David Gilmour's Hiwatt DR103 Amp Settings
David Gilmour's tone philosophy is built on maximum clean headroom. The Hiwatt DR103 — 100 watts, hand-wired, British engineering — provides a foundation so clean and so loud that it never saturates under the Big Muff's signal. All the dirt, sustain and warmth come from pedals; the amp remains transparent throughout.
The Amp: Hiwatt DR103
The Hiwatt DR103 is a 100-watt hand-wired British amp with exceptional build quality. It runs exceptionally clean at high volumes — its circuit topology provides more clean headroom than a comparable Marshall or Fender. This is precisely why Gilmour uses it: the Big Muff Pi at full sustain needs a clean foundation to produce its characteristic singing tone. If the amp is already saturating, the Muff's sustained fuzz becomes muddy and indistinct.
The DR103 has two channels (Normal and Brilliant), each with independent volume controls, plus shared Bass, Treble, Middle and Presence controls.
Exact Settings
Normal Volume: 7–8
Brilliant Volume: Off (or 0)
Bass: 5
Middle: 5
Treble: 7
Presence: 5
The Normal channel is the primary voice. The Brilliant channel adds treble presence — Gilmour keeps it off to maintain warmth. The treble at 7 provides the clarity needed for his single-note lead lines without brightness harshness. Bass at 5 keeps the low end controlled under the Big Muff's naturally bass-heavy character.
The Signal Chain
Understanding the Gilmour signal chain is essential for replicating his settings:
Guitar → Pete Cornish Buffer → Compressor → Big Muff Pi → [other drives] → Hiwatt → WEM 4×12
Key elements:
- Compressor (Demeter Compulator or similar): light compression, always on. Adds sustain and evening of dynamics.
- Big Muff Pi (Ram's Head or Russian variant): primary lead voice. Sustain at 3 o'clock, Tone at noon.
- Delay (in effects loop or after amp): 380–440ms for the primary echo, 160ms for slap-back. Critical for the spacious quality.
- Reverb: large hall reverb, moderate level.
Era-by-Era Settings
Wish You Were Here / Animals (1975–1977)
Ram's Head Big Muff, Hiwatt clean. Delay: 380ms approx, 3 repeats. This is the simplest and most accessible Gilmour setup. Big Muff sustain relatively high (2–3 o'clock), Tone at noon or slightly clockwise.
The Wall (1979)
More effects in play — chorus (Electric Mistress), multiple delays. Hiwatt settings unchanged. The addition of electric Mistress gives the chorus-heavy, atmospheric quality of the Wall solos.
PULSE (1994)
Updated rig but same philosophy. Hiwatt DR103 still the primary amp. Multiple TC Electronic delay units tempo-synced to the setlist. Pete Cornish custom switching board. The Comfortably Numb PULSE solo is the most widely referenced example of the full rig in action.
Comfortably Numb Solo Settings
The first Comfortably Numb solo (quiet, restrained) uses minimal Big Muff — guitar into light compressor into Hiwatt, with subtle delay. Tone: warm, controlled.
The second solo (full, sustained) uses full Big Muff:
- Big Muff Sustain: 3 o'clock
- Big Muff Tone: 12–1 o'clock
- Delay 1: 380ms, 3 repeats, 35% mix
- Delay 2: 160ms, 2 repeats, 20% mix
- Reverb: large hall, 25% mix
- Hiwatt Normal Vol: 7, Treble: 7, Bass: 5, Presence: 5
Replicating on Modern Amps
Fender Twin Reverb
The closest Fender equivalent — 85W, clean headroom. Set Volume at 5, Treble 7, Bass 4, Middle 4, Presence 5. Reverb at 2. Add Big Muff and delay pedals. Missing the Hiwatt's specific presence character but workable.
Hiwatt Custom Shop (current production)
Identical circuit to the originals. Most authentic option. Settings as above.
Reeves Custom 50
Hiwatt-circuit-inspired boutique amp. Very close to the DR103 character in a 50W format.
Modellers (Helix/Axe-FX)
Use a clean high-headroom amp model (AC30, Twin Reverb, or Hiwatt if available). Set Drive to 0, clean up the EQ. Add Big Muff and delay models in the signal chain. The interaction between the Muff model and the amp model's clean response determines the quality of the approximation.
Speaker Choice
Gilmour used WEM (Watkins Electric Music) 4×12 cabinets with Fane Crescendo speakers — efficient, clear, British character. Modern alternatives:
- Celestion G12H30 — closest Fane-adjacent speaker in current production
- Marshall 1960A/B with G12M Greenbacks — usable but slightly different character
- Fane Crescendo reissues — currently available from some UK suppliers
Why Clean Headroom Is the Whole Point
Most cranked-amp tones covered elsewhere on this site (Hendrix, Page, Angus Young) rely on the amp itself saturating — Gilmour's approach inverts that logic entirely. The Hiwatt DR103 is chosen specifically because it resists breaking up even at high volume, which means the Big Muff Pi's fuzz character stays clean and defined rather than blurring into the amp's own distortion. Stack a Big Muff into an amp that's already saturating, and the two distortion sources fight each other, producing a muddier, less controlled result than either alone.
This is the key principle for replicating this tone on any amp: the amp's job is to stay out of the way, not to contribute its own gain. A "better" amp in the conventional high-gain sense is actually the wrong tool here — clean headroom at volume is the actual requirement.
Common Mistakes
Choosing a high-gain amp because it seems like a natural pairing with a fuzz pedal. As explained above, this is backwards for Gilmour's specific approach — the Big Muff needs a clean platform to sound defined, and an amp that's already saturating muddies rather than enhances the fuzz's character.
Running the Big Muff with a low sustain setting expecting the signature singing quality. As the era settings show, sustain is typically set high (2-3 o'clock) across most eras — a conservative sustain setting produces a thinner, less sustained result than the recordings this tone is modeled on.
Skipping the compressor because its effect seems subtle. As the signal chain section notes, the light, always-on compressor evens dynamics and adds sustain before the signal even reaches the Big Muff — its absence is felt more in the overall smoothness and consistency of the tone than in any single obvious characteristic.
Using a single short delay instead of the layered dual-delay approach. As the Comfortably Numb solo settings show, the actual setup uses two distinct delay times (380ms and 160ms) simultaneously, not one — a single delay pedal, however well-set, produces a noticeably less spacious, less three-dimensional result than the genuine layered approach.
ToneStakr's Take
For players without access to a genuine Hiwatt, prioritize finding any amp with substantial clean headroom at real volume — a Fender Twin Reverb or a quality modeller's clean amp model — over chasing the exact Hiwatt circuit. The clean-platform-plus-Big-Muff relationship is doing more of the recognizable tonal work than the specific amp brand, and getting that relationship right matters more than sourcing period-correct Hiwatt hardware.
Frequently Asked Questions
What is Gilmour's Hiwatt Normal channel setting?
Normal Volume 7-8, Treble 7, Bass 5, Presence 5, with the Brilliant channel volume off entirely. The DR103 is run conservatively clean throughout — all the dirt and character comes from the pedals ahead of it, not the amp itself.
What speaker cabinet does he use?
WEM 4x12 cabinets loaded with Fane Crescendo speakers — an efficient, clear, distinctly British-voiced speaker. A Marshall 4x12 loaded with Celestion G12H30 speakers is a reasonable practical substitute, though not tonally identical.
How do I get the "Comfortably Numb" solo tone specifically?
A Big Muff Pi (Ram's Head type, sustain around 3 o'clock, tone at noon) into a genuinely clean Hiwatt-style amp, followed by a long delay (roughly 380ms, 3 repeats) and a subtle hall reverb. The second, more sustained solo section pushes the Big Muff harder than the first, more restrained section.
Can a Fender Twin Reverb substitute for the Hiwatt?
Yes, reasonably well — it offers comparable clean headroom at volume, which is the essential quality this tone requires. It lacks the Hiwatt's specific presence character and British voicing, but it's a workable substitute for most practical purposes.
Why does the Big Muff sound different into a clean amp versus a driven one?
Because the Big Muff's own fuzz circuit already provides a complete, shaped distortion signal — feeding it into an amp that's also distorting adds a second, less predictable layer of clipping on top, muddying the note definition and sustain character that make the Muff-into-clean-amp combination sound singing and controlled rather than chaotic.
Is the specific delay timing (380ms and 160ms) important, or can I use a single delay pedal?
The layered dual-delay approach genuinely contributes to the spacious, three-dimensional quality associated with this tone — a single delay pedal, even at a well-chosen setting, produces a flatter, less dimensional result than the two simultaneous delay times used in the actual setup.