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A bare DIY preamp board built around two 6J1 pentode tubes, laid out as a copy of the Musical Fidelity X-10D buffer circuit with some tweaks. It runs from a single 12V AC input and generates its own plate and heater voltages on board, with a bank of eight 470uF capacitors filtering the supply and the two heaters wired in series on DC to keep noise down. It is a board and a clear shell, not a finished amp: you supply the 12V AC source, the tubes and the wiring, and you assemble it yourself. That makes it a project for hobbyists who want to experiment with tube sound on a small budget rather than a plug-and-play headphone amp.
In stockSold by Mrain SkyReturns: Sold by a Walmart Marketplace seller; returns go to the seller under the seller's returns policy.
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Lowest price we've seen: $12.39 on Nov 13 at Amazon. Tracked across 1 store since Nov 13.
The FE-6J1-2 is a DIY tube preamp board. Its circuit is based on the Music Fax X-10D schematic, with optimizations for more stable performance than the original unit. The tube stage is described as giving a 10% increase in tube play.
The board runs on a single 12V AC input. Its circuit supplies the positive and negative voltages and the filament voltage that the 6J1 tubes need. The power supply starts the boost from zero voltage, so the filament heats gradually. Eight 470uF capacitors filter the supply.
The filament runs on 12V DC. Two tubes are connected in series on one DC filament supply, which also helps reduce noise. The kit needs to be assembled.
