Luxman SQ 700, X, G amplifier

General: 

This amplifier produced in the 1970’s. .

Photos:

 

Special futures:

Schematic:

        

Owners manual

       click here to download the user manual of the SQ700 (X model)

 

Modifications:

Replace broken power transistors with TO-66 transistors 2SC1445 and PNP 2SA765 (Sanken) instead
of 2SA616 and 2SD155 (NEC), or use plastic transistors like 2SB595/2SD525 (Toshiba)
or 2SA1694 & 2SC4467 (Sanken).
The transistors of the pre stages are often noisy. Use BC550/560C or equivialent,
you can get the noise figure below the original specs of Luxman.
On other places in the amp you can use 2SC1775.

 

Sound:

These series of "High Quality" audio components soon got legendary of their outstanding quality and excelent sound performance.
 

Test in Dutch language:

© Hans Hilberink - PE1MMK ® - Last update: 10-01-2012.