ASUKI SL58P SL58C (Samsung, made in Korea)

Hello

i've got a old (about 1980) pre ampli and Amplifier ASUKI SL58
I looking for any information about it (schematics, brochure, SM)

The power transistor are : 2SB656 and 2SD676

a lot of pictures here :
https://goo.gl/photos/cxds5d42VsgxMqPaA

could you help me.