@montaldo you posted...
Take a piece of wire with a small piece of insulation trimmed at each end
- touch one end to the neutral collar of any RCA or XLR jack
- touch the other end to a ground point
IF the hum disappears then the neutral side of the pre-amp is not at ZERO volts.
This is common with components that have a two pin mains plug or a wal-wart power supply.
A SOLUTION...
- build a ground lead by attaching a piece of wire to the GROUND PIN ONLY of a mains plug
- attach the other end to the NEUTRAL ONLY of an RCA or XLR plug of the pre-amp
- plug the RCA/XLR end into any unused socket
- plug the mains plug into any outlet
Hope that helps - Steve
- Hums with any source, not volume dependent, still hums with no source components attached (I even tried unplugged them from the wall too). But the hum stops if preamp is disconnected from amps.Since the hum appears with the preamp only connected - try this...
Take a piece of wire with a small piece of insulation trimmed at each end
- touch one end to the neutral collar of any RCA or XLR jack
- touch the other end to a ground point
IF the hum disappears then the neutral side of the pre-amp is not at ZERO volts.
This is common with components that have a two pin mains plug or a wal-wart power supply.
A SOLUTION...
- build a ground lead by attaching a piece of wire to the GROUND PIN ONLY of a mains plug
- attach the other end to the NEUTRAL ONLY of an RCA or XLR plug of the pre-amp
- plug the RCA/XLR end into any unused socket
- plug the mains plug into any outlet
Hope that helps - Steve