Nobsound CT1-BOX - 100 mA 5.5/2.2 mm

Features: Brand: Douk Audio Model: CT1-BOX DC Plug: 5.5/2.2 mm Length of tube socket cable: 23 cm Tube socket material: ceramic. Range of current meter: 100 mA Dimensions of box (W x D x H): 150 x 106 x 70 mm / 5.90 x 4.17 x 2.75 inches Net weight: 500 g / 1.10 lb Package weight: 1000 g / 2.20 lb How to use it? 1. Turn off your amplifier, and connect two probe testers separately to the A and B interface of CT1-BOX. 2. Remove the power tubes, insert them into the bias probe sockets. 3. Insert bias meter probes into the tube sockets of the amplifier. 4. Turn on your power amp, let the tubes get warm about 5 minutes, then read the bias measurement. 5. The left current meter is reading "A" input, and the right current meter is reading for "B" input. If the reading value of both are the same, that's perfect. If not, the difference should be no more than 2mA or 3mA for a good balance between the tubes. Package contents: 1 pair x sample tester. 1 x current meter box.