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If you’re doing this to a TS 10, short out the 1K resistor leading to pin 3 of the dual opamp as well. Great points made, truly. May 23, 3. The LM sounds great in there and it is a horrible opamp by todays standards. Early TS’s have the Ibanez R “trademark” logo which some people seek. The reason that I even started this thread was to try to get a feel on where the whole TS mojo thing stands.

Both have the JRC However, I think the datashert of how silicon works vs. All had the socket installed, and were cooked 2 output resistor mod. Remove the compensation cap and put a TL in there with the rest of the circuit unmodded and it sounds awful.

I put this in the same piles as some of the capacitor, resistor and conductor stuff floating around. And is anyone aware that the TS7 has the “correct” chip and output resistor values? I think the high end stereo guys, in particular, have been suseptable to this sort of pseudo-scientific clap-trap. Jun 3, I yanked it out and put it in my TS5. I don’t think I went overboard with the cost on this one. Does true “New Old Stock” matter? 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.


JRC4558 myths…

Conversion to TS – this seems to be a perennial hot one. Personally, I think it’s the build of the pedal and the sum of all components. The differences between the TL and the are subtle, but there none the less. As far as ‘s in general I will say this.

RCP ICs – in stock to buy, photo, pdf datasheet, rfq, obsolete

They had nothing in common. When you order these, you get parts that are labeled “JRC”. The in a Tube Screamer does have a sound that is good and is what a lot of people find to their liking. There is some confusion at present over what is a true or “vintage” JRC It’s amazing how some of these falsehoods prevail.

The old pedal was not superior to the new one in any way, in fact, it was inferior in ways. 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 datasjeet cheapest at the moment. All of the ‘ variants sounded quite similar 5458p ‘good’. Ben HarmlessJun 4, I don’t think we’ll see a pedal guru doing any sort of semi-scientific chip preference dahasheet any time soon though The clone had premium caps as well.


Oh, and I should add that it’s unlikely listeners will “get the chips right” in say, blind testing adtasheet vintage JRC and new Fairchild. One of the 9’s was beefed up with better i.

Several electronics suppliers list the JRC So I don’t buy the Holy Grail theory. I wish I could say that it sounded noticably better but the TL that I put in the amp did!

There is nothing magical about the “new old stock” JRC that constitutes spending too much money for a “vintage chip”. They were consistently good. I feel this is the primary reason for the audible differences. I tested about 25 different chips back in ’99, in a few 9’s, a few 5’s, and a clone.

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: Back to theI think that people are just applying NOS ideas to the chips like they do tubes. That’s one o’ them boxes what makes yer amp sound real loud innit? May 23, 1.

There are millions of these vintage chips out there in old 70’s electronics junk. Do you already have an account? If you want “vintage Tube Screamer” then this is the best choice probably.