It's seriously mind boggling
Literally everyone on planet earth, who doesn't suck at guitar, and has had the chance to plug into a dimed plexi with some nice greenbacks or blackbacks
has done the "you really got me" G-A thing
and said "wow holy shit it's really that simple isn't it?"
then did twiddled with a delay pedal in front and done the arpeggiated A minor thing and thought "god damn, and there are crazy people out there who still think its 1998 on Harmony Central and this is some kind of mystery"
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Yes, if you starve the plate voltage you'll get closer
Yes, if you have a mighty mite whatever you'll get closer
Yes, if you have vintage 6CA7s you'll get closer
Yes if you super compress it on the way into an analog tape board you'll get closer
But those are all combined, like maybe 10% of the sound
A cranked plexi, good old celestions, and not fucking sucking at guitar are
easily 90% of the sound