The MB805 are valve power monoblocks in a pure, fully triode single-ended configuration, designed and hand-built in the United Kingdom. They deliver 40 W per channel in Class A — enough power to combine the immediacy and intimacy of single-ended with real drive, especially with full-range, classic or simple-design loudspeakers.
The signal passes through a refined stage: 6SN7 valves drive a 2A3 valve in a choke-loaded arrangement, which in turn drives the majestic 805 output valve. An output transformer with a proprietary additional winding (LDT — Low Distortion Tertiary) and a large, choke-regulated power supply complete the design.
Each monoblock is entirely hand-assembled, point-to-point, using Japanese fine-grain transformer laminations, oxygen-free copper, Mundorf coupling capacitors and silver-plated PTFE wiring. A valve cage is included; upgrade options are available.
| Output power | 40 W per channel (Class A) |
| Valves | 1× 805 (output), 1× 2A3 (driver), 4× 6SN7 (preamplifier) |
| Operating mode | single-ended, fully triode |
| Sensitivity | 0.5 V |
| Signal-to-noise ratio | −90 dB |
| Damping factor | 10 |
| Frequency response | 20 Hz – 20 kHz (−1 dB) |
| THD distortion | <0.1% (1 W); 0.3% (8 W, 1 kHz) |
| Speaker impedance | 4 and 8 Ω |
| Power supply | 220 / 240 V (117 V possible); consumption 250 W |
| Dimensions (W × D × H) | 240 × 570 × 280 mm (with cage) |
| Weight | 36 kg (each monoblock) |
Single-ended valve power monoblocks on the 805 valve — 40 W of pure Class A, a 2A3 driver, LDT transformers, hand-wired assembly. Single-ended immediacy with real drive.
