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  • April 16, 2009 at 6:15 pm #78078
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    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" /]

    April 16, 2009 at 8:30 pm #95749
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    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 ?

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