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Dating schumacher transformers

Since the new owner would have likely removed this tag immediately upon arriving home, I’m amazed that the one in the photo has remained intact since mid-1968!

Along with dating amps by serial numbers, we were interested in determining production totals, if possible.

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.

One has to wonder where all those factory original export back panels are! Another interesting tidbit is that a lot of Fenders were imported into Australia in the late 1950s and early 1960s that were stock 110-volt (domestic US) units.

The Australian Fender Distributor then installed 240V - 110V stepdown transformers in the bottom of the cabinets.

I have to wonder how often Fender used the SPEC check box and what features a “special” amp or cabinet would have?!Not only that, but to meet Swedish safety codes, Hagstrm removed the external voltage selector switch (fitted to all blackface and silverface export models) and hardwired it internally (see photos).Notice that the original Fender back panel was removed and replaced with a Hagstrm panel.I remember two 'suits' from upstairs standing behind me occasionally doing time studies.They actually held clipboards and stopwatches to measure how long it took for me to attach various parts.Of course I tended to hurry more when they were there, and I would fumble more, too.” Another really interesting fact was that he recalled that the eyelet boards were loaded/wired/soldered in Mexico!“I remember the circuit boards were pre-made, from Mexico, easy to screw into the chassis. When we had filled our cart we'd wheel it over to the Chicano chicks.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. 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.

712 comments

  1. Apr 23, 2004. Next, if applicable look for the date code on the tube chart. If your amp dosen't have a date code, flip the amp upside-down and check the transformers, and speakers for their manufacturer codes. If possible, open up the chassis and check a few of the pots' and capacitors' manufacturer codes. Remember.

  2. For example a transformer code of 606432, in a Blackface era Fender amp 1960's, would be Schumacher 606, manufactured in 1964 4 in the 32nd week 32 Another example a speaker code of 220820, in a Tweed era Fender amp 1950's – early 1960's, would be Jensen 220, manufactured in 1958 8 in the 20th.

  3. Oct 14, 2017. TRANSFORMER DATE CODES Another way to get a close estimate of when your amp was made is to read the codes on the transformers. 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 –. The first.

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