Sir query lang, I own an A55T integrated amp (EH 6CA7 tubes), Is it normal na may one clicking sound when ever I engage the Triode/Ultra linear mode coming from the speker, green to red light? If I turn the unit off with the red (Ultra or triode??) there is this pop (once only) sound in the speaker (Epos M15.2). Can you check your demo unit please. The previous owner said caps were upgraded to mundorf, almost a year with me na yung unit. Thanks