My Messy Marshall Tone Journey
Okay so recently I grabbed my old Marshall MOSFET Lead 100 from the back of the garage – truth is, this beast’s been collecting dust for ages ’cause last time it sounded kinda harsh, you know? Wanted to finally crack it.

First thing, plugged in my trusty old Les Paul copy – nothing fancy, just a workhorse. Powered it on, flipped the standby switch after warming up like you should. Straight away, classic Marshall noise! But yeah, way too bright and kinda thin sounding. Needed fixing bad.
Started fiddling. Treble knob was cranked near 10 from last time – way too much. Backed that sucker down to about 5. Instantly less like ice picks in my ears. Small win.
Next, the Middle knob. Was sitting around 4. Pumped that up to maybe 7. Big difference! Suddenly got that throaty roar Marshalls are famous for. Made the guitar sound thicker in the mix.
Bass knob was tricky. Had it on 6 initially. Sounded flubby when I dug in. Took it down to 4, then up a tad to 5. Found the sweet spot where it adds rumble without getting muddy.
Presence knob? Hate that thing sometimes. Was near max. Backed it right off to 3. Tamed the fizzy highs hiding behind the notes.

Now the big one: the Lead channel volume and Master volume. Was chasing more gain, cranked the Lead Volume way high, kept Master low. Wrong! Set Lead Volume around 7 for the grit, then pushed the Master up to 4.5 – 5. Boom! Way more power, way fuller sound without turning into mush.
What Actually Worked
After half an hour of knob twirling and swearing, here’s where I landed for a solid rock crunch that doesn’t shred your face off:
- Treble: 5 (keeps bite)
- Middle: 7 (adds that Marshally honk)
- Bass: 5 (enough thump)
- Presence: 3 (less ice pick)
- Lead Volume: 7 (good saturation)
- Master Volume: 4.5 (loud and proud!)
Oh, and the EQ slider switches? Middle one down, Bass one up. Seemed to help the overall chunk.
Honestly, the biggest pro tip is just experimenting like crazy. Start with everything at noon, pick a knob, turn it full up, listen, turn full down, listen, find where it sounds best. Rinse and repeat. Sounds dumb, but it works.
Tubes? Ha! Wish I had some NOS ones lying around, but holy hell are they expensive now. Maybe someday. For now, the settings tweak made it roar like it should. Took my crappy afternoon and turned it into a proper rock n’ roll time. Just turn those knobs!
