| Title | Value |
|---|---|
| POWER section | POWER section |
| Output : | 2x 140W (20Hz...20Khz, 4 Ohm) |
| 2x 100W (20Hz...20Khz, 8 Ohm) | |
| Frequency response : | 0Hz...100Khz (+0 / -1dB) |
| 10Hz...100Khz (+0 / -1dB) | |
| Bandwidth : | 5Hz...100Khz (-3dB, THD 0,5%, 8 Ohm) |
| Phase rotation : | +0...-30° (10W, 0Hz...100Khz) |
| THD : | less than 0,08% (rated power, 8 Ohm) |
| less than 0,01% (50W, 8 Ohm) | |
| less than 0,008% (10W, 8 Ohm) | |
| IM : | less than 0,03% (50W, 4 Ohm & 8 Ohm) |
| Damping factor : | 70 (8 Ohm / 20Hz) |
| 70 (8 Ohm / 1Khz) | |
| 50 (8 Ohm / 20Khz) | |
| S/N ratio : | 110dB |
| Residual noise : | 0,25mV |
| S/N ratio : | 115dB (IHF-A, input short-circuited 4,7kOhm) |
| Input : | 775mV / 25kOhm |
| METERS section | METERS section |
| Display range : | -50dB...+5dB |
| (0dB = 8 Ohm or 0dB = 0dBm) | |
| (= 0,01W...300W for an 8Ohm load) | |
| Accuracy : | +5 to -20dB : ±1dB |
| -20 to -40dB : ±2dB | |
| -40 to -50dB : ±3dB | |
| Frequency response : | 20Hz...20Khz : ±1dB |
| Rise / decay time : | 100µs / 1s. |
| GENERAL | GENERAL |
| Componentry : | 8 V-FETs |
| 4 FETs | |
| 95 bipolar transistors | |
| 2 ICs | |
| 66 diodes | |
| Dimensions : | 43,6 x 15,1 x 37cm |
| Weight : | 26kg. |
Yamaha B-2
april 1976
1980
preliminary
The other monster V-FET power-amplifier, coming a year after the original non-complementary B-1, powered by a set of four complemementary pairs of parallel connected 2SK76 & 2SJ26.
Four 18,000µF caps, two enormous trafos, star-shaped heatsinks which many later siblings would inherit from - and unbelievable reliability.
The B-2 quickly became a big bestseller : the total production should be in excess of 10,000 units - quite impressive, for an amplifier priced at 200,000Y in 1976 !
No wonder, it IS one of the best amplifiers of all time : V-FET and Yamaha oblige.
Briefly available in silver in a few markets, late in the production run, circa 1978/1979, but not in Japan.
William, who owns several B-1s and B-2s, has sent this little comment :
"I just did a controlled A-B listening test between the Sony TA-4650, a Yamaha B-2 and a Yamaha B-1.
The B-1 came out on top (at $1600.00 new and being an ALL Fet design, it should have) and the Sony and B-2 were so close. Both use complementary V-fets, so that probably figures. Perhaps the Yamaha units can handle more.
In an Audio Magazine Report, Bascom H. King said that the onset of clipping occured at 220W @ 8 Ohms on the B-1. Thats 46% over spec !"
page online since : 2005
page updated : march 2010
page type : LGT / KNB
page weight : 152.05 Kb / 0 b
page updated : march 2010
page type : LGT / KNB
page weight : 152.05 Kb / 0 b
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