The schematic shows one channel of a stereo amplifier, and the power supply is sufficient for both channels. Transformer T2 supplies the voltages required for the vacuum tube plates. Selection of the ...

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).

[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 ...