bossarea-boss-tw-1-t-wahBoss TW-1 T Wah

The T stands for “Touch” and the early TW-1’s actually had the text Touch Wah written on them instead of T Wah. The TW-1 was replaced by the AW-2 in 1991. Together with the CS-1, the TW-1 is the only pedal to have a toggle switch. With only 2 controls, the TW-1 is very easy to control. The later autowah pedals have the added versatility of modulation but for the basic wah sound the TW-1 does the job without forcing the user to read the manual.

Version Differences

  • The earliest TW-1s was labelled Touch Wah instead of T Wah
  • There were both silver screw and black screw versions made
  • The T in TW-1 was first placed under the W in T Wah but later moved under the a
      Serial: 7300 – 9000
      Marking of PCB: 052-287A
      Switch: Up to 8500 transparency, from 8600 black
      Silver screw
      OP-AMP: RC3403A
      Momentary LED
      Serial 9100-0300
      Marking of PCB: 052-287B
      Switch: Black
      Silver screw
      OP-AMP: RC3403A
      Permanent LED
      Serial 0400-
      Marking of PCB: ET5206-510B
      Switch: Black
      Black screw
      OP-AMP: 2x uPC4558C or JRC4558D
      Permanent LED


  • Controls: Sens, Peak, 2-way Drive switch
  • Connectors: Input, Output, AC Adaptor
  • Current Draw: 6 mA (DC 9V)
  • Recommended AC Adaptor: ACA Series


  • Black – Made In Japan

The TW-1 was sold from July 1978 to May 1987.

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