Best Amp Settings for Classic Rock?
Here's some settings I've tried. None of them are your Orange 20, but you asked about bass, middle, treble, so here you are and good luck translating. I post this because you'll notice different guitars require different setings to sound similar with the same amp, and different amps require different settings with the same guitar to sound similar.
The Emery sounds like a Marshall on the edge of breakup, using an actual Tesla EL34 from my Marshall SL-X
The Wallace is handwired Marshall Plexi heaven - pick your guitar hero, this sounds like it
The HiWatt is Pete Townshend clean to breakup a la '67 Who Sell Out to '69 Tommy era
The SuperReverb is slide blues and Pete Townshend Who's Next type break up
This is for an SG with P90s. Bass rolled off is like a Marshall. Dime the bass and it's Black Sabbath.
This is for a vintage Strat. Notice the difference in presence and gain.
This is for a vintage Strat
This is for an SG with 498/490, everything hard rock from 1970 - 1990
This is for an SG with 498/490 set to sound similar to a Marshall
This is as loud as I can make it before I have to leave the room
The top AC30 sounds lilke early Beatle recordings, the bottom AC30 sounds like everything in the 1960's through U2
Now, armed with all that information, what should an Orange 20 be set to?
I learned a great lesson in the studio once. I was given the opportunity to play through a famous guitarist's Marshall. I leaned over to memorize the knob settings and the engineer waved me off and said, "Don't memorize the settings, memorize the sound. Your amp has different tubes and different circuitry and sounds different. Memorize that sound, then go figure out for yourself what knobs to turn on your amp to get that sound."