Members rdpar Posted September 24, 2010 Members Share Posted September 24, 2010 What are the tubes in a Marshall JMP master model 50w MK2 lead head? Link to comment Share on other sites More sharing options...
Members charveldan Posted September 24, 2010 Members Share Posted September 24, 2010 Three 12AX7 pre-amp tubes.........for power tubes they either have two EL-34's or two 6550's. It's important to have a service tech "bias" the power tubes properly, you can't just swap them out. Link to comment Share on other sites More sharing options...
Members rdpar Posted September 24, 2010 Author Members Share Posted September 24, 2010 But you can swap them out with no problem as long as your tech rebias' them? Link to comment Share on other sites More sharing options...
Members El Guapo Posted September 24, 2010 Members Share Posted September 24, 2010 But you can swap them out with no problem as long as your tech rebias' them? That's correct, there might also be a need to add or remove resistors when switching from EL34's to 6550's and vice versa. Don't quote me on that though, I've only read about that mod. You can also try and DIY (do it yourself), if you're up to the task, with a multimeter or weber bias rite. Link to comment Share on other sites More sharing options...
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