1980 Texas Instruments RC4558P vs current TI-RC4558P
- Thread starter JMP/HBE
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PFDarkside
of the Forum
Re: 1980 Texas Instruments RC4558P vs current TI-RC4558P
Everything makes a difference, but enough for you to hear it and enough for you to care?
Everything makes a difference, but enough for you to hear it and enough for you to care?
JMP/HBE
Well-known member
Re: 1980 Texas Instruments RC4558P vs current TI-RC4558P
Im only interested in the new & old Texas Instruments RC4558P.
GoldenVulture
Braindeadologist
Re: 1980 Texas Instruments RC4558P vs current TI-RC4558P
I can't say I know for sure but probably not as far as the TI chips go. They should be electronically the same. The differences would be if there were a few more letters trailing on the end of the part number. EG RC4558Pxx
Is there a huge difference between old & new chips for overdrive type pedals ?
I can't say I know for sure but probably not as far as the TI chips go. They should be electronically the same. The differences would be if there were a few more letters trailing on the end of the part number. EG RC4558Pxx
L
Little Pigbacon
Guest
Re: 1980 Texas Instruments RC4558P vs current TI-RC4558P
The sight of a beat-up Tubescreamer with about half the paint missing gets my motor running.
The sight of a beat-up Tubescreamer with about half the paint missing gets my motor running.
PFDarkside
of the Forum
Re: 1980 Texas Instruments RC4558P vs current TI-RC4558P
Again, everything makes a difference. You’ll have to find one to see if you can hear it and if you prefer it. I’m not sure that I can.
Again, everything makes a difference. You’ll have to find one to see if you can hear it and if you prefer it. I’m not sure that I can.
devastone
Well-known member
Re: 1980 Texas Instruments RC4558P vs current TI-RC4558P
They function the same, otherwise they would have gotten a new number. I'm sure there are those out there that will say the old ones sound better (when did old different always become better than new different, anyway I digress), but I would bet no one would take a blindfold test on that. The problem with that would be that there would be way more difference from the tolerances on resistors and caps in 2 different pedals than chips with the same designation would make.
They function the same, otherwise they would have gotten a new number. I'm sure there are those out there that will say the old ones sound better (when did old different always become better than new different, anyway I digress), but I would bet no one would take a blindfold test on that. The problem with that would be that there would be way more difference from the tolerances on resistors and caps in 2 different pedals than chips with the same designation would make.
Edgecrusher
New member
Re: 1980 Texas Instruments RC4558P vs current TI-RC4558P
2 of the same side by side will be different. Small but different. I never worry about the chip, if its rc4558p its fine.
2 of the same side by side will be different. Small but different. I never worry about the chip, if its rc4558p its fine.
Edgecrusher
New member
Re: 1980 Texas Instruments RC4558P vs current TI-RC4558P
About 10 years ago I drove myself crazy doing blind listening tests, I could never identify one chip or another blindly with any accuracy greater than just guessing. We even tried a few with a friend of mine at the end of the day either swapping the chips or not and seeing if i could pick up on a change the next day. Never could get that one either. Side by side I can hear they arent the same but its not identifiable enough for me to pick it out with any reliability.
About 10 years ago I drove myself crazy doing blind listening tests, I could never identify one chip or another blindly with any accuracy greater than just guessing. We even tried a few with a friend of mine at the end of the day either swapping the chips or not and seeing if i could pick up on a change the next day. Never could get that one either. Side by side I can hear they arent the same but its not identifiable enough for me to pick it out with any reliability.
JMP/HBE
Well-known member
Re: 1980 Texas Instruments RC4558P vs current TI-RC4558P
Since yesterday ive spoken with Dave Friedman & Analogman Mike Piera and both said the same thing as above.
ErikH
Well-known member
Re: 1980 Texas Instruments RC4558P vs current TI-RC4558P
I could never tell a difference between the same chip model. Now, between different models like the 4558 and Brown Burr OAP2134 or TL072, I could hear a difference. The Brown Burr is actually a cool chip in a TS style overdrive.
I could never tell a difference between the same chip model. Now, between different models like the 4558 and Brown Burr OAP2134 or TL072, I could hear a difference. The Brown Burr is actually a cool chip in a TS style overdrive.
JMP/HBE
Well-known member
Re: 1980 Texas Instruments RC4558P vs current TI-RC4558P
So this pedal actually has 2 op amp chips stacked or piggybacked with the legs soldered.
I ordered some TI-RC4558P and one Brown Burr chip that im going to mix & match with.
Thanks for the tip.
*edit : just read a bad review of the brown burr chip, sez its rather bland, prolly wont use it. Bought a sleeve of 20 Raytheon RC4558NB op amps from the 70's i think. Should be good.
So this pedal actually has 2 op amp chips stacked or piggybacked with the legs soldered.
I ordered some TI-RC4558P and one Brown Burr chip that im going to mix & match with.
Thanks for the tip.
*edit : just read a bad review of the brown burr chip, sez its rather bland, prolly wont use it. Bought a sleeve of 20 Raytheon RC4558NB op amps from the 70's i think. Should be good.
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ErikH
Well-known member
Re: 1980 Texas Instruments RC4558P vs current TI-RC4558P
Hmm. I used the Burr Brown in a SD-1 mod I did years ago and liked it quite a lot. I wasn't stacking though. I tried that once but was like, eh, not for me. Modding is fun as long as you don't lift a solder pad.
So this pedal actually has 2 op amp chips stacked or piggybacked with the legs soldered.
I ordered some TI-RC4558P and one Brown Burr chip that im going to mix & match with.
Thanks for the tip.
*edit : just read a bad review of the brown burr chip, sez its rather bland, prolly wont use it. Bought a sleeve of 20 Raytheon RC4558NB op amps from the 70's i think. Should be good.
Hmm. I used the Burr Brown in a SD-1 mod I did years ago and liked it quite a lot. I wasn't stacking though. I tried that once but was like, eh, not for me. Modding is fun as long as you don't lift a solder pad.
GoldenVulture
Braindeadologist
Re: 1980 Texas Instruments RC4558P vs current TI-RC4558P
The Burr Brown chip is more "High Fidelity " in it's construction and used more in high end Audiophile gear. It not considered good when you want to produce " dirty " sounds. A cheap and nasty JRC4558P is often suggested better for " dirt " pedals.
The Burr Brown chip is more "High Fidelity " in it's construction and used more in high end Audiophile gear. It not considered good when you want to produce " dirty " sounds. A cheap and nasty JRC4558P is often suggested better for " dirt " pedals.
Chickenwings
Alnico 6/8
Re: 1980 Texas Instruments RC4558P vs current TI-RC4558P
It makes no difference at all once the band starts up.
It makes no difference at all once the band starts up.
Gtrjunior
New member
Re: 1980 Texas Instruments RC4558P vs current TI-RC4558P
Maybe not to the listener but it makes a difference to the player that would like to have a pleasing tone.
Maybe not to the listener but it makes a difference to the player that would like to have a pleasing tone.
Re: 1980 Texas Instruments RC4558P vs current TI-RC4558P
I get a decent tone out of almost anything. This borders on insanity.
I get a decent tone out of almost anything. This borders on insanity.
Gtrjunior
New member
1980 Texas Instruments RC4558P vs current TI-RC4558P
Not really much different than swapping preamp tubes.
Nobody but the player will ever notice but it hasn’t stopped all of us from doing it.
Not really much different than swapping preamp tubes.
Nobody but the player will ever notice but it hasn’t stopped all of us from doing it.
Re: 1980 Texas Instruments RC4558P vs current TI-RC4558P
Hey I can think of a million worse hobbies than tinkering with audio mods. I even remember a few of them!
Just remember, when it's about weird science it goes chips dips chains whips and Kelly Lebrock,,,, but chips always come first.
Hey I can think of a million worse hobbies than tinkering with audio mods. I even remember a few of them!
Just remember, when it's about weird science it goes chips dips chains whips and Kelly Lebrock,,,, but chips always come first.
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