Hmmm....well, I never noticed a transient spike, but my playing is very disciplined, most likely from so much unplugged practice. I had an engineer comment once, as he was viewing the spectragraphic analysis of one of my tracks, that it looked like I was playing with a compressor.
I run volume and tone full-up all the time. It's very rare for me to turn the guitar down because it loses presence and gain.
I am sure 50's wiring is all well and good, but unless you are turning the tone down, the capacitors are not doing anything.
The variations in capacitance may create some different tones, but again, if you dime-out the pots, as I always do, then it makes no difference.
In the Hotel California video I posted, I think the tone is worth examining...
The guitar is dimed-out, the gain on the DSL40C is 1/2, Bass is 8, Mid is 1/2, Treble also 1/2, and Presence and Resonance is also 1/2 way up.
I never change these settings, so even if I am playing Hotel California or AC/DC, I simply change my attack which changes my tone.
I use the same amp settings for songs like "Smoke Rings In The Dark" and the tone sounds almost clean....