🔍 Nobsound Vacuum Amplifier Current Tester: Accurate Measurement for Audio Devices Review

$16.00+ for outlet and two wires with banana plugs; easy enough, right? And yet they couldn't even get it right; GARBAGE! Don't waste your money, spend a little more and buy quality. I got this as a Christmas present and tried it for the first time today (May 1st, 2020) so I'm pretty sure the return/refund option is long gone. BUYER BEWARE!

Probe test leads are too short to extend. Banana plugs have a lip that prevents them from being fully inserted into a few feet. This sensor measures the plate current of the vacuum tube (high side) which can be quite high in the 400-600V range. At this dangerous voltage, they must fully penetrate the meter and be long enough to reach the meter while standing next to it. I assume I'll have to modify the test leads myself, but that should actually work right away.

I followed the directions to the letter "T" and ended up with two dead tubes! This means that once the Nobsound was in place I plugged in the original tube, turned on the amp and read '1', dialed a few different values on my multimeter and nothing. After turning off the amp and removing the tube and no sound, I replaced the tube in the slot and nothing. there isn't even a dim light while everyone else is burning. I thought I just had one bad whistle, repeated the sequence with another whistle…

Keyhole extended on one side to allow current tube to be inserted into probe per contact. It looks like it's about to hit! This damaged my amplifier. Fortunately, this only resulted in a burnt screen resistor and damage to the tube. I'm good with a soldering iron and replaced the resistor and now the amp works fine but the board is charred and my 6550 pair is just a tube now. You can rate this to see how much they cost. Madness to say the least. Don't skimp on test equipment, even something as…

I got this device and it died. I couldn't figure out what was going on after some thought and a little research, that's all. The red probe connects to pin 3 of the female (white) jack and the black wire connects to pin 3 of the male (black/main) jack. My red wire was not connected. I took a small screwdriver, broke off the plastic and soldered the wire. Then wrapped with tape. With my 50 Watt Jcm800 I could not measure the rightmost tube (V5). I moved it to the left (V4) and it worked. Now set…