Found the problem the Ground lug that grounds the circuit board to the metal chassis is broken loose at the spot weld to the chassis, several of these lugs that hold the circuit board to the chassis with screws have come loose . :duh so this is a factory defect and I will be contacting Bugera to notify them.Even though my warranty is out this is sad ! I will fix it myself though. Thanks for the help. :tu:

OK here is what its doing. It squeals like crazy when I turn the guitar volume to zero and goes away when i turn the volume back to ten it also squeals if I touch the strings like Im completing a circuit if that makes sense. Its not my guitar or pickups they work fine in my other amp . It not like a regular audio feedback it almost sounds like one of them old time shortwave radios trying to be tuned in to different channels. : :loco

Thanks Enzo I'll try it and let you know.

Hello everyone hope some one can help . I have a Bugera V5 the problem I am having is loud high pitch sqealing Ive tried different tubes no change. the squealing changes when I adjust the volume or gain and it seems to go away when I put my hand on the strings. Im almost thinking its a grounding issue with the amp . Any suggestions?