This is one of the most valuable tools anyone who owns tubes amps could own! It is the most accurate, easy-to-use tube tester in the world. We have been in production since 2002 and have made numerous improvements to make this instrument invaluable to tube users, sellers, OEMS and more. The Dual Preamp Triode Characterizer performs the following valuable tests: 1. Tube Microphonics and Noise tests for Both Triodes - Uses either internal 4 inch dynamic speaker, headphone jack or BNC oscilloscope out to actually see the tube noise. With this feature, you can carefully evaluate your tubes to cull the noisy and microphonic ones and keep the quiet ones. This is extremely important for guitar amps and sensitive phono stages. This instrument tests for microphonics using the tap test. You can actually hear tube microphonics and noise for each triode section. 2. Gain Test for Both Triodes -This is extremely valuable in matching tubes for sensitive phono and gain stages. Quickly compares tube output on both sections for perfect matched tubes. Determines sensitivity of tubes and projected useful life. The highly sensitive analog meter is calibrated specifically for medium and high gain types. 3. Balanced Section Test -This is important for absolutely the closest cathode current match. This is essential for sensitive phono and preamp stages to get the maximum performance out of your tube equipment. Octal socket adapters available for 5691/5692/6SL7/6SN7/12SL7/12SN7 tubes. Note. This adapter also includes a high-quality 9 pin socket saver and the ability to rewire the adapter to test the following tubes: EF86, 7199, 6GH8, 6BL8, etc. $70 each. Also available with optional International Regulated DC power supply for use in all voltages from 90 to 250VAC and 50-60 cycles. Also includes correct wall socket plugs for Europe, Asia, Australia, Africa, China, etc. This regulated power supply is an additional $70 option.

The only portable, fully-regulated tube tester in the world. Easy to use and very accurate

Tests all types of preamp tubes like the 12AX7, 6CG7, 12BH7, 5751, 6SN7, 6SL7, 12AT7, 6922, 6DJ8, 7308, EF86, 6GH8, 7199, and dozens more

Four fully regulated power supplies for the ultimate in accuracy and stability

Dual meters to measure gain and cathode current balance

Built-in four inch speaker to listen to tube for noise, microphonics and sound quality