Electronics > Projects, Designs, and Technical Stuff
OK audio gurus: What are the highly regarded FET-input op amps these days?
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David Hess:

--- Quote from: Marco on December 11, 2018, 03:49:57 pm ---A great improvement towards what exactly? When even the venerable AES needs to do something extremely silly like making the circuit amplify the distortion by 80 dB to do a listening test you can easily see HiFi kinda lost the plot.
--- End quote ---

Study the datasheets and find out.  The OP627 has lower distortion, lower noise, and higher common mode rejection then the jelly bean parts it can replace.

There are some really improved JFET parts for audio applications but I limited myself to suitable replacements for the LF411 and LF412 and parts discussed elsewhere.  The LT1113 and LT1169 come to mind.

As a practical matter, I would stick with the cheap TL07x/TL08x series unless lower noise or lower distortion in a non-inverting configuration is required and instead use better circuit topologies including unloading the output of the operational amplifier.

Linear Technology had a great discussion about non-linear input capacitance in JFET operational amplifiers causing distortion in non-inverting configurations but Analog Devices has apparently deleted it.
Audioguru:

--- Quote from: Mechatrommer on December 08, 2018, 05:54:51 am ---i cant hear 1MHz anyway..

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The audiophools in the double blind listening tests might be old like me (73) with normal for their age high frequency hearing loss. Then they cannot hear missing high frequencies and cannot hear distortion and hiss anyway.

Old geezers without hearing aids cannot hear the distortion and hiss of a lousy old 4558 dual opamp. The datasheet does not say a single word about how much distortion it has and lists "typical" noise but lists no maximum amount of noise like audio opamps do.

My hearing aids boost the highs to normal without any distortion or hiss. In a noisy mall, street or restaurant their automatic noise reduction mode works very well. 
Mechatrommer:
i'm not entirely sure what you mean, good or bad. anyway what took you so long? the OP was calling for you (look at the topic!)
cvanc:

--- Quote from: Mechatrommer on December 11, 2018, 10:06:54 pm ---... anyway what took you so long? the OP was calling for you (look at the topic!)
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 :-DD :-DD :-DD
Marco:

--- Quote from: David Hess on December 11, 2018, 09:09:59 pm ---The OP627 has lower distortion, lower noise, and higher common mode rejection then the jelly bean parts it can replace.

--- End quote ---

Do you think there is anyone in the world who could even hear the difference compared to an OPA140 in an A/B test for a realistic circuit? (ie. not the silly AES one.) Let alone a quality test.
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