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Masterof1angel

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Question... What would cause my Mark IIC+ to hum when you push in the bass pull shift on the gain channel but not when you pull it out?
 
Signal to noise ratio, or most likely the preamp tube cathode assigned to that function is reacting to the increase in gain/voicing from the shift. Sometimes a slight boost in gain, even though clean or just a few dB's, can decrease noise.
 
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