THD® is a registered trademark of THD Electronics Ltd. JET CITY AMPLIFICATION 333® is a registered trademark property of 333 Enterprises Incorporated DBA Jet City Amplification Corporation. GALLIEN-KRUEGER® is a registered trademark of Gallien-Krueger Corporation. GROOVE TUBES® is a registered trademark of ROKR Ventures, Inc. SEYMOUR DUNCAN® is a registered trademark of Carter Duncan Corporation. ORANGE® is a registered trademark of Orange Music Electronic Company Ltd. FENDER™ and all FENDER amplifiers, logos, and trade dress are the trademarks of FMIC and used herein under license. MESA/Boogie® is a registered trademark property of MESA/Boogie Limited Corporation. Marshall® and the Marshall logo are registered trademarks of Marshall Amplification Plc. AmpliTube®, TONEX®, AI Machine Modeling™, ToneNET™, SVX™, X-GEAR™, X-DRIVE™, X-SPACE™, X-TIME™, X-VIBE™, VIR™, DIM™, DSM™, VRM™, are trademarks or registered trademark property of IK Multimedia Production Srl. If you are building a clone from a Mesa schematic, you should be aware that the schematic will not represent the current models, and you should be prepared to spend time de-bugging and analysing the amp stages, and you might find that the switching does not work as it should. I have seen apparent errors or typo's in the switching matrix of early Nomad and Dual Recto amplifers, switching circuits of the V-Twin pedal, and gain stage, FX loop and reverb send circuits of Mk2C and Mk3 amps. If these are among the components that have failed, the tech must analyse that part of the circuit and make a judgement as to what values to use for the repair - or contact Mesa support, if they are an authorised tech / repairer. When servicing a Mesa amp, it's fairly common to find a couple of preamp plate resistors, cathode bypass caps, interstage resistors and/or caps that are different from the schematic. The schematic that is released can be obsolete already due to the manufacturer making changes after the product launch to fix design problems (following user and service tech feedback), respond to endorsee requests for gain or tonal changes, add extra features or even just to claim it's a new, updated model. This is fairly common among manufacturers, probably to give them time to launch the product, get a profile in the marketplace, get favourable reviews, sell as many amps as possible before the cloners and competitors copy them, etc. Mesa schematics usually take around 3 years to be released to authorised techs after the product is launched. I have found some errors and discrepancies in Mesa Schematics while repairing Mesa amps over the last 20 years,Īlthough I couldn't say whether they are intentional or not. Okgb wrote:Just curious to see it, but can anyone point out some examples of mistakes
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