![]() Having said this, there are a lot worse guitars out there, and as well as being historically important, the 1820 bass can certainly provide the goods when required. Here is what the AB763 looks like: Here is what the AA763 looks like: Here is what the AB763 plate load resistors on the layout look like (the plate load resistors are the 100k and 82ks): Then the AA763: Notice the 82k resistor that got added. Over the course of the 70s, the Japanese output improved dramatically, and in many ways these early 70s models are a low point for the brand. These new Epiphones were based on existing Matsumoku guitars, sharing body shapes, and hardware, but the Epiphone line was somewhat upgraded, with inlaid logos and a 2x2 peghead configuration. Maybe not as famous as some of the other Fender amps, but the modeled Bandmaster with the AB763 circuit is considered to be another holy grail Fender. I have never played it hard and its good to go. Excellent condition.It has the classic Fender tube amp sound in abundance, but it is too loud for my current needs. The Matsumoku factory had been producing guitars for export for some time, but the 1820 bass (alongside a number of guitar models and the 5120 electric acoustic bass) were the first Epiphone models to be made there. Examining the Dumble links posted on Schematic Heaven, I noticed the 70's circuits were very similar to an AB763 Fender, sans tremolo, and comparing them to the Bandmaster layout, it made the most sense to sacrifice the farmost-right preamp stage of the Normal channel for the new Overdrive, while leaving the original Level pot in place but. This is a 1968 Fender Bandmaster guitar amplifier head, silverface, drip-edge with AB763 circuit same as blackface as far as I know. I know what I like to hear, but I am still in the early education of the technical side of things.By the end of the 1960s, a decision had been made to move Epiphone guitar production from the USA (at the Kalamazoo plant where Gibson guitars were made), to Matsumoto in Japan, creating a line of guitars and basses significantly less expensive than the USA-built models (actually less than half the price). So my questions are: How different are the Vibrato channel of the Bandmaster and the Normal channel of the Bassman apart from the vibrato (tremelo)? Would it seem that the Bandmaster needs to be retubed, or would it be a deeper problem than that? I thank you all in advance for your help. Vintage 68 Fender Bandmaster Tube Guitar Amplifier Head AB763 Circuit. The Band-Masters solid state rectifier offers up a little less voltage sag than the Pros tube rectifier so its tone is a little more tight and punchy with a. I had the Bandmaster rebuilt about 5 years ago and the Bassman rebuilt about 2 years ago. This vintage 1968 Fender Bandmaster head is I great shape for its age. But with a 1964 Bdmstr, you probably have a AA763 or AB763 but I would check and make sure someone didnt play with it. The bassman seemed more aggressive and much louder than I remember the Bandmaster ever being. Also, if I remember correctly, Bandmaster Reverbs do not have the exact same circuitry as Blackface non-reverb Bandmasters because of the extra reverb gain stage (i think its 1069 or 1096 or something like that). (I should mention that I play the Bandmaster on the Vibrato channel.) I plugged into the Normal channel of the Bassman and Holy cow, there I was. Bassman 135, Dual Showman 135, Quadraverb 135, Super Size Reverb 135, Twin Reverb (Silverface), Twin Reverb 135 (Silverface), Vibrasonic Reverb 135. So I grabbed the Bassman and plugged that in. Fender 135 Watt Silverface Twin Reverb Output Transformer. It sounded a little comb filtered and just wasn't reacting to my playing. It was lacking attack and punch.I don't know, hard to explain. So last night at practice my Bandmaster just wasn't feeling or sounding "right". ![]() From what I understand the silverface bassman is still the blackface circuit. My guitar amp is a 1965 "AB763" Bandmaster and my bass amp is a 1970 "AB165" silverface bassman.
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