For some models like the blackface Concert, there was no change in phase-inverter resistor values, and no changes in tone stack cap values fascinating! The model was supposedly discontinued in The reissue amps also made use of this code. Just remember that if you're interested in production from a "family" model listed above, you cannot use this method. Like I said, there were 5 or 6 of us at the benches every day. I just discovered that the silverface Bandmaster speaker cabinet the big, tall one without tilt-back legs is ported see photo. He recalled, "We just went to a big bin every morning and loaded our wheeled rack with a batch of whatever chassis we were working on that day. Each side of the cabinet was made from several pieces about three or four inches wide, glued side-to-side, to make up a plank the depth of the cabinet. Unlike serial numbers used for most Fender guitars and basses, we know that serial number sequences are unique to a particular model or a family of models of amplifiers. Remember, this model shares a chassis with the narrow panel tweed Pro and Super. This two-letter production stamp continued in when Fender began reissuing Fender Bassman Amplifiers. The tube chart indicated the AA circuit, but there were some very strange original resistor values inside. For the uniquely serialized models, the production estimates using my hypothesis, can be determined from the serial number tables. The code follows the format:
The boss came around and said what we'd be building. These laminated cabs were not finger joined, but rabbet joined. These are marked with EIA code "" and are most prevalent during the time period. From circa to the early s, the cabinets were no longer made from solid pine boards, but cheaper laminated, multi-piece pine boards. I will present my hypothesis here and let Greg present his side of the story in a future article. One of the most common topics that falls into this category is early silverface amps. And with Fender, there are always exceptions to the rule. For instance, he confirmed our assumption that the amp chassis were put into stock after being stamped with serial numbers and that the chassis were pulled from the stock bins randomly just as with Fender guitar neck plates. You'll still need to look at various features and date codes to absolutely confirm a year of manufacture. When we had filled our cart we'd wheel it over to the Chicano chicks. Well, the serial numbers for the brown Vibroverb run from to indicating a total production of around units, and the serial numbers for the blackface Vibroverb run from A to A indicating a total production of around 5, units. Here is a cool link to a Vintage Fender Amp price history chart that tracks sales data for specific amp models by the month. The only major difference in tone between the two circuits would be attributable to the different tone caps. Thankfully, these aberrations are pretty rare. I promise the tables will still be there after you finish reading. Remember, many components could have been changed over the years, speakers blow, caps dry out, transformers melt down, and pots wear out. I remember two 'suits' from upstairs standing behind me occasionally doing time studies. The warm tube sound was introduced in when the first Bassman model was designed for Fender Precision Bass guitars. The chassis weren't used chronologically. The tube chart indicated the AA circuit, but there were some very strange original resistor values inside. An interesting feature on the tweed-style cabinets is the use of a dowel reinforcement in the top on either side of chassis. The "universal" changes do seem to be the oscillator circuit, cathode resistor change from 56K to K, and the addition of the ohm grid stopper resistors. He recalled, "We just went to a big bin every morning and loaded our wheeled rack with a batch of whatever chassis we were working on that day. Non-Schumacher transformers - It's been universally accepted that Fender only used Schumacher transformers on amps made in the s and s. And for other models, the tone stack did not change from.
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