Treble Bleed
Treble Boost
Parametric EQ
Low Pass Filter
Transparent Overdrive

https://www.fender.com/articles/tech-talk/how-a-treble-bleed-circuit-can-affect-your-tone

https://reverb.com/news/three-ways-to-nail-the-dumble-sound-on-a-budget

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Dumble Overdrive Special
Vox AC30 Top Boost
Fender 5E3 Deluxe
Mesa/Boogie Dual Rectifier
Marshall JCM800
Marshall 1959 Super Lead Plexi
Roland JC-120
Fender Twin Reverb
Fender Bassman
Hiwatt DR103
Peavey 5150