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Jag tänkte byta OP-ampar i ett LAB-gruppen filter.

Dessa kretsar sitter det i orginal: LF353N, NE5532N, SSM2139P, UA741CP

Någon som har förlag på moderna alternativ? Vad är viktigt att kolla på ersättningskretsar?

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The NE5532 is an old design but it is still one of the very best audio opamps (for the reasons outlined above

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Är de single eller dual?

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Yes, the LF353 is a fet input dual opamp like the OPA2604. Its should be a straight swap. It should also be a significant improvement. My personal recommendation would be for an OPA2107AP which IMO is a significant step up from the OPA2604AP, available from States based sellers on EBay.

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My favourite was always the AD823, closely followed by the AD712....... then again, the 2111 sounds valve like with undercurrents of guava floating on a honey base, the 2107 very nice with a hint of nettles dancing on a bed of strawberries with a strong sense of tarmac underpinning the bass, the 2227 could be described as "organic" you can really smell the soil with this op amp and can taste the earth....... 2132 is analytical though the infusion of camomile and aloe vera tame its microscopic view on the proceedings , 2604 warm ,moist and seductive, 2132 integrated, 2134 honky, 2228 organic though slightly GM Modified, LF353 harsh yet smooth, NE5532 a slight hint of water melon, AD OP271 mellow with a hint of raspberry ........... F*** will somebody please hit me over the head with a hammer!!!!

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1 Output A
2 Inverting input A
3 Non-inverting input A
4 V-
5 Non-inverting input B
6 Inverting input B
7 Output B
8 V+

Supply Voltage ±18V

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I think the OPA2134 is a better sounding dual opamp than the OPA2604

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You could always try the LM4562 (or the single version LME49710). The LM4562 is miles ahead of the OPA2604 in terms of sound quality, if bypassed properly with an MKT cap.

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Själv bytte jag från NE5532(om det är dual varianten) till LM4562 med mkt bra resultat. Sen har du OPA627 både som single och som dual på adapter.

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With horrible inevitability, the very popularity and excellent technical performance of the 5532 has led to it being criticized by subjectivists who have contrived to convince themselves that they can tell op-amps apart by listening to music played through them. This always makes me laugh, because there is probably no music on the planet that has not passed through a hundred or more 5532s on its way to the consumer.

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By a person who knows a person at National in Sweden,I got to know that it is the same chip.
By the same reason you mention(marketing strategi)they have changed the name.
So then there are 3 opams that are the same now,but with diffrent names.Lm4562,LME49720 and LME79860...

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Tog med citatet för det var kul. Snubben gillar ju att räkna på kretsar... Å så gillar han LM4562, så ni har ju kommit fram till samma sak fast från olika håll.

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To answer the questions though the LME49713 CFB is a slightly better sounding part than the LME49710 VFB but they are both better than any other opamp on the market at this time. The THD+N spec of 0.00005% or so is REAL! But the process the parts were built on and the engineer who designed them is what sets them apart. (I specified the LME49713) These will be the reference opamps for audio for many years to come...

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Ja så kan det vara, men det visar ju att det man hör ibland även har en teknisk förklaring

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I have this in my AD databook from 1992. It is stable for gains greater than or equal to 3. Slew rate is 11V/uS with a voltage noise of 3.2nV/#8730;Hz (5nV @ 1KHz max). I was hoping I had a PDF file for you.

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Efter att ha läst en massa mumbo-jumbo om opampar på nätet hittade jag denna artikelserie som är väl värd att läsa:

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Jag har goda erfarenheter av "Linear Technology 1361", rekomenderas

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