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Old 13th December 2004, 11:59 AM   #11
klitgt is offline klitgt  Denmark
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Quote:
Originally posted by jean-paul
Replacing the C4570 will be worth the trouble. They sound awful compared to even NE5532. Last time I saw them in a DCD2700 I replaced them for OPA2604 which was a big improvement.

I want to do something to a Denon DCD3560 which is a great transport but with some low-end opamps in the analog part.
I have attached a simplified schematic diagram for reference.
The DAC chips are BB PCM58K followed by uPC4570C opamps for I/V conversion, NE5532 for low pass filtering and NE5534 for output buffering.

I have read in some Danish forums that the uPC4570C should definitely be replaced by NE5532 and NOT by ANY jet based opamps. Maybe those people are religious about bipolar opamps since they hate fets so much!?

The OPA2604 datasheet mentions among the applications "PCM DAC I/V conversion". And you have used and recommended the OPA2604!

I am confused about these apparent contradictions.
Any ideas to replacements of the 4570, 5532 and 5534s?
Thank's in advance :-)
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Old 13th December 2004, 08:14 PM   #12
klitgt is offline klitgt  Denmark
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Quote:
Originally posted by jean-paul
Replacing the C4570 will be worth the trouble. They sound awful compared to even NE5532. Last time I saw them in a DCD2700 I replaced them for OPA2604 which was a big improvement.

Sorry if this appears more than once, but something seems to have gone wrong for my PC.

Do you Jean-Paul mean that OPA2604 is better than NE5532 as I/V converter? I have seen in another forum that NE5532 gives a lot of slam in the bass while OPA2604 gives a more sweet and liquid sound with less slam in the bass as I/V converters. Do you agree?
I have even seen that OPA627 as I/V converters are for those who want a direct and "right into the face" CD sound that discloses the difference between CD and vinyl?

What about OPA2604 as I/V converters and OPA627 as buffers?
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