Manley MASTERINGROOM STANDARD REFERENCE PREAMPLIFIER - Manual (Page 9)

SPECIFICATIONS
Vacuum Tubes: 4 x 12AX7's, 2 x 12AU7's, 2 x 12AT7's
Gain (line stage) 20 dB switched to full
15 dB switched to reduced
(MM stage) 60 dB switched to full
40 dB at REC OUT
(MC stage) 70 dB switched to full
50 dB at REC OUT
RIAA (MC & MM phono stages) +19.27 dB @ 20Hz
-19.62 dB @ 20KHz
Input Inpedance 100 Kohm line stages
47K MM stage
38 ohm MC stage, transformer
Output Impedance 120 ohms
Power Consumption 33 Watts (275mA @ 120VAC)