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  • Yamamoto Sound Craft A-08S-205D power amplifier
  • Yamamoto Sound Craft A-08S-205D power amplifier
  • Yamamoto Sound Craft A-08S-205D power amplifier
  • Yamamoto Sound Craft A-08S-205D power amplifier
  • Yamamoto Sound Craft A-08S-205D power amplifier
  • Yamamoto Sound Craft A-08S-205D power amplifier

Yamamoto Sound Craft
A-08S-205D power amplifier

Product code: 205D
Regular price ¥770,000 円
Regular price ¥770,000 円 Sale price ¥770,000 円
Sale Sold out
Tax included. Shipping calculated at checkout.
Appendix output tube
Power-supply voltage

Western Electroic 205D exclusive amplifier

A-08S Western Electric 205D version

Description

WE205D is a very good amplifier, but its output is only about 1W stronger. Therefore, speakers to use are limited. High efficiency loudspeakers such as Altick, JBL, Rouser are suitable. These speakers have high conversion efficiency and good efficiency, so the output of the amplifier is small. On the other hand, however, the noise of the amplifier also increases accordingly. Generally speaking, WE205D can suppress the noise level considerably with AC ignition. For various reasons such as fluctuations in vacuum tubes and other reasons, the output noise tends to vary in AC ignition. For that reason, the ignition method of WE205D is converted to DC ignition method using Schottky diode by double-wave rectification. To simplify the circuit, a constant voltage circuit is not adopted, but adopted only diodes and condensers. As a result, the residual noise could be suppressed as low as 0.4 - 0.6 mV.
The voltage supplied to the WE205D was also raised slightly, and the maximum output was approximately 1.3 W. The rectifying tube has changed to 80 with a clear sound more than 5U4G.
DC ignition of the former stage circuit, Yamamoto Sound original capacitor sealed in ebony case, refinedoutput transformer andadopted the highest quality parts for each section.

An ammeter is placed on the chassis to constantly check the current in the output tube. The operation state of the precious WE205D vacuum tube can be confirmed, approximate lifetime of the vacuum tube can be judged with this ammeter.
Thanks to these improvements, the sound has become more vibrant and powerful. Tested WE-205D with a large 3 way speaker system or ALTEC 605 A, it was far stronger than 300B, and clear sound.

Operating condition of WE-205D



  • Plate Voltage: 380V

  • Plate Current: 25mA

  • Plate loss: Approximately9.5W

  • Rp: 5k ohms

  • Rk: 1.25k ohms


  • Drive system: CR Coupled Self Biasing Method


Spec
Vacuum tube WE-205D(Option),WE-717A, 80
Maximum output 1.3W/8ohms
Frequency response 22Hz-30kHz(-3dB)
Input sensitivity 0.4V/input,4W/output
Residual noise 0.4-0.6mV
Gain 16dB
Dimensions 400(W)294(D)204(H)mm
Weight 14.3�s

Yamamoto Sound Craft A-08S-205D power amplifier

Regular price ¥770,000 円
Regular price ¥770,000 円 Sale price ¥770,000 円
Sale Sold out
Tax included.