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Thanks Cranky! Sure it's only my headache :) The repairman said such a chip is used in car-audios. He is mostly car-audio pro, so we decided to wait for a donor TDA7433. If we got nothing we'll try to bypass it. Have a good weekend!

How it is done (if there is simple answer)?? I haven't found the chip at ST site among samples or regular parts and afraid it is out of production. Don't know what to do...

Hi everybody! I tried to diagnose my dead sub myself, got a little SC at TDA7295's power leads and decided not to try my luck and gave the sub to a specialist for repair. He told me on phone that logic chip TDA7433 was dead. Now we are in search of the chip substitute. I'll let you know when...

Thanks Cranky. I have not a signal injector right now so i only can say that both inputs keep silence. Maybe i'll find a signal injector and come back later.

Hello everybody! Can you help me with amplifier electric scheme - my MX5021 doesn't work. It worked two weeks after mode but suddenly stopped. It turns on/off, leds are on but no sound but that dam hiss which always was there -before and after mode. Any ideas and leads highly appreciated.

Hello everybody! Can you help me with amplifier electric scheme - my MX5021 doesn't work. It worked two weeks after mode but suddenly stopped. It turns on/off, leds are on but no sound but that dam hiss which always was there -before and after mode. Any ideas and leads highly appreciated.

Thank you! I've checked indeed - all seems to be correct. Let me explain more about that hiss: as I posted above sub plays music without problem but produces that noise regardless volume level. You can hear it from 30 - 40cm from sub in silence. Maybe I'm paranoidal about that? People, can...

I'll start from the end. 1. Opamps seem to be okay as I temporarily replaced three 2134 chips to old ones to compare. The result is the same - the hiss from sub at any volume level, even with no sound source connected. The sub never hissed before the mod. 2. Maybe I'm wrong, but I think I...

Let me tell to everybody the sad story. I've just finished my MX-5021 mod. 1. The Sub: - I swapped all EL caps to Nichicons (the big ones changed to bigger) and C61, C54 to 0,33uF MKP's. - Swapped all opamps to OPA2134PA's. - Changed sub's cable. - Changed transformer to toroidal one. 2...

Thanks a lot, CRANKY!

2cranky Hi again! Listen, I've got all film caps to swap originals in crossovers. As soon as I have an old version of MX2150 there is a different crossovers design (2 inductors and 3 caps) as Jimmy has modded. It's funny but MKP cap of 47uF too big and cannot be installed inside speaker :)...

@cranky I have first revision of mx2051 as Jimmy does and I received all MKP's I need. So i'll just swap them all. Thanks :)

2cranky Thanks! Anyway, don't you think that swapping cheap elco caps with MKP films of the same capacity wold be better?

Hi. Anybody who knows, please explain what is the theoretical purpose of bypassing with o,47mfd MKP in satelite filter (all from page 6 of 10 of the article) . Thanks

And please, Marmes, how did you get the original transformer off the glue??? Thanks