Op-Amp Swap Question for Celestion System 6000 Controller

[IncognitOz]

Hi Team,
I am restoring an original Celestion System 6000 Active Controller / Crossover (c. 1990).

The PCB currently has a mix of TL072CP and NE5532P dual op-amps. I plan to install machined DIP-8 sockets and replace all stock ICs with Burr-Brown OPA2134PA (or TLE2072) to lower the noise floor.

Op-Amps: Considering the OPA2134PA is unity-gain stable (8 MHz GBW, JFET input) and the board has local decoupling caps, do you see any potential stability or oscillation issues when replacing the NE5532P positions with OPA2134PA in this circuit?

Looking closely at the PCB, I noticed a local decoupling capacitor connected to Pin 4 on each op-amp. Is this bypass capacitor what ensures circuit stability and prevents high-frequency oscillation when upgrading to modern op-amps like the OPA2134?

Thank you very much for your help.

 

[Redacted]

The Stereophile review of 1989 said "Electrical noise levels were very low; for example, -111dBA referenced to a IHF 0.5V output. Hum levels were better than 85dB down."

I'm wondering if you are chasing the wrong problem?

 

[IncognitOz]

The Stereophile review of 1989 said "Electrical noise levels were very low; for example, -111dBA referenced to a IHF 0.5V output. Hum levels were better than 85dB down."

I'm wondering if you are chasing the wrong problem?

Thanks for your response! You're definitely right about the original specs from back in the day.
However, my main objective here is a full 35-year restoration: replacing all aging electrolytic capacitors, servicing the potentiometers with DeoxIT F100L, and bringing the unit back to a fresh, reliable baseline as a mandatory first step.
Regarding the op-amps: since the stock ICs represent late-1970s technology, my thought was to upgrade to modern op-amps with faster transient response (Slew Rate) and a lower noise floor.
My specific question is: Can a swap to modern alternatives like the OPA2134PA or TLE2072 work safely as a direct plug-and-play drop-in, or would you recommend leaving the stock op-amps untouched altogether in this specific circuit?
Thanks

 

[Redacted]

I get changing the caps and cleaning/lubing the pots... I'd do that first and measure the result.

What is "faster transient response (Slew Rate)" going to give you? And if the noise on the original is meant to be as inaudible as the numbers suggest, what is "a lower noise floor" going to do? The OPA2134PA is a 1990's chip.

 

[JayGilb]

If you're doing a restoration I would just socket the DIP-8s and replace with new TL072CP and NE5532P.
Lots of fake opamps out there especially the Burr Brown, so why not stick with the original spec components ?

 

[somebodyelse]

It wasn't only Croft getting parts from RS back then I see. I'd stick with the originals too unless they've actually failed.

 

[fpitas]

You might be surprised how good the NE5532 was:

Does Op-amp Rolling Work?

When I post my last video on review of Douk A5 amplifier, I mentioned that rolling (changing) op-amp ICs in there is fruitless. I got have a dozen comments under that video in youtube asking why so I thought I experiment again with the A5. Note that I have done the same testing with both DACs...

www.audiosciencereview.com

Another vote to stick with them.