After doing a badly needed de-ox of pots and sockets, the formerly intermittent and scratchy Mesa MK II seemingly has plenty of power. However there seems to be a lot of what i'll call "white noise" or similar, even when the input jack is unplugged. The noise appears to be cumulative, getting louder as I turn the pots CW. Similarly, with all pots maxed CW, there is more noise when in the "lead" mode, than in the "rhythm" mode. Also switching V1 between the 12AX7 and the FET device makes only a nominal difference.
This is the first Mesa or similar high gain amp I have dug into. I did not swap any tubes or split the preamp and power amp...yet.
I am wondering how much noise is normal with the high gain type of amps?
How do you typically identify and quantify the noise with a scope? Thanks.
This is the first Mesa or similar high gain amp I have dug into. I did not swap any tubes or split the preamp and power amp...yet.
I am wondering how much noise is normal with the high gain type of amps?
How do you typically identify and quantify the noise with a scope? Thanks.
Comment