hi all ive Just picked up a JTM 60 in good condition for £50 ( yes i know how jammy i am lol)and iv been reading up on it and from what I can see every 1 is saying to add a fan to the underside of the power tubes to stop it over heating so iv fitted a pc fan 12v type but im not sure were to tap into to power it can any 1 give me a diagram or instruction on what to do thanks Gary Gilmour