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I'm gonna rebuild the power board of my RM100 and while i'm at it i think i'll do a couple of mod on it. I'm researching a way to implement a switch that let me select between 4 power tube or one of the two pair; assuming we use mixed powertube it will have the option to chose wich pair to use...

Here's a mod for every Brit PCB (plexi, Sl+, Ultra etc.). What i've done is put 2 switch (spdt On/On) to add a gain boost and a "channel switching" between hotrodded plexi mode and hotrodded jcm800 mode. I tried to make it as simple as possible without cutting/rerouting traces on the pcb so it...