Members Vasko Posted December 23, 2018 Members Share Posted December 23, 2018 Hi folks,i just bought this amp and first i have noticed when i turn knob for class A/B and A on back panel, some noise like hum appears. If i put knob between A/B and A position there is no hum. Also, there is push button on back plate for Tight and Loose. When i put on Loose, hum (like bass broom) appears and dissapears when back to Tight. Is this normal situation and if not how can i solve it. thank you very much Link to comment Share on other sites More sharing options...
Moderators daddymack Posted December 24, 2018 Moderators Share Posted December 24, 2018 sounds like it could just be a grounding issue between the back panel and chassis, but without an examination and a schematic, I can't tell. I would suggest taking it back where you bought it and show them what you are hearing.Or...live with the settings that don't hum.If it were me, I'd take it back. Link to comment Share on other sites More sharing options...
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