Hi All,
I'm putting this old crossover back into use after long term storage. It fires up fine, but it has no highs in the right channel high pass output, the same problem in front and rear sections of the crossover.
I'm hoping someone out there has a schematic for this unit, an MTX RT-X02. Probably a '90's product.
-Chris
I'm putting this old crossover back into use after long term storage. It fires up fine, but it has no highs in the right channel high pass output, the same problem in front and rear sections of the crossover.
I'm hoping someone out there has a schematic for this unit, an MTX RT-X02. Probably a '90's product.
-Chris
Check the basics, solder joints, RCA jack condition, clean pots, etc. A schematic will be hard to get. Just open it up and look it over. There's very little to go wrong in one of those.
Hi jkrokenberger,
Thank you. Yes, did all that. It turned out to be small piece of wire between the pins of an op amp. Once extracted, the unit returned to its normal happy self.
So, having solved that issue, I turned around and changed some op amps. The FET input ones got OPA2134, the quad an OPA4134 and some of the others turned into NE5532. The distortion and noise dropped to low levels. It sounds more clear on the high notes, which is what I was aiming for.
Now after the op amp transplant, it measures around 0.00030% THD, and that is the worst measurement from it, outside of it's case. Just about to test it all buttoned up. The power supply voltage fell a little more, but its running cool, so I don't need to worry about it.
-Chris
Thank you. Yes, did all that. It turned out to be small piece of wire between the pins of an op amp. Once extracted, the unit returned to its normal happy self.
So, having solved that issue, I turned around and changed some op amps. The FET input ones got OPA2134, the quad an OPA4134 and some of the others turned into NE5532. The distortion and noise dropped to low levels. It sounds more clear on the high notes, which is what I was aiming for.
Now after the op amp transplant, it measures around 0.00030% THD, and that is the worst measurement from it, outside of it's case. Just about to test it all buttoned up. The power supply voltage fell a little more, but its running cool, so I don't need to worry about it.
-Chris
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