Octal ACF-2 on Sale

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.

ACF 9-pin PCB & User Guide
The Aikido cathode follower PCB/kit is a modest affair, consisting of one tube per channel (two triodes per tube envelope) and a handful of capacitors and resistors. This unity-gain buffer, using a modified cathode follower, offers a high input impedance, a low output impedance, low distortion, and a great PSRR figure. In addition, the ACF does not invert the phase. The ACF use is not limited to line-stages, as the ACF can be used in creating an active crossover or even a headphone driver, if the headphone's impedance is high enough and the tube robust enough.
$24.00
ACF-2 PCB and User Guide
The ACF-2 is an All-in-One design that holds both the B+ and heater power supplies and two Aikido-ized cathode followers. In other words, the ACF-2 is a unity-gain buffer for those who do not need any extra voltage gain, but do need more current delivery than a passive line stage would allow.
$36.00
ACF-2 PCB Octal and User Guide
The ACF-2 octal is an All-in-One design that holds both the B+ and heater power supplies and two Aikidoized cathode followers. In other words, the ACF-2 octal is a unity-gain buffer for those who do not need any extra voltage gain, but do need more current delivery than a passive line stage would allow.
$36.00
BCF 9-Pin PCB & User Guide
The BCF receives a balanced input signal and converts it to an unbalanced output. It is a unity-gain buffer that offers a high input impedance, a low output impedance, low distortion, and great CMRR. In addition, because the BCF uses a push-pull topology, its use is not limited to line-stages, as the BCF can be used as a headphone buffer-amplifier if the headphone's impedance is high enough (say, 300-ohms).
$24.00
Octal Aikido Cathode Follower
The Aikido cathode follower PCB/kit is a modest affair, consisting of one tube per channel (two triodes per tube envelope) and a handful of capacitors and resistors. This unity-gain buffer, using a modified cathode follower, offers a high input impedance, a low output impedance, low distortion, and a great PSRR figure. In addition, the ACF does not invert the phase. The ACF use is not limited to line-stages, as the ACF can be used in creating an active crossover or even a headphone driver, if the headphone's impedance is high enough and the tube robust enough.
$24.00