Realistic StA-100 driving mono

[Eloi MV]

I just got a realistic STA-100 on the cheap. Cleaned it, but cannot find the problem as to why it works only in the right channel.


If I plug my speaker LL and RR in the speaker set 1, only right will play if I select speaker set 1 output.

If I select Rev A output, only left speaker will play.

If I plug one speaker in right speaker set 1 and one speaker in right speaker set 2 and choose A+B output, both will play (mono).

All capacitor seems fine, and both channel play when headphones are plugged in.

Any tips ?

Thanks !

 

[cademan]

You came here for answers but first you will get questions.

Do you want to tackle this yourself?
What is your level of expertise?
Do you own any test equipment and tools? Meter and soldering iron?

It could be anything from dirty switches or fuses to bad transistors, diodes, capacitors etc. You will either have to do some basic troubleshooting yourself or take it to a shop.

 

[Eloi MV]

I have meter and soldering iron, I have change some capacitors in the past so I know some basics. I have also change all the fuse.

Thank you !!