Andrea Del Signore wrote: that depends on how your cable is wired. i assume that your guitar is unbalanced, i.e. it has a 2-pin connection. phantom power works because pin 2 and 3 of an XLR connection are both 48v. if you connect your guitar to pins 2 and 3, both are at 48v potential, i.e. no current flows (hence "phantom"). but if you connect your guitar to pin 1 and either 2 or 3, then the 48v will cause a current through your guitar's electronics. if its impedance is high, no problem, but if it is significantly lower than a few hundred ohms, you will get a heat problem and possibly damage your equipment. both ways of wiring will work, but the 2/3 scheme requires balanced inputs, otherwise you will hear nothing. the mixer's phantom power should be short-circuit-resistant, so it will not take damage even while it's frying your external gear. but since most mixers should have a current-limiting resistor in series with the phantom power rail, most types of gear should be safe. i wouldn't bet on it, though.

Andrea Del Signore wrote: I was wondering whether it would be possible to remove the phantom power DC voltage with a fairly simple circuit rather than having to buy another preamp? This is really a question to others on the list who know more than I do about electronics, rather than advice. My thought was that all you need is an RC high pass filter, set at a frequency of maybe 1Hz or less, plus some kind of voltage limiting device to remove the positive and negative going pulses that would occur when you first connected or disconnected the circuit (a couple of zener diodes back to back in series?) What I'm saying is it might be possible to build a circuit with only a few components which would remove the DC phantom power coming out of the mixer and still allow the higher frequency audio signal from the guitar to get through. As I said though, I'm not confident enough with electronics to come up with a design that I would trust to work on somebody else's (presumably expensive) guitar, just wondering out of interest if this would work in principle. andy P.S. Having written this, I thought I'd check if something like this exists already. I found these two pages: http://www.blue-room.org.uk/wiki/Splitters http://www.blue-room.org.uk/wiki/Phantom_Power which suggest that you can remove phantom power from a cable using something called a transformer splitter.

Andrea Del Signore wrote: Just removing the ground (pin 1) connection from the mixer input XLR cable from the guitar should stop the phantom power from getting through.