AudioSonic WS-101 amplifier

 

General:

Around 1970 issued amplifier for European markets made by 'Hakkoh Denshi Co Ltd Japan' company Japan.

front ^  (photo Sonny Soerabaja)

 

Owners manual:

This amp is also known as model # DA-1000.

Manual not yet available.

 

interior, very well built and very good pcb ^
 

special futures:

This is a DIN input/output socket version. There are models of this amplifier with RCA input/output sockets.
Light and small footprint amp. Wood case. Well build and good parts used.
This amp employs all silicon transistors.
 

Specifications:

Distortion (THD 20Hz - 20kHz) < 0.1% at continuous output per channel: 10 Watts RMS per channel.
Speaker impedance: 8~16ohms
Signal/noise ratio: 85dB power amp. section
3 x DIN input. RIAA phono amp. incorporated.

Power transistors ^

 

Schematic:

not yet available

2SC1098 ^
 

Modifications:

This amp was originally designed for the use of germanium TO-3 power transistors, as you can see in this model there holes drilled
on the heatsink for the use of plastic silicon power transistors, something you see very often in this kind of designs.

You may replace some diodes, capacitors and resistors in the power supply and power rail.
After modification this amp is capable of producing 2x 12 Watts RMS.

 

interior after update ^

White version with Tuner ^

More info about this Tuner model TU-101: click here.

 

Sound:

The sound is very good for such a small amplifier.

 

© Hans Hilberink - PE1MMK ® 2003 - Last update: 11-11-2018.