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Quad 33

Preamplifier

Relative price

below typical

Among the 29 preamplifiers in the catalogue, this one is below typical.

A band places a component against its peers and carries no price. It is deliberately the only price indicator on this page: a second one, measured against a different set, would narrow the two together far enough to give the figure away.

What it is

TILT control retained from original Quad lineage (familiar from Artera Pre and 34/44/606 preamps): single rotary that pivots the frequency response around 700 Hz to brighten or darken — gentler than conventional tone controls. Plus stepped bass control. Often cited by reviewers as a useful tool for older recordings.

Specs (manufacturer): Frequency response 20Hz-20kHz ±0.2dB. THD <0.0005% line/XLR; <0.002% phono MM/MC. SNR >108dB line/XLR; >82dB MM; >74dB MC. Output Z 120Ω (line). MM input sensitivity 3.2 mV @ 47kΩ/100pF; MC 460μV @ 100Ω/1.7nF.

Competition record

Assessed against 8 rivals across the sixty systems: it takes the slot in none of its 45 head-to-heads.

Where it gives ground

The dimension the engine names as the weakest link, counted across every head-to-head it lost.

  • quietness at rest ×60
  • low-level clarity ×11
  • vocal presence ×8
  • midrange truth ×3

Who it comes up against

Music First Audio Baby Reference V2

10 lost · Anchored, Artisan, Cavity-Native, Characterful, PRaT, Reference, Romantic, Silent Path

Against the Silent Path brief, the Music First Audio Baby Reference V2 keeps the slot decisively.

With the Audio Note P1 SE, the pairing gives up most on quietness at rest.

With the Whest Audio 60Se Pro, the pairing gives up most on quietness at rest.

On its own merits the Quad 33 is the weaker preamplifier for that brief.

had not heard a better preampStereophile (Art Dudley) — Baby Reference V1 review
had not heard a better preampStereophile (Art Dudley) — Baby Reference V1 review

Audiolab 9000Q

9 lost · Anchored, Artisan, Characterful, PRaT, Reference, Romantic, Silent Path

Against the Anchored brief, the Audiolab 9000Q keeps the slot decisively.

With the Longdog Audio P6100M Biamp 2x2 (4 units), the pairing gives up most on quietness at rest.

With the Musical Fidelity M8x Vinyl, the pairing gives up most on quietness at rest.

On its own merits the Quad 33 is the weaker preamplifier for that brief.

S/N exceeding 112dB A-weighted, THD <0.002%Audiolab 9000P/Q HomeTheaterReview specs + Audio Tailor review
S/N exceeding 112dB A-weighted, THD <0.002%Audiolab 9000P/Q HomeTheaterReview specs + Audio Tailor review

NVA P50 MKII

9 lost · Anchored, Artisan, Cavity-Native, Characterful, Intimate, PRaT, Reference, Romantic, Silent Path

Against the Anchored brief, the NVA P50 MKII keeps the slot decisively.

With the Audiolab 9000P, the pairing gives up most on quietness at rest.

With the Rega Aria Mk3 MM/MC, the pairing gives up most on quietness at rest.

On its own merits the Quad 33 is the stronger preamplifier — but it loses here on fit: the pairing with the Audiolab 9000P gives up quietness at rest under the Anchored weighting.

NVA P50SA MKII

8 lost · Anchored, Artisan, Cavity-Native, Intimate, PRaT, Reference

Against the Anchored brief, the NVA P50SA MKII keeps the slot decisively.

With the Longdog Audio P6100M (pair), the pairing gives up most on quietness at rest.

With the Rega Aria Mk3 MM/MC, the pairing gives up most on quietness at rest.

On its own merits the Quad 33 is the stronger preamplifier — but it loses here on fit: the pairing with the Longdog Audio P6100M (pair) gives up quietness at rest under the Anchored weighting.

pin sharp clarityNVA owner consensus (P50SA)
pin sharp clarityNVA owner consensus (P50SA)

Leema Neutron

4 lost · Cavity-Native, Characterful, Romantic

Against the Cavity-Native brief, the Leema Neutron keeps the slot decisively.

With the Leema Hydra II, the pairing gives up most on vocal presence.

With the Rega Aura Reference MC, the pairing gives up most on quietness at rest.

It sits well below the share of the budget this brief aims at the preamplifier position.

EAR Yoshino 868L (Line)

2 lost · Intimate

Against the Intimate brief, the EAR Yoshino 868L (Line) keeps the slot decisively.

With the EAR Yoshino 890, the pairing gives up most on midrange truth.

With the Rega Aura Reference MC, the pairing gives up most on low-level clarity.

On its own merits the Quad 33 is the weaker preamplifier for that brief.

warm, rich and detailed... never fatiguingHi-Fi Choice 2024 (reissue)

Exposure 3510 Preamplifier

2 lost · Artisan, Reference

Against the Artisan brief, the Exposure 3510 Preamplifier keeps the slot decisively.

With the Exposure XM9 Biamp 2x2 (4 units), the pairing gives up most on quietness at rest.

Audio Note M2 Phono

1 lost · Intimate

Against the Intimate brief, the Audio Note M2 Phono keeps the slot decisively.

With the Audio Note P1 SE, the pairing gives up most on midrange truth.

On its own merits the Quad 33 is the stronger preamplifier — but it loses here on fit: the pairing with the Audio Note P1 SE gives up midrange truth under the Intimate weighting.

warm, rich and detailed... never fatiguingHi-Fi Choice 2024 (reissue)

What the reviewers said

Quad 33 reissue preserves classic preamp lineage Quad 33 (2024 reissue) heritage· Tonal body
slightly warm... without fatigue Future Audiophile (Barrett) 2025 (reissue)· Tonal body
stable positions... three-dimensional Future Audiophile (Barrett) 2025· Spatial resolution
warm, rich and detailed... never fatiguing Hi-Fi Choice 2024 (reissue)· Harmonic texture

How it scores

Clarity

  • Spatial resolution 76 from listening evidence

Voice

  • Tonal body 76 from listening evidence
  • Harmonic texture 76 from listening evidence

Specifications

is balanced internalTrue
is dual monoFalse
has built in phonoTrue
phono typeMM/MC
rca inputs4
xlr inputs1
line input impedance kohm47.0
line input sensitivity mv100.0
rca outputs2
xlr outputs1
din outputs0
output impedance ohm1000
psu upgrade portFalse
headphone outTrue
internal bass managementnone
gain db14.0
notes