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R.
Eqd Speaker Cranker clone
Monte Allums TR-2 Plus mod kit
Trading feedback: http://www.thefretboard.co.uk/discussion/60602/
If you do need an emergency ground lift, it's very simple to just cut/unsolder the ground connection in the plug at one end of a standard guitar cable - make sure you mark the cable to avoid mistakenly using it as a standard grounded cable in future.
There is no danger in lifting a ground connection between guitar and amp - the worst that can happen is excess noise from an ungrounded guitar. Note that, in a two amp setup, one of the amps should still be connected via a standard grounded cable - the guitar still needs to be grounded to deal with rf noise.
Pressing the phase inverter will change the relative phase of the 2 input signals. It may well be that engaging this is causing the "hum" that is present on both inputs to "cancel out" - however, your guitar signal may well be impacted in the same way.
I've always found transformer balanced splitters to be a more reliable way of obtaining two signals that are isolated from each other.
RD Dualist and the Lazy J20 sound awesome together by the way
Thanks
Or, if there's room, cut the shield and resolder it with a 15 ohm resistor. Enough to stop ground loops, but better shielding.
Just cutting it back a bit is fine.
Thanks for the help