Guitar FX Layouts: Sunn Model T (1st Gen) Preamp - Blogger Sep 05, 2016but, comparing the tonal changes, the model t is heavier and thicker then the plexi ever was, and has loads of bottom end without being muddy. i had trouble finding any videos of the amp without pedals running through it, but when i think sunn model t i think doom metal, just loads of thick, heavy tones, with creamy distortion that is still clear. model t amp | eBay SAMS PHOTOFACT FOLDER MANUAL & SCHEMATIC AMP THORDARSON MODEL T-31W25A . Pre-Owned. $9. or Best Offer +$2 shipping. SPONSORED. Blue DO NOT PASS Blue Metal Flake Shift Knob model t amp 428 bert racing amc rzr. Brand New. $35. Buy It Now. Free Shipping. SPONSORED. Blue Determined Blue Metal Flake Shift Knob g force rzr model t amp classic.