This Conar 224 Tube Tester has been fully restored and calibrated for dependable, accurate tube evaluation. It’s ready for regular service on your bench or as a fine collectible display piece. It comes with a one-year warranty for your peace of mind. See warranty details here.
Restoration
- Calibrated and tested – verified across tube types for consistent accuracy
- Capacitors and resistors replaced – all components affecting performance and calibration replaced
- New polarized power cord – upgraded for modern safety standards
- Kit verification – every solder joint and wiring connection inspected and confirmed sound
- Case condition – original case in very good condition showing minimal wear
- Socket cleaning – all sockets cleaned and contacts conditioned for reliable testing
Key Features
- Testing Method: dynamic emission tester with shorts test
- Socket Support: 4-pin, 5-pin, 6-pin, 7-pin, Octal, Loctal, and miniature sockets
- Tube Range: covers most radio, television, and audio tubes from the 1940s through the 1960s
- Construction: originally sold as a Conar student kit by NRI, providing solid educational design and service-grade performance
Condition
I have fully restored and calibrated this Conar 224 to original operating specifications. Critical components were tested and replaced where necessary. Calibration was confirmed with reference tubes. The case presents well with minimal wear and retains its original appearance.
The Conar 224 was a reliable and affordable tube tester produced for NRI students and hobbyists. Although not a mutual conductance tester, it provides accurate test results suitable for servicing and evaluating vintage radio and audio tubes.
Included
- Two original sets of Assembly Manual, Tube Test Data, and Supplemental Tube Test Data
- New Polarized Power cord installed for safety
- One-year warranty coverage
This restored Conar 224 is both a functional instrument and a fine example of mid-century electronics craftsmanship.
This Precision 920 tube tester is $425 with free shipping to the lower 48 states.
Contact Me if you are interested in this tube tester.
