Audio Database
Model877
Commentary

A preamplifier with dual monaural design.

The internal circuit is a dual-mono design, and both the amplifier and power supply have completely separate and independent LRs, thereby eliminating crosstalk between the two channels.

Equipped with 5 types of phono input sensitivity adjustment mechanism, the optimum sensitivity for the cartridge can be selected.

The volume uses a 23-step attenuator type.
In addition, a discrete low-capacity register with self-cleaning contact function is adopted.

It is compatible with MM/MC cartridge by adopting plug-in type module substrate.

It is possible to easily dub by using 2 tape recorders.

There was an optional remote control function.
The volume control and input signal can be switched by a circuit composed of a relay and a resistor. Although 40 dB is the standard setting for volume adjustment, it is also possible to select this in advance using the volume control on the main unit.

Model Rating
Type Control amplifier
Input Sensitivity / Impedance
(1 v output)
Phono MC (balanced) : 0.05 mV ~ 5 mV (46 dB ~ 86 dB) / 10 ~ 1k Ω
Phono MC (unbalanced) : 0.05 mV ~ 5 mV (46 dB ~ 86 dB) / 10 ~ 1k Ω
Phono MM (unbalanced) : 0.5 mV ~ 10 mV (40 dB ~ 66 dB) / 47k Ω (56 pF ~ 390 pF)
Tuner, CD, DAT, Tape1/2, Aux : 290 mv (10.75 db) / 12.5k Ω
Signal-to-noise ratio Input DIN-A (Load) 20 Hz to 20 kHz Gain Load input
Tuner/CD imbalance
Phono MC balance
Phono MC imbalance
Phono MM imbalance
-104dB
-85dB
-80dB
-83dB
-101dB
-81dB
-77dB
-78dB
6dB
66dB
66dB
46dB
1k Ω
10 Ω
10 Ω
1k Ω
Output Level / Impedance RCA : 15V/1 Ω or less
XLR : 24V/1 Ω or less
Tape1/2 : 7 V or more
Phones:15V
Total harmonic distortion factor RCA:0.0015%
XLR:0.002%
Tape1/2:0.008%
Phones:0.0015%
Cross modulation distortion factor RCA:0.0015%
XLR:0.002%
Tape1/2:0.0015%
Phones:0.0015%
Crosstalk
R to L :

L to R :

Tuner - Tape :
-82dB(1kHz)
-62dB(10kHz)
-76dB(1kHz)
-65dB(10kHz)
-101dB(1kHz)
-98.5dB(10kHz)
Frequency characteristic
Phono MC:

Phono MM:

Line system :
6 Hz to 121 kHz -3dB
60 Hz to 22 kHz -0.1 dB
3.3 Hz to 157 kHz -3dB
70 Hz to 39 kHz -0.1 dB
4.4 Hz to 205 kHz -3dB
30 Hz to 65 kHz -0.1 dB
External dimensions Width 482x Height 95x Depth 290 mm
Weight -
Sold Separately Remote control