The Aikido PH-2 phono stage is based on the Aikido topology, which makes perfect sense, as the Aikido’s low distortion, noise, and output impedance, without the use of negative feedback—all are highly desirable attributes in a phono preamp. Our goals always remain constant: high-gain, low-noise, and low output impedance.
The new Attn-2 stepped attenuator uses both series and ladder attenuators, with three rotary switches to yield a total of 99 possible decrements of attenuation in 0.6dB steps, which means we can step down to -59.4dB in -0.6dB decrements. The leftmost and rightmost switches hold eleven positions and are mono ladder attenuators for the left and right channels, with only two resistors switched in at a time, attenuating up to -5.4dB per channel, with a mute in the final position. The center switch cascades from the two flanking switches and it defines a stereo series attenuator with 11 resistors in series per channel, with -6dB decrements, establishing a maximum of -54dB of attenuation, with a hard mute in the final position.