I was using the vibrato channel

cream123

JustAskinologist
of and old blackface bandmaster, which I can't remember the year of. After probably 30 minutes of use I hear this deep rumble in the backround that goes along with the vibratos frequency changes. What's going wrong? Is this normal?
 
Re: I was using the vibrato channel

A deep rumbling motorboating sound is sometimes a cathode resistor going out...
 
Re: I was using the vibrato channel

Could also be the tube for the vibrato. I think its a 12 AT7. You will have to check to see, but a bad tube can sound pretyy similar also!
 
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