The search returned 2 articles:

  1. March 2022: Project: Amplifier Clipping Indicator by John Clarke, kits: Amplifier Clipping Indicator, PCBs: SC 01112211 [print issue] [online issue]
  2. March 2022: Project: Amplifier Clipping Indicator by John Clarke, kits: Amplifier Clipping Indicator, PCBs: SC 01112211, 6 shop items [print issue] [online issue]