Gear News

Orange Valve Tester MKII: A New Standard in Precision Hi-Fi Tube Testing for Guitarists and Technicians

Orange is proud to launch the Valve Tester MKII; the quick, simple and accurate way to test and match valves for guitarists, guitar techs and amp repair shops

The Orange Valve Tester MKII is made and designed in the UK and supersedes the Orange VT1000, the world’s first automatic digital valve tester pioneered, developed and patented by Orange. It effortlessly performs a wide range of tests with speed, simplicity and accuracy, setting a new world standard in valve-testing technology for guitar enthusiasts and service professionals alike.

The simplicity of operation belies the complexity of what happens inside the unit during each test. Inside is a sophisticated microprocessor controlled testing system carrying out a series of complex inter-electrode switching and measurement exercises. Requiring no knowledge of valve theory a user simply inserts a valve into the correct socket, selects the valve type from the list and presses the ‘OK’ button. The status of the valve under test is quickly revealed.

ValveTester_MKII, photo credit Orange Amps
ValveTester_MKII, photo credit Orange Amps

The latest model of the Orange Valve Tester features greatly improved algorithms with an updated database containing the test results of literally hundreds of new, used and faulty valves giving the MKII a much greater intelligence compared to the original Orange VT1000. All the voltages required by the tester are internally derived, stabilised and controlled allowing a rapid static and transient testing without unnecessary heat generation.

In addition, the new unit features higher current capacity with enhanced ‘grid leakage detection testing’, a new ‘thermal runaway’ test and a new ‘digital microphony function’ to test pre-amp valves. Its new rugged mechanical design and form also has improved valve sockets.

The Orange Valve Tester MKII’s new optional expansion modules will be particularly appealing to guitar enthusiasts. It allows the testing other valve types including EF86 and rectifier valve GZ34.

The Orange Valve Tester MKII is a sophisticated, simple to use, stylish and portable unit. It offers guitarists, guitar techs and amp repair shops the perfect blend of simplicity and precision in amp maintenance. The device’s fully automatic testing and matching capabilities ensure optimal valve performance across a wide range of audio valve equipment allowing users to effortlessly maintain quality, maximum performance and limit possible distortion of their guitar amplifiers caused by substandard, worn or faulty valves.


Published since 2005 as a printed magazine, TopGuitar is a magazine of opinion for professional and amateur musicians. Since 2020 on a digital platform. Contain reviews of various guitar-related musical gear, interviews and original articles on world’s most popular artists, music reviews, event reports, guitar workshops and tips, the latest products and artist news. The Editor-in-Chief is Dr. Dariusz Domanski, a guitarist and academic teacher, doctor of musical arts.