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@FatManOnAFixie
'Buzzy' feeling, it could also be the fact that if neither the Amp or the TV are earthed (fitted with a 3 core mains cable) the 'floating' design of the PSU in the TV is causing the casework of the amp to 'sit' on an AC voltage.
I've had this happen to me when I fitted a DC power supply to a Bass Guitar effect pedal/looper. The PSU was purposed for an Iomega Zip drive (5V at 2A or so). What I didn't realise is that DC level was sitting on an AC level of ~55V or so! I got a tingle (buzzy feeling) whenever I brushed against anything that was proper grounded.