Texas Instruments P Operational Amplifiers – Op Amps are available at Mouser Electronics. Mouser offers inventory, pricing, & datasheets for Texas. P Semiconductors are available at Mouser Electronics. Mouser offers inventory, pricing, & datasheets for P Semiconductors. Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. PRODUCTION DATA information is current.

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P Datasheet PDF – KEC

I may fatasheet run some new tests with more chips, to see if I can find something better than my beloved TL Personally, I think it’s the build of the pedal and the sum of all components.

However, the odds that they’ll hear a difference are very good, and if there’s an audible difference, multiple listeners will have consistent preferences. There are over 40 different dual op amp chips available.

I didn’t overhear anything. Jun 3, I’m just curious, because most pedal experts seem to concur that both old 45558p current production chips from different parts of Asia all tend to sound consistently the same. If you’re doing this to a TS 10, short out the 1K resistor leading to pin 3 of the dual opamp as well.


p datasheet & applicatoin notes – Datasheet Archive

May 23, 3. I think the high end stereo guys, in particular, have been suseptable to this sort of pseudo-scientific clap-trap. If you want a JRC chip for a project, get a new chip from Steve at Small Bear Electronics who sells them cheap sorry we dont datasjeet time to sell chips or small parts. What have y’all overheard at the musician’s watercooler discussions?

JRC4558 myths…

We have all gotten used to that noise, so it sounds better. You must log in or sign up to reply here. The TL has a lot higher input impedance extremely higher actually.

May 23, 1. May 23, daasheet.

There is some confusion at present over what is a true or “vintage” JRC The TL drives things harder and it xatasheet tighter and crisper. The clone had premium caps as well. No, create an account now.

May 23, 4. If you want “vintage Tube Screamer” then this is the best choice probably. When you order these, you get parts that are labeled “JRC”.

We have not lost technology over the years, like we have with tubes, we have taken the same technology and made it cleaner in the case of silicon.

The LM sounds great in there and it is a horrible opamp by todays standards. Back to theI think that people are just applying NOS ideas to the chips like they do tubes. The thing is, op amps are actually fairly complicated devices internally, and can have widely varying behaviors for slew rate, noise, etc, while being “rated” the same in identical conditions. There are other factors like the slew rate that may contribute as well, but to me vatasheet input impedance difference is the biggie.


Several electronics suppliers list the JRC My unscientific conclusion was that the best chip probably has yet to be found. I will go as far to say ALL ‘s sound so similar I doubt anyone could hear a difference in a blindfold test.

All of the ‘ variants sounded quite similar and ‘good’. I started researching TS’s quite a long time ago. There were zillions of the real “JRC” made when it was ddatasheet.

HWD4558 Datasheet

Definitely better than some of the garbage op amps that were used in the early TS9 reissues. And, of course, this is because they all meet the same specifications.

Great points made, truly.