Unison Research · Preamplifiers
Reference Pre
Reference Pre is a 2-chassis valve preamplifier with line and phono stages, RCA and XLR connections, and selectable phono loading.
fig. 01 · preamplifiers
Reference Pre
From Unison Research
Reference Pre was developed as the control preamplifier for the Reference monoblock amplifiers. Its 2-chassis valve design includes line and phono sections, dual phono inputs, RCA and XLR connections, active tape and subwoofer outputs, and selectable resistance and capacitance for cartridge matching.
Specifications
| Type | valve preamplifier, dual mono, two chassis |
|---|---|
| Valves | 2 x 300B, 2 x ECC82, 4 x ECC83, 6 x 6C45P |
| Phono valves | 4 x 6C45P, 2 x ECC83 |
| Class | pure class A |
| Inputs | 4 RCA, 2 XLR, 1 tape, 2 independent phono |
| Output | 1 RCA, 1 XLR, 1 tape ( active ), 1 subwoofer (active ), Power-on link for REFERENCE Power |
| Output impedance | 500 ohm |
| Input impedance | 47 kOhm |
| Input impedance for Phono | Selectable resistance and capacitance |
| Preamplifier gain | 20dB |
| Phono gain | 45 - 55 dB |
| RIAA | passive ± 0.2 dB |
| Bandwidth | 10Hz - > 100KHz @ - 0.3dB |
| Negative feedback | 15 dB line, 0 db Phono |
| Distortion | 0.1% |
| Power consumption | 320 W max |
| Dimensions | 45 cm x 56 cm x H 22 cm |
| Weight | 30 Kg / 66 lb |
| Product type | valve preamplifier |