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Old 21st June 2013, 02:24 PM   #19531
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Oh yeah, also, established wisdom is that the DOS needs high quality regulators and big VA PSUs to sound its best. I just have four 7X12 regs fed by my existing supply (30VA?) with 22,000uF smoothers. Even as it is, it's definitely better on balance, both in terms of detail and musical enjoyment. I haven't had the hairs stand up on the back of my neck yet though.
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Old 21st June 2013, 02:34 PM   #19532
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One thing you can do if you have itchy fingers, Alan, is build one anyway and try it. It's possible to hook it up without removing the old output stage.
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Old 22nd June 2013, 08:40 AM   #19533
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Pics showing Discrete Opamps.
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File Type: jpg P1010734.jpg (685.8 KB, 93 views)
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Old 22nd June 2013, 05:09 PM   #19534
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Cool pics! Those are two impressive looking players. One thing that jumps out to me about the discrete op-amp solution is that it looks like it must involve almost four times the component count of the DOS.
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Old 22nd June 2013, 05:33 PM   #19535
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Originally Posted by Ben Hanke View Post
Cool pics! Those are two impressive looking players. One thing that jumps out to me about the discrete op-amp solution is that it looks like it must involve almost four times the component count of the DOS.
I found discrete Opamps sound better than metal CAN 49720HA but they need to have very low noise and stable voltage regulators to bring out their wonderful performances. I use +/- 15V to drive them.
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Old 22nd June 2013, 08:46 PM   #19536
Bartt is offline Bartt  Netherlands
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Hi guys, my player is going wild and I can't seem to find the problem. When I switch it on the disk is spinning very fast and the sledge is going crazy. The display doesn't light up. Any idea's what it could be?

Before this I replaced c813 and c814 with a Pan FC 4700-25v so I can put in de new Tx later. Maybe something went wrong when I switch them.

tnks!

regards,
Bart
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Old 22nd June 2013, 09:14 PM   #19537
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Default re discrete

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Originally Posted by higlander View Post
I found discrete Opamps sound better than metal CAN 49720HA but they need to have very low noise and stable voltage regulators to bring out their wonderful performances. I use +/- 15V to drive them.
Are they burson discrete stage .?
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Old 23rd June 2013, 12:56 AM   #19538
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Bart, check your voltages. Is the main 5v reg working?
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Old 23rd June 2013, 07:47 AM   #19539
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Are they burson discrete stage .?
Yeah and they sound very analogue and smooth. I love them

Last edited by higlander; 23rd June 2013 at 07:51 AM.
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Old 23rd June 2013, 07:55 AM   #19540
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Originally Posted by Bartt View Post
Hi guys, my player is going wild and I can't seem to find the problem. When I switch it on the disk is spinning very fast and the sledge is going crazy. The display doesn't light up. Any idea's what it could be?

Before this I replaced c813 and c814 with a Pan FC 4700-25v so I can put in de new Tx later. Maybe something went wrong when I switch them.

tnks!

regards,
Bart
Check if the +/- of Caps C813 and 814 are correctly fitted. It seems you have lost the 5V supply to the circuits.
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