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W.r.t. question 1, any distortion you hear with master up and output down will not be power valve distortion. You can only achieve that with volume (i.e. master up AND output up). What you’re hearing is probably the fx loop send preamp valve distorting. Having said that, it can still be a...

Find a (real) Mullard ECC83 and stick it in V1. That alone will solve most of your problems with the tone. To de-clutter your mid range even more I recommend regular Chinese (Shuguang) 12ax7-b in v2 and v3. They have a controlled low and high end, with a nice defined mid range. For v4 you can...

I don’t use a boost, and I don’t really miss one. The multi watt definitely needs it less than the older 3ch. My ch3 settings are: modern|bold|diode presence: 9:00 master: 10:00 gain: 1:30 bass:7:30 mid: 10:00 treble: 12:30 Few things to note: 1. The channel master is actually a powerful eq...

I got the same problem on my 90w Mark V, with the preset eq depth turned up on ch1, but eq not activated, I will get the crackling/breakup noise over what is otherwise a perfectly clean sound. I have to keep the ch1 preset depth at 0 to stop the noise. seems like a design/component flaw if...