Can’t abide recorded sound that doesn’t involve analogue tubes, but dig the convenience of Bluetooth? No problem—have both. That’s the idea—well, one of the ideas—behind the DUO home audio system ($480+). Vacuum tubes, on board computers, power amp—you can swap everything out, because it’s all modular. If you’re a real audiophile, you’ll be pleased to hear that it comes standard with an Electro-Harmonix ECC82/12AU7, but they have three other options for you there, plus a few options for your computer, plus a couple dozen grill cover colour options.