Consonance Cyber 880 A
Eight-valve 2A3 triode power amplifier, delivering 30 watts per channel with switchable 4 or 8 ohm outputs.
Description
The Cyber 880A is a valve power amplifier, built around eight 2A3 triode valves paired with 12BH7 and ECC82 driver tubes. It operates via a simple on/off switch and receives the signal through a single RCA input.
Output power reaches 30 watts per channel RMS at 1 kHz, with total harmonic distortion below 1% at 20 watts. The frequency response spans from 5 Hz to 85 kHz (-3 dB points, measured at 50 watts), and the signal-to-noise ratio reaches 90 dB, reflecting low electrical background noise. Output impedance is selectable between 4 and 8 ohms, via dedicated matching taps, allowing the amplifier to be matched to different types of speakers. Overall negative feedback is deliberately limited, a design choice typical of valve amplifiers seeking a certain sonic transparency.
This type of amplifier is aimed at valve sound enthusiasts wishing to drive moderate-impedance speakers without seeking high power, favouring instead the character and sonic texture typical of triode output stages.
Technical specifications
| Control function | On/Off |
| Output power | 30 W x 2, RMS 1 kHz |
| Total harmonic distortion | < 1% (20 W, 1 kHz) |
| Frequency response | 5 Hz-85 kHz (-3 dB at 50 W) |
| Input sensitivity | 850 mV |
| Input impedance | 100 k ohms |
| Output impedance | 4, 8 ohms (selectable) |
| Signal to Noise | 90 dB |
| Power consumption | 300 W x 2 |
| Input interfaces | 1 group (RCA) |
| Overall negative feedback | Small |
| Vacuum tube | 2A3 x 8, 12BH7 x 2, ECC82 x 3 |
| Dimensions (H × W × D) | 190 x 450 x 430 mm |
| Weight | 35 kg |
What to check before buying used
On an amplifier with eight 2A3 power valves and three driver tubes, the condition and matching of the valves directly affect sound quality: it is advisable to check the wear of each valve and the balance between channels via the built-in bias meter. The tube adjusters should allow smooth adjustment, with no play or sticking. The power supply capacitors, stressed by the 300-watt-per-channel consumption, also warrant inspection, as should the cleanliness of the RCA contacts and the 4/8 ohm output terminals.
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