The Drop + xDuoo TA-84 OTL Tube Amp/DAC is not just about performance; it also boasts a sleek design. With dimensions of 10.6 x 6.4 x 4.6 in and a weight of 6.6 lbs, it is compact and portable.

Products like the Drop+Xduoo TA-84 OTL Headphone Amplifier have headphone enthusiasts such as myself extremely excited in 2023; and not just because of the affordable price tag. $349 USD for this ...

One of the best aspects of the Head-Fi revolution has been the growth of high-end Chinese brands in the market; Topping, Questyle, and Xduoo have all successfully carved out niches for themselves in ...

Figure 1 Hybrid tube/FET audio amp with active feedback. Since the op-amp output is at or near common potential, the vacuum tube pentode input stage is cathode-biased via R5 in the normal fashion. The ...

Schiit Audio’s Valhalla 3 is a high-end tube headphone amplifier primed for the desktop. It borrows a lot of tech from the company’s larger Folkvangr ($1,799), including its OTL/OCL design, which has ...

[Michael] found a nice reference design of an OTL amplifier for a 620 ohm single speaker. He decided to use the same design but because these speakers were about 300 ohm each, he would have to ...

The Drop + Xduoo TA-84 OTL Tube Amp/DAC is a bit of a mouthful, so let's break down what this $349 device actually does. First off, it's a digital to analogue converter (DAC).