4558 and TL072 question

jsteigs · 12th January 2005, 08:12 PM

Are the 4558 and TL072 interchangeable? I see a lot of people replace one with the other in their build reports but i just want to make sure.

Tube_Dude · 12th January 2005, 09:38 PM

Quote:

Originally posted by jsteigs
Are the 4558 and TL072 interchangeable? I see a lot of people replace one with the other in their build reports but i just want to make sure.

Yes!...they are interchangeable!

anatech · 13th January 2005, 12:27 AM

Hi jsteigs,
The TL072 is a J-fet input op amp. This will normally give you lower noise but may not be suitable in all circuits. In audio chains it is normal to install TL072's or better.
-Chris

udip · 13th January 2005, 01:19 AM

If your going to replace a 4558 that replace it with NE5532
and not a TL072...

udi.

anatech · 13th January 2005, 01:50 AM

Not always, sometimes TL072 is better, sometimes NE5532 is better. They are many other opamps that may better suit a particular circuit. Price can be factor as well.
-Chris

BrianL · 13th January 2005, 01:56 AM

Both TL072 and 4558 are considered sucky parts. Don't
waste your time, money or ears on them.

anatech · 13th January 2005, 02:08 AM

In a pure world, yes and maybe. NE5532 sounds okay. It strongly depends on what you are replacing the parts in. If it had 4558's, I doubt it rates spending $10.00 or more each on op amps when these maligned op amps (TL072, NE5532) would bring a large improvement.

You would be shocked to see what your audio signal goes through in a studio. Sometimes an NE5532 is the best thing in the chain. The most common interconnect is Beldin wire. Older consoles are chock full of old electrolytics (new if you are lucky) and older transistor designs. I'm thinking of old Neve and MCI boards. These are prized by some for their sound. Yes, tube and transistor outboard gear. Bucket brigade echo boxes, or if you're real lucky, an older tape loop job.

The newer boards like the SSL may be all digital. 'nough said. Then we compress it. Compression probably happened early on actually

Now, there are some that think op amps are a waste of time & money. Everyone has a point of reference, and the truth is often ugly.

-Chris

jsteigs · 13th January 2005, 09:04 AM

Quote:

Originally posted by anatech

Now, there are some that think op amps are a waste of time & money. Everyone has a point of reference, and the truth is often ugly.

-Chris

wow...very prophetic...

anyways, thanks for all the help every one. I know that these two opamps aren't so great, its just that i can get the 4558s very cheaply here in japan.

DigitalJunkie · 13th January 2005, 09:29 AM

I replaced the 4558's in my cheaper Sony 50+1 disc changer (CDP-CX50) with TL082's,figured it couldn't hurt.
I actually noticed a bit "tighter/faster" bass response,and the treble seemed a bit better too.At first,It seemed to affect the midrange in a strange way,or maybe it was just my ears/brain adjusting?
I wasn't sure if I liked it at first,but it seems okay,since the 82's are still in there.

I also added small bypass caps on all the filter caps for each rail,and added a couple Sanyo Os-Con's to bump up the capacitance a tad..sounds pretty good for a cheaper player....Still havn't removed the muting x-istors yet either..I plan to replace them with a small relay.

lumanauw · 13th January 2005, 01:24 PM

Does anyone knows what is the dual opamp (like NE5532) that uses folded cascode topology?

12th January 2005, 08:12 PM	#1
jsteigs diyAudio Member Join Date: Oct 2004	4558 and TL072 question Are the 4558 and TL072 interchangeable? I see a lot of people replace one with the other in their build reports but i just want to make sure.

13th January 2005, 01:56 AM	#6
BrianL diyAudio Member Join Date: Mar 2002 Location: USA	Both TL072 and 4558 are considered sucky parts. Don't waste your time, money or ears on them. __________________ bel

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13th January 2005, 12:27 AM	#3
anatech diyAudio Moderator Join Date: Jun 2004 Location: Georgetown, On	Hi jsteigs, The TL072 is a J-fet input op amp. This will normally give you lower noise but may not be suitable in all circuits. In audio chains it is normal to install TL072's or better. -Chris

13th January 2005, 01:19 AM	#4
udip diyAudio Member Join Date: Oct 2004 Location: Israel	If your going to replace a 4558 that replace it with NE5532 and not a TL072... udi.

13th January 2005, 01:50 AM	#5
anatech diyAudio Moderator Join Date: Jun 2004 Location: Georgetown, On	Not always, sometimes TL072 is better, sometimes NE5532 is better. They are many other opamps that may better suit a particular circuit. Price can be factor as well. -Chris

13th January 2005, 02:08 AM	#7
anatech diyAudio Moderator Join Date: Jun 2004 Location: Georgetown, On	In a pure world, yes and maybe. NE5532 sounds okay. It strongly depends on what you are replacing the parts in. If it had 4558's, I doubt it rates spending $10.00 or more each on op amps when these maligned op amps (TL072, NE5532) would bring a large improvement. You would be shocked to see what your audio signal goes through in a studio. Sometimes an NE5532 is the best thing in the chain. The most common interconnect is Beldin wire. Older consoles are chock full of old electrolytics (new if you are lucky) and older transistor designs. I'm thinking of old Neve and MCI boards. These are prized by some for their sound. Yes, tube and transistor outboard gear. Bucket brigade echo boxes, or if you're real lucky, an older tape loop job. The newer boards like the SSL may be all digital. 'nough said. Then we compress it. Compression probably happened early on actually Now, there are some that think op amps are a waste of time & money. Everyone has a point of reference, and the truth is often ugly. -Chris

13th January 2005, 09:29 AM	#9
DigitalJunkie diyAudio Member Join Date: Apr 2003 Location: Portland,Oregon	I replaced the 4558's in my cheaper Sony 50+1 disc changer (CDP-CX50) with TL082's,figured it couldn't hurt. I actually noticed a bit "tighter/faster" bass response,and the treble seemed a bit better too.At first,It seemed to affect the midrange in a strange way,or maybe it was just my ears/brain adjusting? I wasn't sure if I liked it at first,but it seems okay,since the 82's are still in there. I also added small bypass caps on all the filter caps for each rail,and added a couple Sanyo Os-Con's to bump up the capacitance a tad..sounds pretty good for a cheaper player....Still havn't removed the muting x-istors yet either..I plan to replace them with a small relay.

13th January 2005, 01:24 PM	#10
lumanauw diyAudio Moderator Emeritus Join Date: Oct 2002 Location: Bandung	Does anyone knows what is the dual opamp (like NE5532) that uses folded cascode topology?