My right channel sounded less lively and tiny bit less lound on a number of records. So I swapped the tubes left and right. It is a 300B SET amplifier and now the left channel had this kind of laziness to it. One of the tubes where laziness is observed has small burn out stripe at the very top.
One channel gets very quiet after bias is adjusted
I have SET Antique Sound Lab amp, when I turn the bias pot all the way clockwise, one of the channels gets very quiet The other channel gets louder and punchier. The tubes are from a pervious owner. Are these tubes possibly unmatched or one of them is bad?