Heathkit MI-31A Service Manual & Documentation

This page records the Heathkit MI-31A documentation available in the complete digital manual bundle. The exact manuals, schematics and related source material are listed below.

Manual availableDigital delivery by email
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Available documentation

  • MI-31A Electronic Tachometer schematics
  • MI-31A Electronic Tachometer schematics MJE340-SGS MJE340[NPN Hi-Volt_BJT]

Operating information can support setup and controls. Service instructions and schematics may assist qualified troubleshooting and repair where those document types are explicitly listed; no unverified specifications are added.

Bundle and delivery information

The MI-31A documents are not sold separately. Only the complete Heathkit manual bundle can be purchased. After purchase, the download link is sent by email. Nothing physical is shipped.

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