Sony ST4950 Tuner

General:

Around 1980 Sony company came with its ST4950 high quality tuner on the European market. In some respect it was a competitor to the cheaper Luxman tuners.

 

Special futures:

The Sony ST4950 tuner incorporates special custom Sony IC IF amps as you can see on the photo. It has a 4 gang varicap on the Alps front-end.
It has standard Hitachi ICs for stereo and FM demodulation. Also a LF filter block is on the pcb. The power supply is simple. It has a hi-blend switchable filter. A multipath switch is available.
AM reception is also an option.

Schematic:

 

Sound:

The sound is great and reception is good.

 

Modifications:

Electrolytic caps can be replaced and cooling of the power supply transistor can be improved.

© Hans Hilberink - PE1MMK ® 2003 - Last update: 15-01-2010.