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Started by luke gibson, August 26, 2023, 05:30:26 PM
Quote from: Tassieviking on September 12, 2023, 02:15:33 PMI would guess its in the first couple of transistors in the preamp, TR1 TR2 TR4 TR5 is the most likely in my opinion.It would be easy to see if it is in the power amp or the preamp, if you turn the gain up all the way and leave the volume pot really low do you have distortion ?I like how you laid out the schematic, very easy to follow! If the amp distorts at low volumes then it is being generated in the preamp, if you get a clean signal with full gain and low volume then its most likely distorting in the power amp section.The preamp section goes up to the volume pot, and the power amp starts on the output of the volume pot, C18 is the first component in the power amp.CheersMick
Quote from: Tassieviking on September 17, 2023, 01:29:02 PMIt might be you have a different style of PCB, possibly an earlier or later version of the same amplifier.Marshall would release the same model but with several different layouts but basically the same circuit, they did however completely renumber all the components with several new revisions.If you have the same circuit you should have 2 47nF capacitors in there, C14 and C15.Can you find 2 47nF capacitors in there ?Can you find a 25uF capacitor on the PCB ?, there should only be one.If you can take some pictures of the top and bottom of the PCB I will see if I can trace your version out for you properly, the more pictures the better.If I can see the top and the bottom and then compare where the traces go to what component it's fairly easy to do.CheersMick