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Old 17th November 2008, 02:26 PM   #21
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Angry misinformation

Quote:
Originally posted by lineup
until we can come up with a better overall measurement
we will have to stick with THD
if it was that really bad, then we would have replaced it many years ago

THD does not give the exact level of all forms of distortion
but you can bet,
if THD is low,
then this indicates a good performance and a good circuit
and most other distortions will be at low level

if THD is high, there is a great probability other distortions can be high
and even if not, it is already bad having a high THD

:bs:
The Crown IC150 preamp I owned long time ago had incredible low harmonic distortion yet sounded terrible dull, tired, lacklustre!
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Old 17th November 2008, 04:00 PM   #22
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Default Discrete

I like the discrete ones.

I have a NAD C542 that I tweaked a "little" with better PS caps, schottky diodes, MKP coupling capacitors, DIP sockets, clock upgrade...

The opamps that I used were the LM4562, yesterday I've changed them to a discrete output stage from audio-gd:
http://www.audio-gd.com/enweb/pro/diy/OPA.htm
After some listening I definitely prefer those discrete stages, it just sounds better.
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Old 17th November 2008, 10:24 PM   #23
PALUSE is offline PALUSE  Portugal
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What about the LMs! What have it wrong?!
Did you replace the 220 Ohms resistors (R390 to R393) in series with the +/- power line of the opamps with good quality coils! Well, for that dimension is a compromise, but it worth the effort!

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Old 18th November 2008, 11:09 AM   #24
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I liked the LM4562 better than the original OPA2134, but the discrete output stage sounds the best to me.

No, I didn't use coils in the PS for the output stage, in my NAD C542 the power supply is regulated with LM317/LM337.
I did change to better caps (Pana FC, Rubycon ZL, MKP1837 bypass)
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Old 18th November 2008, 06:09 PM   #25
hafp is offline hafp  United States
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Try giving either of these a listen:
OPA2107
AD8599

They are both dual channel opamps; the OPA2107 comes in both DIP and SOIC, but the AD8599 is only available in SOIC-8, so you will need a browndog adapter if you want to use it in a DIP socket.

IMO, these sound better than the JRC5532, and will not break the bank to try a pair of these.

Good Luck.
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Old 18th November 2008, 09:42 PM   #26
PALUSE is offline PALUSE  Portugal
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Ok Danny, the NAD use LM regulators for +/- 12V, but the circuit have in serie 4 resistors in the power path to the opamps, after the LMs. The coils only will give a little current reserve and better HF filtering for the noise in the +/- 12V supply lines. I put coils in my C541 and listen some diferences, the sound get more smooth!In this case the higer inductance and lower resistance will give better power supply!The original resistors are about 200 Ohms, if i remember right! You should not have problems to get 4 coils with good inductance values and lower resistance than 200 ohms!
I bought recently mini coils with 1 mH (m not u) and 12 Ohms!
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Old 19th November 2008, 09:53 AM   #27
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Hello Paluse,
I have the NAD C542 and the power supply is different than your C541, in the C542 there are no resistors between the LMs and the opamps. But it will be no problem to add some chokes just before the caps near the opamps. The only problem will be space: I already have MKP coupling caps, an external clock with its proper PS, the discrete output stage. What's the size of those chokes and where did you buy them?
Regards,
Danny
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Old 20th November 2008, 01:03 AM   #28
PALUSE is offline PALUSE  Portugal
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Are you sure danny?!
The resistors dont appear on the schematic, but appear in the pcb layout! Just check if it exist in you C542!
By the way, the psu of the C541 only differs because it dont have standby mode, and some of the electrolitic caps and the diodes D501 to D504 are different parts!


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Old 5th December 2009, 01:24 PM   #29
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Default NE5532's

hallo all,
can I please try and make the quiet comment, that there is a great variety of NE's? Originally conceived by Signetics in 1974? I think it was covered by one or more patents, so it gave Philips a definite edge when they took over Signetics sometime in the late 70'ties - early eighties. If I have not got this much wrong, then the patent(s) at some stage stopped being exclusive, so quite a number of other manufactures started producing 'clone' varieties of the original design. One of these is the JRC variety - others are TI-BB, Fairchild etc. etc. JRC or NJR (New Japan Radio and probably same wafer plant, at some point even tried to better the original design with an even lower noise 2114 version. But ladies and Gents the original Signetics variety (I think it even started with the 1024 number???), is still quite a competent beast...
If You have the opportunity - then please don't miss a chance to give it a good test?
One of the novelties about the construction is the output stage composed with Bipolar NPN's only. It's a quite remarkable construction, in as much as stil being very competitive (and very much used due to these days exelent price/value relationship) in overall performance even now 35 +years later. I believe Mr. Douglas Self is one of it's very devoted users/followers. I myself (said the big Danish dog), purchased my 1st ones back sometime in I think 1982 and the price was horrendous - something like £2.50 making equivalent 2day say ~ £20? And back then it was just so superior to anything else available - 741 & 357 ring a bell?
All the best
a1greatdane
London N4

Last edited by a1greatdane; 5th December 2009 at 01:28 PM. Reason: spelling error & db. words
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Old 5th December 2009, 01:45 PM   #30
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Quote:
Originally Posted by wandelblu View Post
Hi, I'd like to change my output opamp in my cd-player?

Actually I've been using the NE5532 but I'd like to try some other.

Could you gimme some advices?

I've just take a look on LM4562 or OPA2134... what about them?


Friendly, Enzo.
Try the LME49725, LME49723, LME49720HA. My favorite National's. They're more musical than the LM4562.

Otherwise, the AD8599 is said to be a good substitute for the NE5532.
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