Marshall TSL100chat_bubble_outlineFrom real comments

The clean and crunch channels are consistently praised as the TSL100's strongest asset. Multiple owners single out the clean channel as pristine, versatile, and 'incredible,' while the crunch channel is repeatedly called a favorite for punk, hardcore, and classic rock tones. Several players describe the amp as their gigging workhorse for years, delivering huge, usable tones unboosted through 1960-series cabs, with some noting it competes favorably with JCM800s in the same aggressive tonal ballpark.

A widespread PCB defect causing bias drift and even amp failure is the amp's defining flaw. Numerous commenters report conductive tube boards on early units leading to hum, red-plating tubes, burnt PCBs, and even amps catching fire smells; several were quoted 200-250 euros/dollars by Marshall for repairs. Owners who installed Rev20 or Issue 20 replacement boards say the amp becomes rock-solid afterward, though some feel Marshall should have addressed this as a recall rather than a paid fix.

The lead channel, footswitch, and FX loop draw the most consistent secondary criticism. Several players find the stock lead channel thin or lacking sustain and mojo without EQ tweaking or a boost pedal, while the footswitch is called unreliable, requiring taping or replacement, and the FX loop reportedly introduces noise or volume drop for some users. Despite these gripes, most still keep and gig the amp regularly.