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Just my actual system: A AKM DAC+yamaha PC-4002m and JBL L150a and good rock and loud music. :banana:

And yes it was a bad soldering joint... This amp is really a beats with feets of clay.

Yes, swapping, changing wires. After few hours suddenly warming up , the gain return normal for few minutes. I suspect bad soldering joint in input card. Will testing that way next days. Thanks for your help amr2. Vintage gears are sometimes boring. Will see for yam p5000s. No problem with new...

Do you think the AOP NE5532 can be guilty?

I think in xlr there's about -2 db in right channel.

Already do:-deoxit all the switch ground-mono/stereo and attenuators. No change. In xlr the right still less powerfull than the left. Strange...

Hy Friends, I've trouble with my Yam. Since few days, the right channel give no sound only with jack input. The amp is connect with rac to jack 6.3 sommer cable to an DAC /preamp in unbalanced outputs. The right channel have very very little sound with full gain. Meter stays at 0. The DAC have...

Finally, after checking the amp, it was the mains power wire that was damaged at the power outlet. Hope for him, that the amp haven't other issues after that. Thanks for yours advice Friends!!

:rflmao:A ghost, why not, indeed it's an very old house. But, why sometimes the amp power on with no sound? I'm not near my brother, he live in the north of France and me in the south. So i'm mailtech. Thanks for this first advice.

Hello friends, My brother owns a Yam pc-2002m. Yesterday in the middle of the night, the amp switched off, the amp soudainly trips the electrical circuit panel of his house. Since, the amp sometimes turns on and works for a few minutes, sometimes, lights up but there is no sound or nothing...

DC offset is good for both channels. Attenuator is ok.

I swapped the "main board" and the weak channel stay the same. Iin XLR input the output in channel B is weak, in jack input, the sound level is the same for both channels but there is a variable noise like ground noise. This amp was mainly used in BTL mode.

I've swapped the 2 main boards and the problem stay in the same channel, so i think taht the problem is not on those boards. Maybe the "in circuit boards"?

I've tested the attenuator they are ok. Give both the same values.

Thanks Mech986, I've check all the board, no visible soldering problem. Just a wire little disconnneted. But no change for the sound after resoldering it..Always less high and mid sound .I don't know how to check bias circuit. No change of transistors-resistors. There are 100% originals, jsut...

Maybe, but tomorrow, the volume stay louder permanently. So i on't know what cheking.

Meter level peak is less on the faulty channel.

Yes Avionics, i swap LR speakers and source=same results. Lack is intermittent when amp run and become hot.

The lack of sound seems to be intermittent. When the amp become hot the level are equal. On vu-meter the peak range on channel B is less than the A.

Post updated. Good advice Mark B.

Hello Friends, Just have the time to finish the yam. Now the amps looks great. But, after few test with dummy load, i connect to some old speakers for testing the sound. I found that one channel have a lack of sound. The sound is attenuated, less high-mid sound, like boomy sound. The other one...

Dear Friends, I'm back after few weeks with health trouble. Just have the time to finish the yam. Now the amps looks great. But, after few test with dummy load, i connect to some old speakers for testing the sound. I found that one channel have a lack of sound. The sound is attenuated, less...

Hello friends, I fall in love with the beauty of this loudspeakers, but this is the firts time i saw them. Can someone tell me more about them? Thanks

For now the front panel is about to do a lifting with new anodizing. So i can't test the aop yet. If i'll change them, i'll think about your advice Beau Geste.

NE5532 is still available for few eur/usd. Why Rottalpha? Should i change them anyway?