5/3/2023 0 Comments Marshall jmd 1 problem![]() ![]() Internally, the JMD:1 looks neat, well thought-out and should prove to be quick and easy to service. The same main board is used for 50- and 100-watt models, which have identical controls - the writing on the panel is simply flipped 180° to accommodate the combo's upside down chassis configuration.īoth main boards are up to a decently high standard, while practically all the wiring is terminated in push-fit connectors. However, this won't need to be done more than every couple of years with normal use.Ī second board behind the control panel contains the knobs, switches and logic stuff, as well as a daughter board for the amp's digital effects. Output valves are easy to get to but the single ECC83 driver valve is deeply recessed and will be difficult to replace. ![]() The power supply, output stage and preamp components are all on one large through-plated PCB, including the valve bases. "The JMD:1's overall voicing and character is not for the timid - this is a big, bold amp and benefits from being wound up loud." ![]()
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