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Home › Forums › Help/Technical Questions › 12ay7 hum
I’m getting some hum from 12ay7 preamp. I’m using balanced emu 1010m sound card. The sample below was recorded with output level turned completely down. Is this amount of hum normal ?
[audio src="http://mmw.velcomweb.ca/del/hum.wav" /]
Later on, the hum subsided in about a half. After installing two matching mullard tubes the hum went way down: http://mmw.velcomweb.ca/del/humMul.wav
Were the original Russian tubes problematic ?