Yamaha B-1

1 9 7 4 1974
1 9 8 0 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.

Yamaha B-1, image 1 Yamaha B-1, image 2 Yamaha B-1, image 3
Yamaha B-1 specifications
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 : 0 topic
(last updated topic shows up first)
page online since : 2005
page updated : not yet
page type : LGT / KNB
page weight : 116.2 Kb / 0 b

You must login to access your account.


I forgot my password

Log me automatically on each visit
Hide my online status for this session
> Create an account

Close
  • TVK Talk Forum
  • TVK Museum
  • Specials
  • Timelines
  • Utilities
  • Games