I have returned to double bass playing after 15 years,yes i am crazy but enjoying it!!
I use a yamaha BBT-500 head and two yamaha single 10 cabinets,my pick up is an underwood.The problem I have is that there is a loud hum when I use the Yamaha gear but through a friends polytone or an old peavey combo I have there is no hum,why is this ?I tried putting a piece of copper wire from the jack input earth to the ball end of the strings but it doesn't help.
PLEASE help this is driving me crazy!!!!
I just would like to say what a great resource this site is for bass players and that if it had been around when I first started I would be a much more informed and better player now!!(well anyway that's my excuse!!)