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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These 3, in particular, sounded really, really good. People are building clones and ditching their ‘real deals’ because they sound better.

HWD4558 Datasheet

It’s a little relieving to dataseet that some of the opamp chip gurus were willing to let this out of the bag. There are over 40 different dual op amp chips available. Even the slew rates, which some believe gives a hint to what makes the ‘ good, were all different.

May 23, 3. And, of course, this is because they all meet the same specifications. In addition, the JRCD was used in tons of Japanese audio equipment at about the same time, so a junky cheap Japanese stereo or clock radio could have several hidden inside it.

May 23, 1. Do you already have an account? On the other hand, “better” and “vintage” aren’t necessarily the same thing, even though they get jumbled together in our sorry little heads. Jun 3, The old pedal was not superior to the new 4558o in any way, in fact, it was inferior in ways. 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 have time to sell chips or small parts.


The TL drives things harder and it is tighter and crisper. I will go as far to say Catasheet ‘s sound so similar I doubt anyone could hear a difference in a blindfold test. What we could all really wish for is that large-scale pedal datahseet would actually do LISTENING tests on these “identical” parts, rather than just buying whatever is cheapest at the moment. May 24, 5. When datasheet order these, you get parts that are 455p “JRC”. Jun 4, And I started probing really deep around the time that Analogman started offering their wares, oddly enough.

All had the socket installed, and were cooked 2 output resistor mod. May 24, 7. The reason a carbon comp resistor sounds “better” than a film resistor is the additional noise it adds to the circuit.

P Datasheet, PDF – Alldatasheet

I know I read something recently about the that even when the TS was in original production, there was no single vendor. But I beleive the old JRC version is the holy grail of some even though the datasehet chip in some of the originals may be made by others. If you’re doing this to a TS 10, short out the 1K resistor leading to datadheet 3 of the dual opamp as well.

I didn’t overhear anything.

Cheap 4558 datasheet deals

I guess I’ll check back in 10 years from now and see how things datasheer changed. The LM sounds great in there and it is a horrible opamp by todays standards. There is nothing magical about the “new old stock” JRC that constitutes spending too much money for a “vintage chip”.


May 24, It’s a demonstrable fact that the tone quality of op amps varies significantly. Early TS’s have the Ibanez R “trademark” logo which some people seek. One of the 9’s was beefed up with better i. May 23, 2. I sent Analogman my TS-9 several years ago and had him replace the chip and beef up some weak spots with no other mods and it came back as he described: I yanked it out and put it in my TS5. As far as ‘s in general I will say this. Does true “New Old Stock” matter?

The TL has a lot higher input impedance extremely higher actually. Remove the compensation cap and put a TL in there with the rest of the circuit unmodded and it sounds awful.

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. I don’t think we’ll see a pedal guru doing any sort of semi-scientific chip preference test any time soon though There are probably 3 that most guitarists would agree sound ‘bad.

I attribute the superior tone to the builder of the box. There’s a tremendous difference between being able to detect a difference and being able to specify the cause of the difference.

The clone had premium caps as well. There are millions of these vintage chips out there in old 70’s electronics junk.

Ben HarmlessJun 4, And is anyone aware that the TS7 has the “correct” chip and output resistor values?