Yamamoto Amps



"45" Single stereo amplifier A-08S

  • Form: 45 single stereo power amplifiers
  • Use vacuum tube: "45" (the vintage articles made in U.S.) 2 pcs, 717A 2 pcs, "80" 1 pc all standard belonging
  • Biggest output: 2W+2W
  • Frequency characteristic: 18-30kHz (1W output at the time of)
  • Input impedance: 200k ohms
  • External form measure: 400 (W) 294 (D) 204 (H)


















300B single stereo amplifier A-09S

  • Form: 300B single stereo power amplifier
  • Use vacuum tube: 300B 2pcs. C3m 2pcs. 5U4G 1pc. (a standard is without Output tubes)
  • Maximum output: 8W+8W,
  • Frequency characteristic: 15 to 22 kHz (-3dB)
  • Residual noise: 0.6mV
  • Input impedance: 200kohm
  • Weight: -- 18.8kg
  • Outside dimension: -- 500 (W) -- 294 (D) -- 208 (H)




















AD1 Single Stereo Power Amplifier A06-3














"2A3" Single stereo amplifier A-011 with input volume

  • Form : 2A3 single stereo power amplifier
  • Use vacuum tube : Two 2A3s (it not being attached and there being also - or an RCA 2A3 attached type), 717A 2pcs, 80 1pc
  • Maximum output : 4W+4W / Frequency characteristic : 20-30kHz(at time of 1W output
  • Input sensitivity : It is 4W output at the time of 0.4V input
  • Gain : 24.5dB / Residual noise : about 1mV
  • Input volume : 100k ohms dual A type volume / Input impedance : 100k ohms
  • Outside dimension : 400 (W) -- 294 (D) -- 204 (H)















WE205D Single Stereo Power Amplifier A-08S-WE205D Version

  • Output tube: WE-205D (Tennis ball shape, selling each)
  • Driver tube: WE-717A
  • Rectifier tube: 80
  • Biggest output: 1.3W/8Ω
  • Frequency characteristic: 22 Hz-30kHz (-3dB)
  • Remaining noise: 0.4-0.6mV
  • Action condition of WE-205D
  • Plate Voltage: 380V
  • Plate Current: 25mA
  • Plate dissipation: about 9.5W
  • Rp: 5k ohms
  • Rk: 1.25k ohms
  • Drive method: the CR connection self bias method













WE101D,104D Single Stereo Power Amplifier A-08S-WE101D,104D Version

  • output tube: -- WE-101D or WE104D
  • driver tube: -- C3m (a shielding case is removed and used)
  • Rectifier tube: 80
  • maximum output: -- WE101D: -- about 0.6W/8ohm WE104D: -- about -- 0.8W/8ohm
  • frequency characteristic: -- 22Hz-28kHz (-3dB)
  • remains noise: -- 0.4 to 0.8 mV
  • Impedance of an output transformer: Primary side 5komega, secondary side:8-ohm
  • drive system:CR combination, an auto-bias system
  • Price: 320,000 yen (the price according to - output tube classified by tax, and build to order)






















Vacuum Tube Pre amplifier CA-03
Vacuum Tube Pre amplifier CA-03L
Vacuum Tube Phono Equalizer Amplifier EQB-01























Line level Preamplifier CA-04

  • Form: Vacuum tube line level exclusive use pre amplifier
  • Use vacuum tube: 6AK5W made of Telefunken 2 pcs
  • Biggest output: 8V
  • Frequency characteristic: 10-150kHz (-0.5db)
  • Remaining noise: 0.07mV
  • Line amplifier department gain: 16dB (about 6 times)
  • Input impedance: 50k ohms
  • Output impedance: 1.6k ohms
  • External form measure: 420 (W) 290 (D) 94 (H)
  • Weight: 6.3 kg