| Title | Value |
|---|---|
| Minimum power : | 2x 150W (RMS, 4 or 8 Ohm, 20Hz...20Khz at less than 0,1% THD) |
| Dynamic power : | 360W (IHF, 8 Ohm) |
| Continuous power : | 2x 160W (4 or 8 Ohm, 1Khz) |
| Power bandwidth : | 5Hz...50Khz (8 Ohm, 0,5% THD) |
| Frequency response : | 5Hz...100Khz (8 Ohm, 1W, +0 / -1dB) |
| THD : | 0,02% (100W, 1Khz) |
| 0,06% (100W, 20Khz) | |
| 0,02% (1W, 1Khz) | |
| 0,03 (1W, 20Khz) | |
| IMD : | 0,04% (8 Ohm, 100W) |
| Damping factor : | 80 (1Khz, 8 Ohm) |
| S/N ratio : | 100dB |
| Residual noise : | 0,3mV |
| High-pass filter : | 10Hz (12dB/oct.) |
| Inputs : | 775mV / 100kOhm |
| Outputs : | 1 pair (B-1) |
| 5 pairs (B-1 + UC-1) | |
| Componentry : | 4x 2SK77 V-FET (non-complementary) |
| 39 FETs | |
| 113 transistors | |
| 64 diodes | |
| 7 Zener diodes | |
| PC : | 440W |
| Dimensions : | 46 x 15 x 39cm (B-1) |
| 46 x 15 x 46cm (B-1 + UC-1) | |
| Weight : | 37kg (B-1) |
| 42kg (B-1 + UC-1) | |
| UC-1 METERS : | -50dB...+5dB (=0,001W...300W, 8 Ohm) |
| 150W = +2dB (±0,5dB) | |
| 10W = -10dB (±1,0dB) | |
| 1W = -20dB (±1,0dB) | |
| 0,1W = -30dB (±4,0dB) | |
| 0,01W = -40dB (±5,0dB) | |
| UC-1 cable : | RU-1 (5 meters) |
Yamaha B-1
1974
1980
Yamaha's other statement alongwith the NS-1000M.
Awe-inspiring, unbelievable sound, magnificent design - a true landmark.
Filled with 4 of Yamaha's 1st generation V-FET power devices : 2SK77, enclosed in bigger-than-TO3 cases.
Unlike the later B-2 or Sony's units, the B-1 doesn't use complementary pairs of devices, giving a more complex pre-driver circuit but making it easier to find matching devices.
Also available very briefly at the very end of the production run for a couple of markets in very very low numbers in silver color.
Complemented by the optional UC-1 controller which ads some fairly non-useful features like the ability to switch five pairs of loudspeakers at a distance or huge VU meters.
Never mind the meters - just plug the amp and enjoy.
Nudies aplenty at the indispensable amp8.com.
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