For performing any modification steps I want to have the genuine circuit diagrams. Maybe one of the member can upload this.
in post #51 under
https://www.diyaudio.com/community/threads/2sj49-2sk134.1188/page-3
is mentioned, that one of the most used circuits was choice for the power amp.
This URL in German I have found concerning this models
http://www.hifi-forum.de/viewthread-84-24940.html
in post #51 under
https://www.diyaudio.com/community/threads/2sj49-2sk134.1188/page-3
is mentioned, that one of the most used circuits was choice for the power amp.
This URL in German I have found concerning this models
http://www.hifi-forum.de/viewthread-84-24940.html
Attachments
Hi, I have here an English review from HiFi News November 1992 which I have uploaded for you. This is the most technical detail on the amp I have been able to find. No circuit diagram or service manual though.
I also had encounter two monoblocks of this with 2 pairs of K1058/J162 output with massive trafo and heatsink. Burnt board and can't find reference schematics with some smd parts and not repair friendly construction especially board mounting of driver and output mosfet.
In the attachment the ROK-S1 service-manual include the schematics. The circuit diagram is very close to those of the German magazine ELRAD 5/90 (5/1990) and a second issue several years earlier (between 1986 and 1989 maybe one of the member know the issue).
First diy project was equipped with Hitachi 2SJ49/2SK134 in the output buffer stage and the second diy project from ELRAD 5/90 with BjT's from Mororola's MJ series.
Additional I want to have several internal images of ROK-S1 (power amp PCB, transformer, power supply and so on).
Thank you very much for upload.
P.S.: under
https://musikelektronik.jimdofree.com/hobby-elektronik/bücher/elrad/
there are to find images of covers from all exist ELRAD magazines.
First diy project was equipped with Hitachi 2SJ49/2SK134 in the output buffer stage and the second diy project from ELRAD 5/90 with BjT's from Mororola's MJ series.
Additional I want to have several internal images of ROK-S1 (power amp PCB, transformer, power supply and so on).
Thank you very much for upload.
P.S.: under
https://musikelektronik.jimdofree.com/hobby-elektronik/bücher/elrad/
there are to find images of covers from all exist ELRAD magazines.