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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