47Lab Phonocube w/1 Humpty

About the 47Lab Phonocube w/1 Humpty

The 47 Laboratory Phonocube (Model 4712) is a dual-mono, op-amp-based phono preamplifier designed specifically for low-output, low-impedance moving coil cartridges. It is notable for its current amplification topology, which results in a 0 ohm input impedance—unlike traditional voltage amplification phono stages. This design means the output level is determined by the cartridge's output current (voltage divided by internal impedance), making it especially suitable for cartridges with extremely low output and/or high internal impedance. The Phonocube is available in two gain versions: standard (75 dB) for most MC cartridges, and high gain (90 dB) for cartridges with very low output or high impedance. The unit is housed in a compact, non-conductive Shigaraki ceramic casing and is typically sold with the Power Humpty (Model 4700) external power supply, which can be configured for dual-mono operation with two supplies. The Phonocube is not compatible with moving magnet (MM) cartridges. Its sound is characterized by clarity, low noise, and a dynamic, well-defined soundstage, reflecting 47 Laboratory's philosophy of simplicity and minimalism in circuit design.