information seeking specific production quantities of amps they are curious about, it should be pointed out that the serial numbers apply to chassis types, and not specifically to amplifier models.
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.
I promise the tables will still be there after you finish reading.
Additionally, Greg and Devin also had data that they had been collecting from Fender amps for years. Everything is confidential, we don't make record of who owns what amp in the database.
It reminds us more of a classic 80w Twin Reverb than a Bandmaster Reverb, and it shared its circuit design with the Pro Reverb and Super Reverb at that time.
The silverface Bandmaster Reverb is a typical ab763 amp and shares basic circuit design with the Super Reverb, Deluxe Reverb, Twin Reverb, Vibrolux Reverb, Pro Reverb and Twin Reverb.
Instead, there were approximately 2000 of these chasses produced, which then ended up as one of the three models in question.
It would be more accurate to say that approx 650 of each of these models were produced in ’60.
As usual the later silverface models were modified to become cleaner and more powerful.