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compu-bias.com
Compu-Bias™ Computerized Tube / Valve Bias Meter
Compu-Bias Automated Tube Amp Bias Meter For Vintage Stereo HiFi Guitar and JukeBox. Octal or Noval (9 pin) Probe. Properly setting the bias of your tube amplifier will extend tube life. DIY guitar stereo and hifi amp and amp kit builders