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Post subject: A little AB763 history
Posted: Wed Jul 30, 2014 9:27 pm
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This is an excerpt from a forum outside the Fender website. Feel free to correct the author here for clarity's sake:

Kxyz, you have a Bandmaster AB763. That circuit was drawn in July of 1963 and was indeed the second version. The first was the AA763, which was also drawn in July '63. The second letter of that designation indicates this....AA is the first, AB is the second.
BF/SF circuit designations do not indicate the amp model, so it is best to include that info as Bandmaster AB763, Deluxe Reverb AB763, and so on. There are great simularities between the Bandmaster, DR, SR TR circuits; but the 'AB763' does not mean that the exact same circuit was used on all of these amps. They were simply drawn and introduced in the 7th month of 1963. To complicate matters with BF and SF amps, you can have an incorrect tube chart during transitions. That is, there are SF Bandmasters out there with AB763 tube charts in them despite having the May of '68 circuits in them. Fender did not waste tube charts....they used them even if they were not correct.


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Post subject: Re: A little AB763 history
Posted: Wed Jul 30, 2014 10:10 pm
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Lynn Nicholson wrote:
To complicate matters with BF and SF amps, you can have an incorrect tube chart during transitions. That is, there are SF Bandmasters out there with AB763 tube charts in them despite having the May of '68 circuits in them. Fender did not waste tube charts....they used them even if they were not correct.


Throughout all of its entire production run, the tube array for the blackface and silverface Bandmaster never varied. The same holds true with most of Leo's other designs save for the rectifier in those models that relied on a tube for that function. CBS-era tube charts for the tube-rectified models acknowledged this singular difference.

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"Here's why reliability is job one: A great sounding amp that breaks down goes from being a favorite piece of gear to a useless piece of crap in less time than it takes to read this sentence." -- BRUCE ZINKY


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Post subject: Re: A little AB763 history
Posted: Wed Jul 30, 2014 10:12 pm
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Lynn Nicholson wrote:
This is an excerpt from a forum outside the Fender website. Feel free to correct the author here for clarity's sake:

Fender did not waste tube charts....they used them even if they were not correct.
?


The circuit printed on the chart may not be correct, but the tubes & alignment usually are correct. Most other parts of the answer is correct.


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