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Because whichever way you look at it you have to subtract something. You would need to bring the level of the 'OD channel' down so it would be a better match to the maximum clean available which is the essence of channel switchers. By doing so you would not get the same sound or harmonic contribution from the power amp when cranked. You could of course compensate by boosting gain in the preamp but at the end of the day you will end up with a different amp.ClubAndCountry wrote:SteveD, why wouldn't it work if it was built exactly as I described? Same amp, same sounds, just two different sets of pots with relay switching to engage whichever ones were in use. (OK, temporarily ignoring the problem of switching noise, but that's not impossible to fix.) If you can get two different sounds out of the same amp by manually adjusting one set of knobs, why can you not get those same two sounds by having two sets of knobs instead of one? All you're doing is electronically the same as having a roadie run over to the amp and turn the knobs... but much quicker and only having to kick it once :-).
frank9310 wrote:SteveD, I'm no electrician but trying to follow what you're saying and I understand what you mean about the dynamics differences between a single channel Plexi vs. amps with that lower line level feeds that make the amp sound too controlled and can't ever seem to go into raging dimed Plexi mode no matter how hard you drive them. I talked to my amp tech and he suggested these 2 things and wanted to bounce this off you to see if you had considered this or if it would be possible,.
However, what about the possibility of adding a cloned PPIMV with one for the low range and one for the high range and have those footswitchable by some kind of relay coming off the hi-low switch with maybe a cap and a diode and or shielding to help cut any popping sound from the relay?
SD: I suspect you would just end up reducing the master volume level of the High range only, in an attempt to get the two levels more like a dual channel amp. But the sound of the High Range would always sound like it does with lower master volume settings. Maybe this would work for you I don't know.
Or how about adding a 1 meg pot, the middle lug goes to the signal line on the input of the phase inverter. Then from one of the outer lugs on the pot (not sure which one) you connect it to a normally open contact on a relay then the other side of that normally open contact would go to ground. When the relay is energized, it puts the 1 meg pot in the cuircuit which will allow you to control the volume when in high range. When relay is denergized, the 1 meg pot is out of the circuit. To bypass the pot completely to stock, put an enable-disable switch in series with the relay coil.
What do you think?
SD: This will still have a significant affect on the sound as you would be reducing drive to a stage that contributes a substantial part of the sonic equation.
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