Audio Database

The

Pioneer SM-70
25,000yen(around the 1969 time)

Description
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Handy power amplifier which uses a silicon transistor.

The semi- complimentary type hardwired-connection drive which uses 3-fold diffusion mesa type silicon power transistor is adopted.

Two output-terminals are carried.
Moreover, since Input sensitivity can be switched to three positions, it can unite with the preamplifier to combine.

Rear

Rating of a mode
Form Stereo power amplifier
Circuit system Pure complimentary SEPP
Music power (IHF) 120W (4ohm)
85W (8ohm)
Effective output
1kHz One-side-channel operation : 40W/40W (4ohm)
32W/32W (8ohm)
Both channel operation : 31W+31W (4ohm)
27W+27W (8ohm)
THD 0.5% or less (at the time of an effective output)
0.05% or less (at the time of 20W/20W output)
Cross modulation distortion 0.5% or less (at the time of an effective output)
Output bandwidth (IHF) 15Hz - 60kHz
Frequency characteristic 15Hz-60kHz}0.5dB
Input sensitivity 0.5V, 1V, 2V
Load impedance 4ohm-16ohm
Dumping factor 30 (8 ohm, 1kHz) or more
A hum, a noise 100dB or more
Power consumption Maxima: 270W
Dimensions Width 300x height 118x depth of 254mm
Weight 5.3kg