Tecknics low volume

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Hi folks
I have a Tecknics SU-G86 amp that produces very low volume no matter the source.
I have a small understanding of electronics and I expect the problem is likely in the output stage but wondered if there is perhaps a known issue with this amp or if I should "look" at any particular components. I know it's old-ish but I'd like to get this working again.
John L.
 
Look at the rear panel, upper left. Isn't there a pair of jacks with links in them? They are the preamp out and power amp in jacks. If you do, pull the links out and connect your source material to the power amp in jacks. This will test only the power amp. Does it come out OK now or still diminished?
 
So, I have figured this out. The amp came with a tuner, CD player and an EQ. I wondered if the EQ needed to be connected and when I did VOILA! So I guess what Enzo said is correct except it's EQ in & out. I suppose there is normally a bridging connector there if you don't want to use the EQ? Does anyone know if simply bridging the RCA's with cables would be ok? I suspect it would be because you can turn off the EQ and the amp works as it's supposed to.
 
picture...you could have just search the web
 

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