Bought a $500 Twins Audio Serenade pre-amp from a DIY seller / member through this site. It has mixed, non-labelled 'GE' tubes (3 Nos 5654 + 1 No 6AK5) , loosely-mounted volume control and serious hum heard throughout all output levels except when the volume is turned fully clockwise.
My appeal to other DIY experts - please advise how the hum problem can be reduced or removed. The seller refused to look at it except to sell me more expensive products. Thanks to all those who are willing to assist.
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