JFet vs bipolar - Page 3

PMA · 24th November 2003, 06:22 PM

I have to support jewilson

. NE5532 measures well, but fails when influenced by D/A spikes from CD and RF interference, cannot manage it. He is right, every BB like 2134 etc. is better. And - 5532 has horribly high input bias current and current noise. So called advantage of low voltage noise can be utilized only for source output impedances and input resistors of some 100 Ohms.

Jocko Homo · 24th November 2003, 07:34 PM

Some of the stuff in this thread is ludicrous. But what do I know........30+ years of doing this has taught me nothing.

Jocko

Richard C · 24th November 2003, 09:27 PM

Nope, I've just checked and the original question wasn't "is the NE5532/4 any good?".

Op-amps make sense in low cost and pro equipment where there are constraints on cost, power consumption, board space, heat dissipation and where an impressive on-paper specification is important. But for us DIYers, at least as far as pre-amps are concerned none of the above is really an issue.

Connecting up an op-amp can hardly be described as 'designing a high-end pre-amp'.

peranders · 24th November 2003, 09:31 PM

Quote:

Originally posted by Asbjorn
Actually I believe jfets sounds alot more like triodes than bipolar too! But this smooth, soft and nice sound it delivers - is it correct or some kind of "coloration" that's being added to the original signal? I'm afraid it is!

But what do you think about jfets and bipolars? Especially sonic experiences have my attention.

Asbjørn, I think that you have to deside what you want to do and then go for it. JFET's, tubes, BJT's are all very good in good designs AND very bad in bad designs.

Maybe you can take some advice from Jocko if he want to give any. He knows something I believe.

peranders · 24th November 2003, 09:38 PM

Quote:

Originally posted by Asbjorn
Btw, I think ne5532 is better than those popular fet opamps from AD and BB. I think all the AD and BB opamps I've heard sounds bright and undynamic comparede to ne5532.

Really, you have heard OPA627 and AD8610 in their optimal environments? They are not bad, that's for sure.

My AD8610/BUF634 headphone amp is not boring.

Can be seen here

jewilson · 24th November 2003, 09:52 PM

OP27, OP37, OPA2604, OP249, OP275, LM6172/ AD825/26, AD797 AD8610, OPA627, OPA637, OP134, AD8610, AD8620. These are just a few of the part that sound better than the yesterday news 5532/4 parts.

An for most applications the FET sound better low odd harmonics.
I mean you don't see any bipolars on the front end of any of Nelson's, Curl work now why is that.

TimA · 24th November 2003, 10:24 PM

I am reminded of the story of the ''audiophile'' who returned home from a concert complaining that there was not enough ''presence''. The quest for clarity, detail and precision is fine up to a point, but every recording represents an imperfect replica of a real musical event and posesses imperfections that easily distract the listener from the music. As a musician I know how music sounds both on and off stage, the most cohesive sound is often to be found some way from the stage.

In my view FETs produce an unnatural spotlight on detail, rather like sitting in the front row. I find Bipolar devices convey a more balanced sound, not quite as detailed as the FET sound, though more realistic overall. In general I have found BJTs convey a more realistic sense of perspective. This brings us back to the NE5534 which incidentally is a dual version of the NE5533 according to the datasheet, not the NE5532. I don't pretend it is perfect, my discrete S.E. class A op-amp circuit sounds better to me, but the NE5534, especially when biased into class A, plays music with sufficient clarity, tonal neutrality and a believable perspective in a way that I have not experienced with many more modern IC op-amps.

Regarding the previously suggested (in this thread) visit to the doctor for a cure for the NE5534 ''thing'', doctors are very well educated people who enjoy good music and culture, the NE5534 might be to their liking!

Tim.

peranders · 24th November 2003, 10:35 PM

Quote:

Originally posted by jewilson
I mean you don't see any bipolars on the front end of any of Nelson's, Curl work now why is that.

This means only that they like them/prefer them in some way.

jewilson · 24th November 2003, 10:58 PM

Well If there were only 709's, 741, uA739, 540's, available in this world then I might think that a 5534 was some kind of marvel. Having said that, na I would use tubes.

Tim, sorry you can here the difference, but where did you do this research. You must have been in bad environment maybe faulty towers.

Jocko Homo · 24th November 2003, 11:03 PM

You forgot TL0x1s,and the like. And LM833s too, although some here seem to think that they are also good.

If they are so good, then why didn't the place that buys my pull-outs want them??

Answer: they couldn't sell them. About the only truly useless crap that I have pulled out in the last 20 years.

Jocko

24th November 2003, 07:34 PM	#22
Jocko Homo Banned Join Date: Feb 2002 Location: As far from the NOSsers as possible	Good grief, Charlie Brown........ Some of the stuff in this thread is ludicrous. But what do I know........30+ years of doing this has taught me nothing. Jocko

24th November 2003, 09:52 PM	#26
jewilson diyAudio Member Join Date: May 2002 Location: Plano , TX	Just a few part that out perform 5532/4 OP27, OP37, OPA2604, OP249, OP275, LM6172/ AD825/26, AD797 AD8610, OPA627, OPA637, OP134, AD8610, AD8620. These are just a few of the part that sound better than the yesterday news 5532/4 parts. An for most applications the FET sound better low odd harmonics. I mean you don't see any bipolars on the front end of any of Nelson's, Curl work now why is that. __________________ Jim W.

24th November 2003, 10:58 PM	#29
jewilson diyAudio Member Join Date: May 2002 Location: Plano , TX	Well many of us then perfer them in some way...... Well If there were only 709's, 741, uA739, 540's, available in this world then I might think that a 5534 was some kind of marvel. Having said that, na I would use tubes. Tim, sorry you can here the difference, but where did you do this research. You must have been in bad environment maybe faulty towers. __________________ Jim W.

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24th November 2003, 06:22 PM	#21
PMA diyAudio Member Join Date: Apr 2002 Location: Prague, Kitakyushu, Fukuoka	I have to support jewilson . NE5532 measures well, but fails when influenced by D/A spikes from CD and RF interference, cannot manage it. He is right, every BB like 2134 etc. is better. And - 5532 has horribly high input bias current and current noise. So called advantage of low voltage noise can be utilized only for source output impedances and input resistors of some 100 Ohms.

24th November 2003, 09:27 PM	#23
Richard C diyAudio Member Join Date: Jul 2003 Location: Nottingham, England	Nope, I've just checked and the original question wasn't "is the NE5532/4 any good?". Op-amps make sense in low cost and pro equipment where there are constraints on cost, power consumption, board space, heat dissipation and where an impressive on-paper specification is important. But for us DIYers, at least as far as pre-amps are concerned none of the above is really an issue. Connecting up an op-amp can hardly be described as 'designing a high-end pre-amp'.

24th November 2003, 10:24 PM	#27
TimA diyAudio Member Join Date: Nov 2002 Location: UK	I am reminded of the story of the ''audiophile'' who returned home from a concert complaining that there was not enough ''presence''. The quest for clarity, detail and precision is fine up to a point, but every recording represents an imperfect replica of a real musical event and posesses imperfections that easily distract the listener from the music. As a musician I know how music sounds both on and off stage, the most cohesive sound is often to be found some way from the stage. In my view FETs produce an unnatural spotlight on detail, rather like sitting in the front row. I find Bipolar devices convey a more balanced sound, not quite as detailed as the FET sound, though more realistic overall. In general I have found BJTs convey a more realistic sense of perspective. This brings us back to the NE5534 which incidentally is a dual version of the NE5533 according to the datasheet, not the NE5532. I don't pretend it is perfect, my discrete S.E. class A op-amp circuit sounds better to me, but the NE5534, especially when biased into class A, plays music with sufficient clarity, tonal neutrality and a believable perspective in a way that I have not experienced with many more modern IC op-amps. Regarding the previously suggested (in this thread) visit to the doctor for a cure for the NE5534 ''thing'', doctors are very well educated people who enjoy good music and culture, the NE5534 might be to their liking! Tim.

24th November 2003, 11:03 PM	#30
Jocko Homo Banned Join Date: Feb 2002 Location: As far from the NOSsers as possible	You forgot TL0x1s,and the like. And LM833s too, although some here seem to think that they are also good. If they are so good, then why didn't the place that buys my pull-outs want them?? Answer: they couldn't sell them. About the only truly useless crap that I have pulled out in the last 20 years. Jocko

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