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In Reply to: RE: A good review of the OPA2132 IMO (not mine} posted by Tweaker456 on December 30, 2016 at 14:20:55
I used these op-amps in my Sony NS9000 and Classe'534 pre-amp. Both of those units were highly modded. New caps, low temp-co resistors all matched. The biggest change was adding 6800uf to the power pins of each IC op-amp. Sockets let me change out op-amps easy. I had a lot of op-amps to try in those days, one was the OPA-2132. With the power mods they have no sound of their own except for a dark character to the over all sound. They seem fast, with the highs you want and tight bass, but still dark. I replaced them with LM4562's and thought that I had reached Navona. The sound was brighter, like someone had turned on the lights. Now, I could see into the music and the way to the back. I have gone on to change all op-amps in my system to LM's, including my Emovita DAC and Classe' Ten power amps. These both have major power supply mods. I no longer use an analog pre-amp, as my system is all digital inputs now. Like I said, the opa's are OK, but the LM's will blow them away. Good Luck, bobwire
Follow Ups:
The biggest change was adding 6800uf to the power pins of each IC op-amp.
I'd be curious to know how you arrived at 6800uF as the ideal value for placement right at the opamp -V & +V pins. Thanks.
It was by modding a lot of gear. I would always do a power supply up-grade of all the PS caps. Most times I would make them x10 bigger. So, 220uf want to 2200uf. This would almost always make a difference. And I would put 1000-2200uf right on the op-amp power pins. Then one day I realized that I was doing the right thing but to small. I then tried 4700uf on the op-amps and it was good, but not always. The magic would come and go. So, I tried 6800uf and the magic stayed. Even op-amps as old as the 5532 would be smooth, detailed and would seem to disappear, not have a sound that said OP_AMP. Trust your ears. Good Luck, bobwire
If you believe in magic, who am I to question your method? ;-)
I prefer the LM4562's also. Hard to beat for audio use.
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