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There are other factors like the slew rate that may contribute as well, but to me the input impedance difference is the 45558p. And, of course, this is because they all meet the same specifications.

JRC4558 myths…

It’s a little relieving to know that some of the 455p8 chip gurus were willing to let this out of the bag. Log in or Sign up.

Great points made, truly. But even all of these years later, the mystique around the ‘ still amazes me.

Robbie WMay 24, There is nothing magical about the “new old stock” JRC that constitutes spending too much money for a “vintage chip”. This is where the rec. Do you already have an account?

I may even run datasheet new tests with more chips, to see if I can find something better than my beloved TL There were zillions of the real “JRC” made when it was current.

May 23, 2. I feel this is the primary reason for the audible differences. I’m just wondering where things currently stand.

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We have not lost technology over the years, datashewt we have with tubes, we have taken the same technology and made it cleaner in the case of silicon. All of the ‘ variants sounded quite similar and ‘good’.


So I don’t buy the Holy Grail theory. Back to theI think that people are just applying NOS ideas to the chips like they do tubes. And I started probing really deep around the time that Analogman started offering their wares, oddly enough. Your name or email address: Put a TL in there and be prepared for an overly bright and brittle sound. TL my fave The LT was also kinda cool sounding, but not consistently so in the handful of pedals that I tried it in.

There are probably 3 that most guitarists would agree sound ‘bad. There is a post above that is proof positive of this. Dataxheet 24, 7. Are the misinformed still spending 30 bucks or more for a “NOS” chip, and 2 “brown sound” resistors?

As far as ‘s in general I will say this. I wish I could say that it sounded noticably better but 4558o TL that I put in the amp did!

Some circuits sound better with inferior spec’ed chips. On the other hand, “better” and “vintage” aren’t necessarily the same thing, even though they get jumbled together in our sorry little heads.

There is some confusion datqsheet present over what is a true or “vintage” JRC However, I think the nature of how silicon works vs.

Conversion to TS – this seems to be a perennial hot one. 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: Jun 4, dxtasheet I attribute the superior tone to the builder of the box.

They had datasheer in common. What we could all really wish for is that large-scale pedal manufacturers would actually do LISTENING tests on these “identical” parts, rather than just buying whatever is cheapest at the moment. The clone had premium caps as well. May 24, 8. I don’t think I went darasheet with the cost on this one. I’m just curious, because most pedal experts seem to concur that both old and current production chips from different parts of Asia all tend to datashert consistently the same.


Saying that the ‘ is the best dual opamp for a TS datasheey pedal is like winning the lottery the very first time you play. I don’t think we’ll see a pedal guru doing any sort of semi-scientific chip preference test any time soon though May 24, 5.

May 24, 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.

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Personally, I think it’s the build of the pedal and the sum of all components. Jun 3, All had the socket installed, and were cooked 2 output resistor mod. The Rat2 is the same way. If you want “vintage Tube Screamer” then this is the best choice probably. I started researching TS’s quite a long time ago. If you hear a difference then by all means go with what sounds best to you. But I beleive the old JRC daatsheet is the holy grail of some even though the actual chip in some of the originals may be made by others.