价格才2k多，有意。
Pro-Ject Tube Box II
Pro-Ject Tube Box II Features:
# Phono MM/MC selection switch located at the rear of the unit
# Selectable Subsonic filter
# Metal case shields the electronics from vibrational and
electromagnetic interference
# Optimal channel separation through dual-mono circuitry
# Gold plated RCA connection sockets
# Outboard power supply included
Pro-Ject Tube Box II Specifications:
# Tubes 2 x ECC83 (12AX 7A)
# Input impedance, MM 47kohms/120pF
# Input impedances, MC 100ohms/120pF
# Gain, MM 40dB
# Output voltage typically 300mV/1kHz 3mV/1kHz (MM input)
# Gain, MC 60dB
# Output voltage typically 300mV/1kHz 0,3mV/1kHz (MC input)
# Noise floor, MM 84dB (94dB -A weighted)
# Noise floor, MC 67dB (75dB - A weighted)
# THD, MM 0,05%
# THD, MC 0,08%
# RIAA-equalisation curve accuracy 20Hz - 20kHz / max. 0,5dB
# Subsonic filter at 18Hz with 18dB/octave
# Power supply type Mains-fed outboard power supply
# Output voltage 16V/1.000mA AC
# Power consumption 16V/410mA AC
# Dimension W x H x D 103 x 76 x 141mm
# Weight 810g without power supply
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