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11-27-2018, 04:15 PM
Hi jmcd
Above, we were talking about the MV mod from The Ultimate Tone (TUT).
The LP-MV kit from London Power is a completely different scenario as there is no variable resistance working against the coupling cap, and thus there is no change of bass response with sweep. You might think then that there might be a varying interaction with the tube itself and there is because of the tube's internal capacitance. The effect here will be a treble roll-off, but it is at such a high frequency as to be inconsequential in a guitar amp. There can be a stability issue due to the wiring added to the grids, which is why grid-stops should be added, as The Ultimate Tone Vol. 4 (TUT4) shows, and as are included in the kits.
Above, we were talking about the MV mod from The Ultimate Tone (TUT).
The LP-MV kit from London Power is a completely different scenario as there is no variable resistance working against the coupling cap, and thus there is no change of bass response with sweep. You might think then that there might be a varying interaction with the tube itself and there is because of the tube's internal capacitance. The effect here will be a treble roll-off, but it is at such a high frequency as to be inconsequential in a guitar amp. There can be a stability issue due to the wiring added to the grids, which is why grid-stops should be added, as The Ultimate Tone Vol. 4 (TUT4) shows, and as are included in the kits.
