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2006-12-16 by gil_we
Hi all, I'm trying to fix my OB Matrix6R, on which the left channel doesn't play. The last stage is a NEC C4082C dual opamp (datasheet attached to Files section). I wonder whether it is possible to replace it with a 4558 or a TL072 opamp, safely ? There is also one 4053 that I suspect. In case I need to replace it, what could be a good substitue for it in case it can't be found ? Thanks for any advice.
2006-12-16 by no.freq@free.fr
Hi, You'd better use a TL082 instead of the 072. You'll usually find that the right replacement op amps will end with the same numbers. Concerning the 4053, I bet it's a CD4053, so you may not have any problems in finding one. And one last good thing, while you're at desoldering chips: use (golden) sockets ! Cheers, Michel
> Hi all, > > I'm trying to fix my OB Matrix6R, on which the left channel doesn't > play. The last stage is a NEC C4082C dual opamp (datasheet attached to > Files section). > > I wonder whether it is possible to replace it with a 4558 or a TL072 > opamp, safely ? > > There is also one 4053 that I suspect. In case I need to replace it, > what could be a good substitue for it in case it can't be found ? > > Thanks for any advice. > > > >
2006-12-16 by gil_we
Thanks, Well, I found that it is not the opamp. Actually, aside from the 4053, there's also an IC tagged "C741C" in at the same circuit - would that one be hard to find ? any equivalents ? --- In vintagesynthrepair@yahoogroups.com, no.freq@... wrote: > > Hi, > > You'd better use a TL082 instead of the 072. You'll usually find that the right > replacement op amps will end with the same numbers. > > Concerning the 4053, I bet it's a CD4053, so you may not have any problems in > finding one. > > And one last good thing, while you're at desoldering chips: use (golden) sockets > ! > > Cheers, > > Michel > > > Hi all, > > > > I'm trying to fix my OB Matrix6R, on which the left channel doesn't > > play. The last stage is a NEC C4082C dual opamp (datasheet attached to > > Files section). > > > > I wonder whether it is possible to replace it with a 4558 or a TL072 > > opamp, safely ? > > > > There is also one 4053 that I suspect. In case I need to replace it,
> > what could be a good substitue for it in case it can't be found ? > > > > Thanks for any advice. > > > > > > > > >
2006-12-16 by no.freq@free.fr
So, if it's an 8 pin dip one, this could be a LM741... ! If you're not sure, try to do some minor reverse-engineering, it may be quite easy finding out the power supply pins first (V+ = pin 7 and V- = pin 4 on the 741), then, you should find some basic structure around it, so you can verify if it can be an LM741 or not. The complete 741 pinout may help you...
> Thanks, > > Well, I found that it is not the opamp. Actually, aside from the > 4053, there's also an IC tagged "C741C" in at the same circuit - > would that one be hard to find ? any equivalents ? > > > > > --- In vintagesynthrepair@yahoogroups.com, no.freq@... wrote: > > > > Hi, > > > > You'd better use a TL082 instead of the 072. You'll usually find > that the right > > replacement op amps will end with the same numbers. > > > > Concerning the 4053, I bet it's a CD4053, so you may not have any > problems in > > finding one. > > > > And one last good thing, while you're at desoldering chips: use > (golden) sockets > > ! > > > > Cheers, > > > > Michel > > > > > Hi all, > > > > > > I'm trying to fix my OB Matrix6R, on which the left channel > doesn't > > > play. The last stage is a NEC C4082C dual opamp (datasheet > attached to > > > Files section). > > > > > > I wonder whether it is possible to replace it with a 4558 or a > TL072 > > > opamp, safely ? > > > > > > There is also one 4053 that I suspect. In case I need to replace > it, > > > what could be a good substitue for it in case it can't be found ? > > > > > > Thanks for any advice. > > > > > > > > > > > > > > > > >
2006-12-16 by no.freq@free.fr
Don't know if you already have it but the schematics should help : http://www.tcapp.com/pub/synths/oberheim_heaven/matrix6/docs/ (quite bad quality, but you can actually read things like "TL082" etc ;)
> > Thanks, > > > > Well, I found that it is not the opamp. Actually, aside from the > > 4053, there's also an IC tagged "C741C" in at the same circuit - > > would that one be hard to find ? any equivalents ? > > > > > > > > > > --- In vintagesynthrepair@yahoogroups.com, no.freq@... wrote: > > > > > > Hi, > > > > > > You'd better use a TL082 instead of the 072. You'll usually find > > that the right > > > replacement op amps will end with the same numbers. > > > > > > Concerning the 4053, I bet it's a CD4053, so you may not have any > > problems in > > > finding one. > > > > > > And one last good thing, while you're at desoldering chips: use > > (golden) sockets > > > ! > > > > > > Cheers, > > > > > > Michel > > > > > > > Hi all, > > > > > > > > I'm trying to fix my OB Matrix6R, on which the left channel > > doesn't > > > > play. The last stage is a NEC C4082C dual opamp (datasheet > > attached to > > > > Files section). > > > > > > > > I wonder whether it is possible to replace it with a 4558 or a > > TL072 > > > > opamp, safely ? > > > > > > > > There is also one 4053 that I suspect. In case I need to replace > > it, > > > > what could be a good substitue for it in case it can't be found ? > > > > > > > > Thanks for any advice. > > > > > > > > > > > > > > > > > > > > > > > > > > > >