Okay so I just did a little test
Guitar - StageClix - 5 watt tube combo.
Turned off wifi
With nothing plugged into the amp, volume on full - very faint almost inaudable background hiss that you would expect from a cranked valve amp
turn on the receiver, plug into the amp input (transmitter is off) - noise increases significantly
Transmitter turned on (tried both not plugged into a guitar, and plugged into guitar with volume all the way down) - Noise increases again.
Now to test my 10 foot cable. guitar volume all the way down, plugged into amp input - no extra noise whatsoever than when the amp is idle with nothing in the input.
Thoughts Tony?
thanks
John