A 1971 Marshall Super Lead is played first WITH a bright cap and then WITHOUT it at a number of different volumes to investigate the influence of the Bright Cap (Capacitor). Removing or adding bright cap is one of the easiest and sometimes also most effective MODS you can do on a 100W Marshall. The Super Lead is played through a 1968 Marshall 4x12 model 1982A using a 1973 Fender Stratocaster.
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How does a Marshall Super Lead Amp work?
https://www.youtube.com/watch?v=c-VsonlY4tQ&t=320s
The Evolution of Marshall Super Lead
https://www.youtube.com/watch?v=e82Hg49zB7k&t=4s
Champ Vs Deluxe Vs Super Lead - Why do they sound different?
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The 10 most Classic Marshall Amp Schematics are THIS SIMILAR!
https://www.youtube.com/watch?v=10-gIlQr9ho