Standard PM-403W amplifier

 

General:

Around 1973 issued amplifier for European markets made by 'Standard Electric' company Japan.

This amplifier is electronic identical to the Superscope A-245.

front ^

 

Owners manual:

Brochure of the Superscope A-245 identical to this amplifier

 

interior ^
 

special futures:

This amplifier comes with DIN input/output sockets.
Light and small footprint amp. Wood case.
Well build and good parts used.
This amp employs all silicon transistors.
 

power section ^

 

Specifications:

Power output: 10 watts per channel into 8 Ohms (stereo)

Frequency response: 20Hz to 40kHz

Total harmonic distortion: 0.5% At RMS output,

Damping factor: 30

Input sensitivity: 2.5mV (MM), 150mV (ceramic), 100mV (line)

Signal to noise ratio: better than 60dB (MM), 70dB (line)

Speaker load impedance: 8 Ohms (minimum)

Semiconductors: 18 x transistors, 10 x diodes

Dimensions: 14-11/32 x 7-1/8 x 4-9/16 inches

Weight: 8lbs

Year: 1973

4 x DIN input, 4x DIN output for European version.

Silicon Toshiba plastic power transistors ^

 

Schematic:

click here to download the service manual of the Standard PM403W (Superscope version)

 

PCB back ^
 

Modifications:

You may replace some diodes, capacitors and resistors in the power supply and power rail.
After modification this amp is capable of producing 2x 15 Watts RMS.

 

 

Back Panel with DIN speaker connectors ^

 

Sound:

The sound is very good for such a small amplifier.

 

© Hans Hilberink - PE1MMK ® 2003 - Last update: 10-09-2016.