Thanks! It’s always fun to make these vids. This one is new that I recorded earlier today but similar. This time mostly with MV turned all the way up because that’s how I think the NFB and presence knob is most discernible. That’s the way I run it most of the time too and just fiddle with the preamp volumes. To me, the first volume potentiometer seems to act more like a gain knob than a “Bright” Volume. If I re-made my front plate, I’d have it say Gain, Volume … and then on the farther left next to the Presence, Master Volume.That's super helpful, my friend. Thank you!!! BTW, I think I watched this one before, but your helpful description above (and a bit more time with the layout and schematic) make it even clearer. That's a nice range of sound options, and nicely demonstrated. Do I recall that's basically Rob's Bassman Micro with a 12AX7 in V1? I don't mean in every detail (nice switches!) but overall?
Anyway, nothing like sound and moving pictures to answer a question. Thanks again.
Can't help you there, but when I read the thread title my initial reaction was: Jocelyn, Brady, Nell ... and little Pookie.As everyone here knows by now, I'm working up plans to build an EF80 Bassman Micro as designed by our amazing friend @robrob. As many of you know, it has a 'preamp MV' and a (Type 3) post-PI MV.
View attachment 1000823
But how would you label their knobs? Plain ol' "Pre MV" and "MV"? Not very informative. I want short labels that'll fit on a crowded faceplate. Is there a single word that captures the essence of the preamp MV? Would you give the plain ol' volume knob a different name? Could the Type 3 have a better label than 'Master'?
Part of my problem, I admit, is this will be my first MV amp, but worse than that, I'm not smart about how they'll affect the sound. I get how the Type 3 works, but my whole concept of preamp v. power amp distortion is vague.
Keep in mind the PI Master should actually be hooked up at the junction of the grid leak and grid stop resistors, not the grid stop and coupling cap junction. The layout is different than the schematic. I would go with volume, gain, and master. I left out the pre amp master on mine, so I have volume and master. I might remove the master though and just have volume.