I restored this Precision 10-12 Tube Tester and it is fully functional. It is ready for reliable use in a workshop or as a collectible display piece. It also comes with a one-year warranty for your peace of mind. See warranty details here.
Restoration:
- New analog meter – replaced the failed original unit
- Capacitors replaced – capacitors prone to failure replaced
- Resistors Replaced – resistors affecting calibration and accuracy replaced
- New power cord – modern safety upgrade
- Calibrated and tested – calibrated to factory specifications and checked for accuracy across tube types
- Refinished wood case – clean, smooth finish with preserved original character
Key Features:
- Testing Method: emission tester with dynamic grid leakage testing
- Socket Support: 4-pin, 5-pin, 6-pin, 7-pin, Octal, Loctal, 7- and 9-pin miniatures
- Tests a wide range of tubes – including older and newer types
- Built-in tube chart roll – fully functional and readable
Condition:
I have fully restored and calibrated this tube tester. All capacitors replaced, contacts cleaned, and unit verified with known-good reference tubes. Includes updated power cord.
The Precision 10-12 was a popular choice for radio and TV repair technicians, especially during the 1950s and 60s. Its wide tube compatibility and rugged design made it a mainstay on the benches of independent repair shops and service departments. It combined solid emission testing with grid leakage detection, it provides reliable go/no-go results without the complexity of mutual conductance testers.
It was also commonly used by hobbyists, ham radio operators, and electronics experimenters, who appreciated its versatility and ease of use. Today, it remains a solid choice for tube audio enthusiasts and vintage equipment restorers who want a dependable, straightforward tester for evaluating a wide range of tubes.
I refinished this case and it is in great condition. The Precision tube tester wood cases look really nice when given a restoration.
The manual is available to download here
This Precision 10-12 tube tester is $325 with free shipping to the lower 48 states.
Contact Me if you are interested in this tube tester.
