Hi,
a picture first:
this is my old 8000 Ultracurve. I have AES/EBU installed and feed it with spdif.
On the output one hot pin is connected to ground to make it asymmetric.
My questions:
I can not see any OPs, where are they ?
These 14pinICs labeld "Behringer" ?
For shure there are lots of magnetic resistors and cheap caps in the signal path, especially the SMD resistors would be difficult to change, so:
Is there any DIY DAC that can be used with the AES output ?
If I use an external dac, is there any reason to upgrade to 8024, sonically ?
Any rumors about a new model coming ???
Could I built some HQ output circuit direct to the pins of that DAC ?
Thanks, Bernhard
a picture first:
this is my old 8000 Ultracurve. I have AES/EBU installed and feed it with spdif.
On the output one hot pin is connected to ground to make it asymmetric.
My questions:
I can not see any OPs, where are they ?
These 14pinICs labeld "Behringer" ?
For shure there are lots of magnetic resistors and cheap caps in the signal path, especially the SMD resistors would be difficult to change, so:
Is there any DIY DAC that can be used with the AES output ?
If I use an external dac, is there any reason to upgrade to 8024, sonically ?
Any rumors about a new model coming ???
Could I built some HQ output circuit direct to the pins of that DAC ?
Thanks, Bernhard
The opamps are the vertical in line units marked 4580.
In my opinion you should ait for the 24/96 replacement. The 8024 is very cheap and very cheerful and despite claims in this forum requires major surgery to make it sound reasonable.
Problem seems to be in the transformer, dc power supply, clock and many cheap electrolytics. If you have lots of time and patience, may be you can improve it. It will be a major undertaking to change the opamps.
The measured performance of the unit with analog in is not good - from memory thd+n was about -70dB on the 8024.
In my opinion you should ait for the 24/96 replacement. The 8024 is very cheap and very cheerful and despite claims in this forum requires major surgery to make it sound reasonable.
Problem seems to be in the transformer, dc power supply, clock and many cheap electrolytics. If you have lots of time and patience, may be you can improve it. It will be a major undertaking to change the opamps.
The measured performance of the unit with analog in is not good - from memory thd+n was about -70dB on the 8024.
Ok, this 4558 is the output stage, but where is it made symmetrical again ?
How about that ?:
Pull out the whole output stage, swap the OP for a socket, desolder all resistors and caps of the filter network, and then put bridges where necessary, so that I have the l+, l-, r+, r- on the socket.
Build a board with a new output stage and plug it into the socket.
Ground comes from the PSU.
How about that ?:
Pull out the whole output stage, swap the OP for a socket, desolder all resistors and caps of the filter network, and then put bridges where necessary, so that I have the l+, l-, r+, r- on the socket.
Build a board with a new output stage and plug it into the socket.
Ground comes from the PSU.
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