[quote name='DHA' timestamp='1494257374' post='3294412']
won't be the tube, power supply every time. worst case is that someone has plugged a power supply in with a higher voltage than 12VDC and damaged the voltage doubler circuit and caused to to change frequency to something you can hear, seen that before.
[/quote]Yay the man himself thanks for the answer Dave so what do you think my best course of action should be thanks in advance and also do you know how much this will cost to fix as I might contact the guy I bought the unit from to see what he says Cheers