The Tone City TC-T37 Mad Stone Classic Germanium Diode is a Tone City fuzz pedal, currently around $79.80. Close alternatives include the Tru-Fi Rat Pack Compact and the Caroline Guitar Company Icarus. It pairs well with the Revv Generator 100R MkIII 3-Channel Head and the Peavey Classic 30 II 2-Channel 30W 1x12 Combo.
Tone City TC-T37 Mad Stone Classic Germanium Diode
Tone City · pedal
The Tone City Mad Stone is a budget distortion pedal built around germanium diode clipping. Germanium diodes clip at a lower threshold than silicon, so the voicing is softer, warmer and more compressed than a typical silicon distortion, with a rounded top end and a smooth, vintage-flavoured breakup rather than a sharp, cutting edge. It sits in a compact mini enclosure at an accessible price and is aimed at players wanting classic, warm distortion character without a boutique outlay.
- distortion
- germanium
- silicon
- vintage
- breakup
- clipping
- compressed
- diode
Good for
- Busking
- Live
Price updated Aug 28, 2026
Genres the Tone City TC-T37 Mad Stone Classic Germanium Diode is commonly used in
- Alternative
cited
Inferred from shared tonal signals, not a stated genre tag. - Hard Rock
cited
Inferred from shared tonal signals, not a stated genre tag. - Metal
cited
Inferred from shared tonal signals, not a stated genre tag. - Rock
cited
Inferred from shared tonal signals, not a stated genre tag. - Classic Rock
cited
Inferred from shared tonal signals, not a stated genre tag. - Punk
cited
Inferred from shared tonal signals, not a stated genre tag.
Amps that pair well with the Tone City TC-T37 Mad Stone Classic Germanium Diode
Revv Generator 100R MkIII 3-Channel Head
Revv
22% matchRun Revv Generator 100R MkIII 3-Channel Head after it and the bright edge settles into something more smooth
Peavey Classic 30 II 2-Channel 30W 1x12 Combo
Peavey
22% matchRun Peavey Classic 30 II 2-Channel 30W 1x12 Combo after it and the bright edge settles into something more warm
Ampeg V-4
Ampeg
tonal matchAmpeg V-4 pushes a high gain tone toward mid-forward
Gallien-Krueger Fusion 210
Gallien Krueger
tonal matchGallien-Krueger Fusion 210 pushes a high gain tone toward mid-forward
Orange Little Bass Thing
Orange
tonal matchOrange Little Bass Thing leans warm right where the bright tone needs it
Fuchs ODS II Custom 25/50 Combo
Fuchs
tonal matchFuchs ODS II Custom 25/50 Combo leans warm right where the bright tone needs it
Ampeg V4-B Head
Ampeg
tonal matchAmpeg V4-B Head's smooth balances out the bright tone
Harmony H650
Harmony
tonal matchHarmony H650 takes that high gain character and pushes it toward mid-forward
Pedals that stack with the Tone City TC-T37 Mad Stone Classic Germanium Diode
Spaceman Explorer 6-Stage Phaser
Spaceman
21% matchRun Spaceman Explorer 6-Stage Phaser after Tone City TC-T37 Mad Stone Classic Germanium Diode in the signal chain, clear of Tone City TC-T37 Mad Stone Classic Germanium Diode's own gain stage
Shin's Music Dumbloid
Shins Music
18% matchShin's Music Dumbloid pushes a high gain tone toward tight
Dunlop MXR Distortion Plus
Dunlop
17% matchWhere this leans bright, Dunlop MXR Distortion Plus answers back warm
Crazy Tube Circuits Golden Ratio
Crazy Tube Circuits
16% matchWhat Crazy Tube Circuits Golden Ratio brings here leans toward tight — that's worth building a pairing around
Boss DD-8 Digital Delay
Boss
15% matchBoss DD-8 Digital Delay's analog warmth voice goes after Tone City TC-T37 Mad Stone Classic Germanium Diode in the signal chain — it's not there to compete with Tone City TC-T37 Mad Stone Classic Germanium Diode's own germanium character — goes in the amp's FX loop (or last, into a clean amp)
Walrus Audio Bellwether Stereo Analog Delay
Walrus Audio
14% matchRun Walrus Audio Bellwether Stereo Analog Delay after Tone City TC-T37 Mad Stone Classic Germanium Diode in the signal chain, clear of Tone City TC-T37 Mad Stone Classic Germanium Diode's own gain stage — goes in the amp's FX loop (or last, into a clean amp)
Friedman Buxom Boost
Friedman
tonal matchFriedman Buxom Boost is voiced for a high-gain amp's front end — Tone City TC-T37 Mad Stone Classic Germanium Diode gives it exactly that
Fortin Amplification Tempest Overdrive Signature Architects
Fortin Amplification
tonal matchTone City TC-T37 Mad Stone Classic Germanium Diode leans into a high-gain amp's front end, precisely the platform Fortin Amplification Tempest Overdrive Signature Architects wants
Cheaper alternatives
Boutique & premium upgrades
EarthQuaker Devices Hoof Hybrid Fuzz
EarthQuaker Devices
71% similarityShared character: warm, bright, high_gain_settings
MXR Distortion+
MXR
70% similarityShared character: warm, high_end, distortion
Dallas Rangemaster Treble Booster
Dallas
69% similarityShared character: warm, bright, vintage_charm
EarthQuaker Devices Dirt Transmitter Rancho de la Luna
EarthQuaker Devices
69% similarityShared character: warm, aggressive_playing, high_gain_settings
Mythos Golden Fleece
Mythos
68% similarityShared character: aggressive_playing, high_gain_settings, distortion
Catalinbread Karma Suture
Catalinbread
67% similarityShared character: high_gain_settings, distortion, vintage_charm
Similar charactersee all similar tone character →
Tru-Fi Rat Pack Compact
Tru Fi
70% similarityShared character: aggressive_playing, distortion, vintage_charm
Caroline Guitar Company Icarus
Caroline Guitar Company
95% similaritysimilar tone character
Dunlop MXR M94SE Super Badass Distortion
Dunlop
95% similaritysimilar tone character
Catalinbread Silver Kiss MK2 2007 Reissue
Catalinbread
95% similaritysimilar tone character
Spaceman Charon GE/SI Hybrid
Spaceman
94% similaritysimilar tone character
Questions people ask
What are good alternatives to the Tone City TC-T37 Mad Stone Classic Germanium Diode?+
The closest matches in character are the Tru-Fi Rat Pack Compact, the Caroline Guitar Company Icarus, the Dunlop MXR M94SE Super Badass Distortion. Budget picks: TC Electronic Zeus Drive Overdrive. Boutique upgrades: EarthQuaker Devices Hoof Hybrid Fuzz, MXR Distortion+, Dallas Rangemaster Treble Booster.
What pairs well with the Tone City TC-T37 Mad Stone Classic Germanium Diode?+
Strong matches from rig and tone-complementarity evidence: Revv Generator 100R MkIII 3-Channel Head, Peavey Classic 30 II 2-Channel 30W 1x12 Combo, Ampeg V-4 — Run Revv Generator 100R MkIII 3-Channel Head after it and the bright edge settles into something more smooth.
How much does the Tone City TC-T37 Mad Stone Classic Germanium Diode cost?+
Around $79.80 (live listing price, updated Aug 28, 2026).