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Overview: The Pro-Ject Audio Systems Tube Box II for MM and MC is a very high-quality phono
cartridge preamplifier. This unit produces a lively and powerful performance
with convincing sound staging and emotional presentation.
Metal Case: The phone preamplifier features a metal case that shields
the electronics from vibration and electromagnetic interference.
Dual-Mono Circuitry: The Pro-Ject Tube Box II utilizes dual-mono
architecture with two double triode tubes (12AX7A -ECC83) for optimum channel separation.
MM/MC Compatible: The Pro-Ject Tube Box II phono preamplifier offers
amplifications and RIAA equalization for MM and MC cartridges.
MM/MC Switch: The Pro-Ject Tube Box II phono preamplifier is equipped
with a rear-panel MM/MC switch.
Subsonic Filter: There is a Subsonic filter selection switch located on the
rear of the unit. The Subsonic filter helps to reduce low-frequency rumble and
wasted amplifier power.
Gold-Plated RCA Connections: The Pro-Ject Box II is equipped with a
pair of gold-plated RCA connections for the output stage and input stage. The
gold-plate RCA connectors offer corrosion-free signal transfer.
Power Requirements: The Pro-Ject Tube Box II turntable preamplifier
operates off of standard household current using the included oversized outboard
power supply (Input: 120V AC~60Hz, 220mA /
Output: 16V AC, 100mA). The outboard power supply helps reduce noise and
Tubes: ECC83 x 2 (12AX 7A)
- MM: 47k ohms / 120pF
- MC: 100 ohms / 120pf
- MM: 300mV / 1kHz @ 3mV / 1kHz
- MC: 300mV / 1kHz @ 0.3mV / 1kHz
- MM: 84dbV (94dBV - 'A' weighted)
- MC: 67dBV (74dBV - 'A' weighted)
RIAA-Equalization Curve Accuracy: < 0.5dB / 20Hz-20kHz
Subsonic Filter: @ 18Hz with 18dB/oct.
Power Supply: 16V / 1A AC
Power Consumption: 16V / 410mA AC