Replace output opamp NE5532

[wandelblu]

Hi

I'm looking for a smooth sound, more sweet and musical fell like tubly sound.

Could you suggest me another opamp?


Regards, Enzo.

[Mooly]

OPA2604 Give it a try, I have used to very good effect to replace NE5534 in my Micromega Stage 2 (Used a OPA604 of course). I believe the distortion spectrum has even harmonics as predominating, which is more pleasing to the ear. I know some swear by some of the latest op-amps on the market but I would urge you to try these first.
Regards Karl

[Keruskerfuerst]

Analog Devices:

http://www.analog.com/dynamic/parame...Line=OPA&la=en

Burr Brown:

OPA2134PA

I think, you can find a matching OP from Texas Instruments.

[ar1617]

u can try LM4562, I find much better than 2604 which sounds veiled to my ears, YMMV tho...

[helios999]

beware
ne5532 +-22v max
lm4562 +-18v

[paulebappie]

LM4562 does magic

[hobbitz]

LME49860 +- 22V max

[kptseng]

Hi All,

Are the OPA2604 and LM4562 dual Op Amps?

I know there are tweaks putting a small ceremic cap across pin 4 & 8, and also putting resistors across pin 1 & 4, and 4 & 7 to have a class A bias.

Do these 2 tweaks work for OPA2604 and LM4562?

I am thinking of modding my newly acquired Micromega Stage2 (used).

[Mooly]

Hi, I too have MM Stage 2 and can recommend following. Replace the four NE5534 Op-Amps as follows. For the output buffers, they are the ones nearest the output sockets use AD845JN, for the I/V convertors use OPA604AP. You will find the I/C,s VERY difficult to remove due to the plated through vias, and I would recommend using very small sharp snips to cut each I/C out (cut as close to the package as possible), then use braid to clear holes which is also made easier if you use a thin piece of stainless wire to help clear the hole. I also cut the print to each output (the track that goes to pin 6 of the buffers) and bridged this with a 68 ohm surface mount resistor. This ensures total stability with any capacitive load. You probably would not need to do this though. The small multiturn trimmer next to each buffer is used to null any D.C. offset and you need a meter on its most sensitive D.C. voltage range to adjust. Set for ZERO volts on outputs NO disc playing. You will not be disappointed. There are other mods but these have the greatest gain in my opinion.
Please let us know how you get on,
Regards Karl
Edit The Op-Amps you mention are dual. Micromega uses single.
You may feel happier using socket,s if so recommend neatly soldering small bypass cap directly across pins 4 and 7 of the I/C - observe polarity if electrolytic.

[peranders]

AD8620 is also rather nice but max +- 13 V!