Who here has tried both? Or either if you want to share your results. It struck me today that we have the 1/4 power & 1/10 power attenuation mods using the big resistors on the back end to tame the volume. And there's the master volume mods - I tried the Pre P.I. master a few years ago and took it out that week, just didn't care for it. But I never tried the Post P.I. version. Anyway, I guess I'm asking "What differences are in master volume and speaker attenuation in these old circuits?" How close is the tone from one to the other? I was wondering that even if you didn't want an extra pot to deal with, couldn't you use a switch with set resistor values for a "1/2 power or 1/4 power" option, and how would that compare to using a resistor on the speaker end that has to be so much bigger and more expensive, and deal with heat sink, wattage, etc. How much are the non-LTP phase inverter Tweed amps driving the power tubes? Would a overdriven preamp and power tube Master be close enough in the end as an attenuator behind the power section and easier/safer in the end?