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Vintage threads from the first ten years
ampeg guitar amp (hum setting)
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 6/9/1998 8:13 PM |
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dave Rohm |
ampeg guitar amp (hum setting) I recently bought an Ampeg VT 1xxx guitar amp and would like to know what the purpose of the red screw labeled hum on the back of the head is. sincerely Dave Rohm 6/9 |
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| 6/11/1998 8:58 PM |
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| richie hall |
This is a control to tke out the hum of the heater circut of the tubes through a 100 ohm pot. to ajust it,you should turn on your amp, turn up the volume,without your guitar plugged in.listen for the hum, turn the screw slowly to one side and back. the hum should get more and less, set where you hear the least hum.Some Fender amps have a hum balance control that does the same thing. They also have a output tube balance cotrol. Its supposed to match the output tubes by changing the bias,you set it the same way. roll the cotrol back and forth until the least hum is heard. I hope this healps you. |
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