DIY Tube Audio Kits

All boards are audio-grade PCBs: Double-sided, plated through holes, extra-thick board, 2oz-copper traces, clean solder mask and part location silk screening.

All printed circuit boards are expensively and lovingly made in USA

Tube-Based Buffers
Tube-based buffers provide no gain, but do offer a low output impedance and can deliver the current needed to drive capacitance-laden cables.
Voltage Regulators & Power Supplies
New New LV-Regulator: an audio-grade low-voltage regulator that uses a simple RC filter (1 ohm & 10kµF) as a pre-filter before the LDO regulator and holds bypass capacitors for all the electrolytic capacitors and a 4.7µF/400V polypropylene shunting capacitor at the output. Perfect replacing the cheap switcher wallwart that came with your external DAC or Squeezebox Duet or Touch.
Line Stage Amplifiers
Aikido LV, ACF, CCDA, BCF, Unbalancer, and SRPP+ PCBs and kits. Buy just the PCB or add the items that you need to finish your project.
Headphone Amplifiers
Ah, headphones: either you love them or you hate them. I love them. I like not hearing noise from refrigerators, air conditioners, barking dogs, the subwoofers of rude neighbors, cars, trucks, and especially loud minibikes and motorcycles. Moreover, I like hearing normally unfamiliar and uncharted musical events: the floorboards creaking beneath the 300-pound jazz bass player, the hall’s reverberation, the guitarist’s fingerprints across the strings, the vocalist’s gasps for air, the recording engineer’s clumsy edits, the sheet music’s repeated turnings during every classical performance, George Harrison’s thick-fingered flubs, the mechanical articulation on a saxophone, the pianist’s humming—well, strike that last one item—in other words, the hundred diminutive sonic artifacts harbored by recordings but seldom heard. Some are annoying, others are embarrassing, others still are transporting, but all reveal a hidden world unmapped by even the finest loudspeakers.

Tubes are famous for their musical sound, which soothes the soul. Bringing the tube's magic to headphone listening is the goal.
Phono Preamps
Aikido & Tetra Phono Stages are stereo tube phono preamps that uses two gain stages per channel and passive equalization in between.
Attenuators and Signal Selecters
Stepped attenuator kits and audio signal switches. Staggered AC power switch.
Capacitors and Sockets
Coupling capacitors and tube sockets for your tube audio projects.
Tone Controls
Tone Controls