Members mlamarche Posted July 20, 2009 Members Share Posted July 20, 2009 I've been seeing some chatter about this subject...can anyone give a clue asto what it is...who makes these...is my JMP-1 one? Link to comment Share on other sites More sharing options...
Members methusalem Posted July 21, 2009 Members Share Posted July 21, 2009 Ok, let's break it down:In a "normal" guitar preamp within a head, for example an Epiphone Valve Junior, the preamp tube(s) run at rather high voltages. Again, let's take the VJ: in a stock unit, I think the unit runs at around 310V. Now in a low voltage guitar preamp, for example the ADA MP-1, use a starved-plate tube design. Voltages are much lower (below 100V), and therefore the tube behaves differently, namely more harmonics and distortion. A trade-off is less fidelity and often times less dynamics. You can usually tell by the size of the transformer. Puny transformer = cheap and starved plate, big transformer = expensive and high voltage. I don't specifically know about the JMP-1, but hats off to those engineers if they found a transformer to fit in there that puts out enough juice for a high voltage preamp. It's possibly though, since I seem to remember the Alembic preamps being high voltage? I hope I'm not wrong there... Anyway, hope that helped in understanding the subject. Link to comment Share on other sites More sharing options...
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