Douk Audio P5 HiFi Vacuum Tube Headphone Amplifier and Stereo Preamp Review

The Douk Audio P5 is a vacuum tube headphone amplifier that doubles as a stereo preamp, priced at $89.99. It targets desktop listeners who want analog warmth with modern convenience, and it comes in either a machined full-aluminum chassis or a retro solid walnut version.

Inside, each channel gets its own dedicated amplifier circuit - a dual-mono layout that the maker says improves stereo separation and reduces crosstalk compared with shared-path designs. The tube stage runs at 200V for rich, clean and warm analog sound. Headphones connect through either a 4.4mm balanced jack or a 6.35mm single-ended jack, and an impedance switch flips gain between 5dB and 15dB to suit headphones from 16 to 600 ohms. Note that the outputs follow a priority order - 4.4mm first, then 6.35mm, then RCA - so unused ports should be unplugged if you hear nothing.

Beyond headphones, the P5 routes its tube-processed signal through the RCA output to a desktop power amplifier or active speakers. The two NE5532 op-amps and two 6A2 vacuum tubes sit in pluggable sockets: the tubes can be replaced with 5654, 6*7N, 6AK5, EF95 or 403B types and the op-amps with common dual chips. A six-mode ambient LED system glows along with the music, and the warm-up window is adjustable from 10 to 30 seconds to extend tube life. Always power down and disconnect before swapping the op-amps or tubes, because high voltage is present inside.

Douk Audio ships worldwide with free and expedited shipping options at varying cost by country. Packages under 2kg travel by airmail in roughly 10-25 days, while orders over 2kg ship via DHL/UPS/FedEx in about 5-8 days, and any import duties or customs charges are the customer's responsibility. Returns are free within 30 days for a full refund, and every item carries a 1-year warranty. Exclusions cover orders placed by mistake, man-made damage or misuse, a change of mind, and anything outside the warranty terms.