It is too true. I love soldering and modding tube amps. But, the biggest signature of the sound is the sum of the speaker types/models/cones, the cab types, the mics, mic placements, mic preamps. The amp is more about dynamic reaction, style of distortion, and filtering out the desired harmonics and timbre. But, speaker response stands out as the most wide-ranging, and easily noticeable feature of the overall tone.
Knoppler, "Money For Nothing" studio parable:
"I remember Mark's Les Paul Junior going through a Laney amp, and that was the sound of 'Money For Nothing'," says Dorfsman. "We were actually going for a sort of ZZ Top sound, but what we ended up getting was kind of an accident. Mark would be in the control room and we'd run a lead out to the main area, and I remember getting a channel set up to monitor, heading out to the room to move the mics around, and Mark's guitar tech Ron Eve getting on the talkback and telling me not to touch anything because it sounded amazing as it was.
One mic was pointing down at the floor, another was not quite on the speaker, another was somewhere else, and it wasn't how I would want to set things up — it was probably just left from the night before, when I'd been preparing things for the next day and had not really finished the setup. Nevertheless, whether it was the phase of the mics or the out-of-phaseness, what we heard was exactly what ended up on the record. There was no additional processing on that tune during the mix.
Later on, we tried to recreate that guitar sound at the Power Station with the same amp, same setup and same models of microphone, but we could never get it. I'd drawn extensive pictures and had a little map of how everything was set up, but there must have been something weird going on to make the guitar sound that way in Montserrat, because in New York it sounded like a cleaner, karaoke version of the same thing. I messed around with it for a good couple of hours, but Mark was just getting bored and wanted to move on. The whole thing was very confusing."