I am pretty sure it is a fuse in the VK60. You will have to check them. Do you have anything that tests fuses?
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If the bias lights are out you probably blew the two fuses below the two left power tubes. Lift or carefully tilt the unit up so you can access the bottom, and remove the two fuse holders with a small screwdriver. Replace the fuses (I think they are 3A) and see if the unit functions. Have some patience, for the fuse holders can be difficult to replace in their recepticles.