There are a small handful of old tubes that need an impressively low voltage to work, though, and [J.G.] has put a few of them to work in this battery-powered audio tube amplifier. The key to the ...
Amazon has knocked a big 50% off this NEXPOW car battery jump starter in a major deal that also includes an extra discount on ...
FiiO has announced the BTR17, a new portable headphone amplifier built ... the device to drive power-hungry headphones without draining the connected phone’s battery. The small FiiO BTR17 ...
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