Abacus Aikido Tube Buffer Preamplifier with Remote

Abacus Aikido tube buffer preamplifier based on John Broskie’s ACF-2 Aikido Cathode Follower schematic as described on TubeCAD website
ACF-2 is unique in terms of its architecture featuring extremely low distortion together with very low output impedance and high input impedance.

Preamplifier has zero gain which is perfect for use with modern sources and amplifiers.

Features:

3 inputs and 1 pair of outputs.
Remote controls all functions of the preamp - on/off, volume, and input selection.
Front panel LED’s display the input selection.
30 sec. start-up output mute to prevent pops and noise on the output during warm-up. There are no pops or noise when turning the preamp on or off with power amps on.
Front panel LED indicates "ready" state.
12V remote trigger output.
Volume is controlled by 128-step relay attenuator to achieve perfect balance and low noise.

Preamp is constructed with highest quality parts - Holco, Allen-Bradley, and precision Dale resistors, PIO coupling caps, Teflon silver signal wire.

Tubes used are Russian 6N1P which sound great, are inexpensive and plentiful. They could be substituted with 6dj8 or similar types.

I tried this preamp in front of my Hypex NCore 400 amplifiers and it performed great. I also tested it in front of TPA3116 and 300b amplifiers and its performance was excellent - no turn on / turn off noise, no hum or hiss, completely transparent musically.

Here's the feedback from the customer who purchased one of my ACF-2 preamps:
"The ACF-2 works very well with my 300B SET amps. For the money I cannot believe there is anything better. The performance is excellent in absolute terms, meeting or exceeding the performance of my active preamps costing five times more. Well done. Installed some Cryoset Super Cyro 6N1P tubes and SandyPhoto (ebay) duoDampers.
Sanford Schoolfield"

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