TL074 vers. TL084 ?

lohk · 18th January 2003, 01:39 PM

Is there a disadvantage to use a TL084 instead of a TL074 ?
What is the difference of those opamps anyway, soundwise ?
(Yes, I know there are better ones, but still...)

Klaus

peranders · 18th January 2003, 01:57 PM

This was like the swedish game "Finn Fem Fel" (Find five errors). I can't see any difference in the datasheets. Am I blind?

Quote:

The JFET-input operational amplifiers in the TL07_ series are designed as low-noise versions of the TL08_

But the figures are the same....

dhaen · 18th January 2003, 01:58 PM

Hi Klaus,

There's always better, but:

The '74 has lower noise figure, so is better for AC signals.
The '84 has lower offset, so is better for DC signals

Cheers,

lohk · 18th January 2003, 02:14 PM

I was looking at the data specs for quite a time and did not find something significant:

So many thanks for the answers. Lower offset vers. higher noise !
I will have to look again...

Any experience soundwise ?
It seems not so important, because the successors are kind of better, but those chips are really cheap, and I just happen to have a lot...

Klaus

dhaen · 18th January 2003, 04:09 PM

Klaus,

IMO the '72 & 74 don't sound too bad, considering the cost.
But please don't tell them in the Tube Forum that I said so!

Cheers,

peranders · 18th January 2003, 08:16 PM

Quote:

Originally posted by lohk
I was looking at the data specs for quite a time and did not find something significant:

So many thanks for the answers. Lower offset vers. higher noise !
I will have to look again...

Any experience soundwise ?
It seems not so important, because the successors are kind of better, but those chips are really cheap, and I just happen to have a lot...

If you have them and want to use them I can say that they aren't like µA741. They are like a Volvo 740 GLT in excellent condition. Safe car, OK to drive but not very exciting. Volvo S80 with extra stuff is cooler....

BTW: I have also a bunch of TL0x (plastic and ceramics) for sale....

dhaen · 18th January 2003, 08:20 PM

Hi Per-anders,

Do you have '74 or '84's?
If you have 50 - 500, please e-mail me.

Cheers,

Edu Silva · 18th January 2003, 11:02 PM

Hi, all

They are basically the same thing.

The chips come from the same silicon waffer, and selected for lowest noise: the better ones are labeled TL074 (or 72); the others will be TL084 (or 82).

Edu Silva
ES2 Audio

dhaen · 18th January 2003, 11:50 PM

Quote:

the better ones are labeled TL074 (or 72); the others will be TL084 (or 82).

The "better" ones depends on what you want them for.
'84's are not the unselected ones. They too may be selected
for minimal DC offset.
The opamps that fail both tests probably get remarked and sold to audiophiles.

Edu Silva · 19th January 2003, 12:25 AM

Quote:

Originally posted by dhaen

The "better" ones depends on what you want them for.

For lowest noise, as I said.

More interesting for audio than low DC offset.

(and they aren't good choice for DC servos, anyway...).

18th January 2003, 01:39 PM	#1
lohk diyAudio Member Join Date: Apr 2001 Location: Austria, near Linz	TL074 vers. TL084 ? Is there a disadvantage to use a TL084 instead of a TL074 ? What is the difference of those opamps anyway, soundwise ? (Yes, I know there are better ones, but still...) Klaus

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18th January 2003, 01:58 PM	#3
dhaen diyAudio Moderator Emeritus Join Date: Jun 2002 Location: U.K.	Hi Klaus, There's always better, but: The '74 has lower noise figure, so is better for AC signals. The '84 has lower offset, so is better for DC signals Cheers,

18th January 2003, 02:14 PM	#4
lohk diyAudio Member Join Date: Apr 2001 Location: Austria, near Linz	I was looking at the data specs for quite a time and did not find something significant: So many thanks for the answers. Lower offset vers. higher noise ! I will have to look again... Any experience soundwise ? It seems not so important, because the successors are kind of better, but those chips are really cheap, and I just happen to have a lot... Klaus

18th January 2003, 04:09 PM	#5
dhaen diyAudio Moderator Emeritus Join Date: Jun 2002 Location: U.K.	Klaus, IMO the '72 & 74 don't sound too bad, considering the cost. But please don't tell them in the Tube Forum that I said so! Cheers,

18th January 2003, 08:20 PM	#7
dhaen diyAudio Moderator Emeritus Join Date: Jun 2002 Location: U.K.	Hi Per-anders, Do you have '74 or '84's? If you have 50 - 500, please e-mail me. Cheers,

18th January 2003, 11:02 PM	#8
Edu Silva diyAudio Member Join Date: Jan 2003 Location: Brazil	Hi, all They are basically the same thing. The chips come from the same silicon waffer, and selected for lowest noise: the better ones are labeled TL074 (or 72); the others will be TL084 (or 82). Edu Silva ES2 Audio

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