Heathkit-IT-21-tube data.pdfTube setting chartsAdobe Portable Document Format - 2.08 MB - 06/17/2022 at 18:47 |
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Heathkit it-17 tube tester.pdfIT-17 manual and schematics. Single page schematics.Adobe Portable Document Format - 836.13 kB - 06/17/2022 at 18:46 |
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Heathkit IT-21 tube tester.pdfIT-21 assembly, manual, schematics. Better build instructions, but schematics are split between pages.Adobe Portable Document Format - 1.67 MB - 06/17/2022 at 18:45 |
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