New! 24V Stereo Aikido line-stage/headphone amplifier kit and new custom Aikido line stage kits. Printed Circuit Boards and kits to match Tube CAD Journal circuit designs. Aikido and stepped attenuator kits.

Only six kits are available. That is all the 6GM8/6N27P/ECC86 tubes I could gather. As I collect more of these amazing little tubes, I will offer more kits.

New Low-Voltage and High-Voltage Regulator Kits

Aikido Phono-Stage is a stereo phono preamp that uses two Aikido gain stages per channel and passive equalization in between.

New and Improved TCJ Stepped Attenuator Kit

New circuit board! 24V Aikido Tube Line Stage and Headphone Amplifier

9-Pin stereo Aikido PCB boards are four inches by ten inches, with eight mounting holes. Boards are made in the USA and come with schematic and recommended part values and design examples.

This is a stereo Aikido PCB that accepts 5687s in the output tube position. These wonderful and relatively cheap tubes are a natural for driving high-impedance headphones and high-capacitance interconnects.

Octal stereo Aikido PCB boards are four inches by ten inches, with eight mounting holes. Perfect for use with 6SN7 and 12SN7 tubes. Boards are made in the USA and come with schematic and recommended part values and design examples.

Single channel Aikido printed circuit boards for 9-pin tubes. Perfect for stereo and 5-channel systems and for use in monoblock power amplifiers.

A single channel Aikido line-stage amplifier printed circuit board for octal dual triodes, such as the 6AS7, 6BL7, 6BX7, 6SL7, 6SN7, 12SL7, 12SN7, 12SX7, 5691, 5692, 6080, B65, ECC32, ECC33…

Aikido Line Stage Amplifier Kit (octal-based & stereo). Includes tubes, resistors, PS and heater bypass capacitors, two sets of coupling capacitors (PIO and film), printed circuit board, ceramic tube sockets, and board stand offs.

Aikido Line Stage Amplifier Kit. Includes tubes, resistors, PS and heater bypass capacitors, two sets of coupling capacitors (PIO and film), two printed circuit boards, ceramic tube sockets, and board stand offs.

Custom Aikido Line Stage Amplifier Kit (Octal & dual-mono). Select only what you need: tubes, resistors, PS and heater bypass capacitors, two types of coupling capacitors (PIO and film), printed circuit boards, ceramic tube sockets, and board stand offs.

Aikido Line Stage Amplifier Kit (9-Pin & dual-mono). Includes tubes, resistors, PS and heater bypass capacitors, two sets of coupling capacitors (PIO and film), two printed circuit boards, ceramic tube sockets, and board stand offs.

5687-based Aikido line stage amplifier kit. Includes tubes (EH 6CG& & NOS JAN 5687), resistors, power-supply and heater bypass capacitors, two sets of coupling capacitors (PIO and film), printed circuit board, ceramic tube sockets, and board stand offs.