Hi everyone.
I'm new to this so I hope this is a appropriate thread for my question.
I have a Soundcraft mixing console 1600 series with 24 channals from 1985. I have made some small reapairs on it then a channel begun to crack or sound strange. As a beginner, I just replace the OP-amps with sockets and a new OPs.
I have now realized that it I might be able to modify a couple of channels by simply replace the OP-amps with a "better one".
There are two different OPs on a mono-channel:
4 pieces of TL072CP (for the EQ i believe)
1 piece of NE5534P (for the pre-amp)
So is there any nice OP-amps you will recommend I can try out?
I'm new to this so I hope this is a appropriate thread for my question.
I have a Soundcraft mixing console 1600 series with 24 channals from 1985. I have made some small reapairs on it then a channel begun to crack or sound strange. As a beginner, I just replace the OP-amps with sockets and a new OPs.
I have now realized that it I might be able to modify a couple of channels by simply replace the OP-amps with a "better one".
There are two different OPs on a mono-channel:
4 pieces of TL072CP (for the EQ i believe)
1 piece of NE5534P (for the pre-amp)
So is there any nice OP-amps you will recommend I can try out?
Without having the schematic on hand:
The ne5534 is fine. The tl072 can be improved on (especially if they're heavily loaded) by opa2134 if you need a dip package or by either opa1642 or opa1652 if soic is fine.
The ne5534 is fine. The tl072 can be improved on (especially if they're heavily loaded) by opa2134 if you need a dip package or by either opa1642 or opa1652 if soic is fine.
in a mixing console there are many, many interstage coupling capacitors that can affect the circuit performance long before the quality of op-amps especially in a console of this age.
Thank for taking time to answer! 🙂
DIP i believe it is called, holes in the board, that you stick the "legs" through.
I don't think the EQ usually are under any heavy load. Most of the time it will not go over ±3 dB, in the total of ±15 dB
I do have a schematic, but it doesn't say much to a guy like me 😛
DIP i believe it is called, holes in the board, that you stick the "legs" through.
I don't think the EQ usually are under any heavy load. Most of the time it will not go over ±3 dB, in the total of ±15 dB
I do have a schematic, but it doesn't say much to a guy like me 😛
Yes, there a a few of these in there 😛 I've never needed to change any of those... yet.
But I understand that some most be "tired" by now. Each channel has a unique sound, and personality.
I will probably run into a new problems, once they start to fail :O
But I understand that some most be "tired" by now. Each channel has a unique sound, and personality.
I will probably run into a new problems, once they start to fail :O
Loading an op amp is not about how loud you turn the controls, it refers to circuit impedances.
Your unique channel sounds are more likely the result of capacitors, as turk pointed out. The op amps are not likely getting "tired".
One consideration: if you replace a small number of ICs, it won't matter, but if you were to replace a lot of them, you need to consider power supply. If a new IC draws twice the current as the old, then the demand on power supply is similarly increased. In a 24 channel board, that can add up.
You might want to define "better" for yourself, and what performance changes you expect.
Your unique channel sounds are more likely the result of capacitors, as turk pointed out. The op amps are not likely getting "tired".
One consideration: if you replace a small number of ICs, it won't matter, but if you were to replace a lot of them, you need to consider power supply. If a new IC draws twice the current as the old, then the demand on power supply is similarly increased. In a 24 channel board, that can add up.
You might want to define "better" for yourself, and what performance changes you expect.
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