Audio Database

The

ROTEL RA-810
55,000yen(around the 1970 in-the-early time)

Description
 
The Integrated Amplifier which adopted 2 power-source schemes and the power amplifier circuitry of the whole page hardwired connection.

The fraction of the preamplifier consists of the three-step hardwired-connection circuitries and E-E feedbacks using the silicon transistor of the low-noise, and the equalizer property that stability is high is realized.
Moreover, since the three-step hardwired-connection circuitry of only a PNP transistor is adopted, the noise is decreasing.

The dubbing circuitry where the sound recording from a tape recorder to another tape recorder is easy is carried.

Since the protection network which protects a speaker and a transistor is taken in, a speaker, a transistor, etc. are protected from the outage by short-circuit of a speaker termination etc.


Rating of a mode
Form Solid-state stereo amplifier
<Main-amplifier part>
Music power (IHF) 4ohm: 180W
8ohm: 125W
Effective output (RMS) 4ohm: 60W+60W
8ohm: 40W+40W
THD 40W output: 0.3% (20Hz - 20000Hz)
Cross modulation distortion 40W output: 0.2%
Frequency characteristic 4Hz - 75,000Hz, and +0 -3 dB
Output band property 5Hz - 50,000Hz
Dumping factor 35 (8ohm)
Input sensitivity/impedance 1V/33kohm
Speaker impedance 4ohm-16ohm
<Preamplifier part>
Output voltage 1V-3V
THD 0.1%
Frequency characteristic 3Hz - 50,000Hz, and +0 -3 dB
S/N ratio Phono1, 2:65dB
AUX1, 2, Tape In: 75dB
Remains noise 0.5mV
Input sensitivity/impedance Phono1:2mV/50kohm
Phono2:2, 4, 8mV/30, 50, 100kohm
Tuner, AUX1, 2, Tape In:115mV /, 40kohm
Tape DIN: 330mV / 100kohm
Equalizer Deflection of less than ±0.5dB from a RIAA standard curve
Loudness 50Hz:+10dB
10kHz:+4dB
A high filter 10kHz:-10dB
A low filter 50Hz:-10dB
Muting 10kHz:-20dB
Bass 50Hz : ±10dB
Treble 10kHz : ±10dB
<Synthesis>
Supply voltage 100V, 117V, 220V, 240V, 50Hz/60Hz
Power consumption 130W
Dimensions Width 420x height 140x depth of 304mm
Weight 10kg