Review on 🎧 Sensational Sound: Explore the SMSL T2 Vacuum Tube Headphone Amplifier for Unmatched Audio Quality by April Lee

It looks like the tubes in this amp are working, they're on the audio channel and they're actually doing something. However, these are not 6J9 bulbs. I don't know what it actually is, but the 6J9 tube is a 10-pin triple triode, which cannot work in place of the E180F or other suggested replacements. These lamps are 9-pin pentodes. The lamp connector has 9 pins, so you can't even plug in a real 6J9. I have tube extensions and an oscilloscope so I could verify that there was sound at the cathode (pin 1/K) and grid (pin 2). /G1) with the pinout for E180F. There is no signal on the tablet, only 12VDC. Since there is no sound on the cymbal, the tube can only be configured as a cathode follower. I have verified that it operates at a little less than unity gain and this agrees with the cathode follower. With only 12 volts across the board, tubes can't provide much voltage gain anyway. They are rated for 190V for normal use. The final outputs appear to be op-amp chips, and while some will surely say that this defeats the whole purpose of a tube, it actually isn't. The problem with solid state amplifiers is that they are really too good, too precise and too fast for natural sounding sound. Any digital artifacts in the music are amplified and transmitted to the headphones. Just a lamp in the circuit, which acts as a converter, smoothes out the rough edges of digital music. Although the output stage is an op-amp, it amplifies cleaned music. Accuracy and speed do not harm anything if there is no longer any digital sharpness in the signal. So, yes, I was very pleasantly surprised to see that the lamps did more than just light up and make me feel better. My complaint with him is blinding blue LEDs under the tubes. I really could do without them. However, there's nothing that a little dab of black RTV can fix. <EDIT> I found that instead of developing their own pipe numbering system like the Russians or the Europeans, the Chinese decided to randomly reuse American pipe numbers for entirely different purposes. Tube. This is why the Chinese 6J9 tube is a pentode and the original American 6J9 tube is a triple triode. I see no way that Confucius could have called.