NE5534A end of life announced

[SirPaulGerman]

Anything better than this
LM833N
LM393N

 

[Mark Johnson]

LM393N is not a dual opamp. Perhaps did you type an incorrect character or two?

 

[SirPaulGerman]

According to digi-key the

LM833N is a IC AUDIO 2 CIRCUIT 8DIP
LM393N is a IC COMPARATOR 2 GEN PUR 8DIP

 

[diyralf]

I see no reason to work with other op amps in the audio sector today. We have the NE5532 and LM4562. Why do you choose worse ones? If you have an existing circuit, then of course you replace the same chip.

 

[MarcelvdG]

I still don't understand why anyone would want to replace perfectly working ICs with essentially the same type. OK, an SA5534A is guaranteed to work below 0 degrees Celsius and has a slightly tighter noise specification, but if the noise isn't obtrusive now and if it doesn't freeze, what difference does that make?

 

[rsavas]

1) nothing better to do with ones time
2) make work project
3) ***** and giggles
Need anymore reasons along the same line?
As it is the ne5534a is not discontinued, totally. it’s just many of the flavours have been.

 

[mediatechnology]

Unisonic it appears will continue to make them: https://www.diyaudio.com/community/threads/unisonic-ne5534-une5534-and-ne5532.412174/#post-7670283

 

[mediatechnology]

https://www.diyaudio.com/community/threads/unisonic-ne5534-une5534-and-ne5532.412174/#post-7670283

 

[wahab]

Anything better than this
LM833N
LM393N

LM833 was a resounding failed attempt from NS to have something competitive with the NE5532, it is to be avoided
if you can get the 5532, theses are worlds apart.

 

[SirPaulGerman]

I wonder why they used those op amps in this preamp
2x 5532
4x TL072CP
6x LM833
1x LM393
It makes not sense

Very rare Rockford Fosgate RF200
no schematics or anything only a few reviews out there

​

 

[wahab]

TL072 could be because a high input impedance was required in some parts of the circuit, LM833
is surely for the lower cost than 5532s.

 

[WhiteDragon]

I noticed 8000
5534 in stock and 16,000 on the way.
Might panic a little.....nope

 

[diyralf]

I wonder why they used those op amps in this preamp
2x 5532
4x TL072CP
6x LM833
1x LM393
It makes not sense

Very rare Rockford Fosgate RF200
no schematics or anything only a few reviews out there

​

30 or 40 years ago people didn't have the measuring devices to determine the qualities of op amps. The few op amps that were available were used.

 

[Mark Johnson]

I wonder why they used those op amps in this preamp
2x 5532
4x TL072CP
6x LM833
1x LM393

Take a look at the LM393 datasheet ; it is a dual voltage comparator, a 1-bit Digital To Analog Converter. It is not an opamp. If you attempt to build linear analog amplification circuits with the LM393, you will encounter instability (oscillation) because the chip does not include frequency compensation. Voltage comparators never do.

Rockford Fosgate's designer felt that some aspect of the design required a voltage comparator (not an opamp), and chose the LM393 for that position.

 

[bucks bunny]

30 or 40 years ago people didn't have the measuring devices to determine the qualities of op amps. The few op amps that were available were used.

I disagree with that general statement. There existed different types of op-amps for different tasks - not one size that fits all.
How can the TO assume that the different stages inside the circuit all use the same amp?
Without the context, it is impossible to judge the choice of op-amps

 

[wahab]

At the time NS themselves stated that the LM833 could replace a NE5532, so it was meant as a cheaper replacement,
wich it didnt manage to actually achieve, remember that circa 1978 you couldnt manufacture a 5532 without
paying royalties to Phillips.

 

[SirPaulGerman]

If a replace the Lm833 with 5532 no problem with oscillating?
Both op amp have the same power requirements?

 

[wahab]

If it work no need to fix it, in principle there will be no audible difference, so why bother with the hassle.

 

[davidsrsb]

Looking at the TI LM833 datasheet, the CMRR is pretty poor at 10 KHz, so avoid non-inverting

 

[abraxalito]

30 or 40 years ago people didn't have the measuring devices to determine the qualities of op amps.

Audio Precision System 1 was on sale during that period which easily showed the noise difference between NE5532 and TL072.