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Old 27th January 2013, 01:14 PM   #19011
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Default modding CD63SE

I have just completed most of the modding work for my friend's CD63SE
The next thing I will do is to change the clocks for the servo and the DAC by Ray's 2 fleas that I bought from him some time ago.
Eventhough without changing the clocks at the moment the SQ from this player is already very very GOOD
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Old 27th January 2013, 06:48 PM   #19012
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Nice work, higlander! I wish mine was that neat.

What 12v regs are you using? They look nice and small.

I've got to start thinking about taking another look at my DOS at some point.
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Last edited by Ben Hanke; 27th January 2013 at 07:12 PM.
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Old 27th January 2013, 09:00 PM   #19013
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Originally Posted by Ben Hanke View Post
Nice work, higlander! I wish mine was that neat.

What 12v regs are you using? They look nice and small.

I've got to start thinking about taking another look at my DOS at some point.
Hi Ben|: I used +15 and -15V regulators instead of 12V as most opamps run better at 15V.
The regulators are from Korea with quite good specifications:
ULN-HC78A Ultra Low Noise Positive Regulator 2.5V~30V Output High Current Type | eBay
IMHO they are value for the money regulators and can perform very well.

For the discrete opamps I used Burson as they occupy less space.
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Old 28th January 2013, 03:02 AM   #19014
Pocoyo is offline Pocoyo  Indonesia
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Quote:
Originally Posted by higlander View Post
I have just completed most of the modding work for my friend's CD63SE
The next thing I will do is to change the clocks for the servo and the DAC by Ray's 2 fleas that I bought from him some time ago.
Eventhough without changing the clocks at the moment the SQ from this player is already very very GOOD
hi highlander

i want to ask about your output opamp

- do you still use this schema for output opamp ?
- where do you solder the output, direct to RCA out ?
- or goes before resistor ?
- Can you give me detailed picture ?

Best regards
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Old 28th January 2013, 05:19 AM   #19015
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Originally Posted by Pocoyo View Post
hi highlander

i want to ask about your output opamp

- do you still use this schema for output opamp ?
- where do you solder the output, direct to RCA out ?
- or goes before resistor ?
- Can you give me detailed picture ?

Best regards
No, I did not try it. With the dual opamps the output to RCA is via a 3.3uF blocking cap and then with a 47R in series.
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Old 28th January 2013, 07:36 AM   #19016
UV101 is offline UV101  England
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Quote:
Originally Posted by Pocoyo View Post
hi highlander

i want to ask about your output opamp

- do you still use this schema for output opamp ?
- where do you solder the output, direct to RCA out ?
- or goes before resistor ?
- Can you give me detailed picture ?

Best regards
There is a problem with the circuit you have posted. The output will be inverted which is one of the reasons for using the 2nd Opamp.

Do as you have done here but take the output from after the 2nd Opamp. The DC value should be almost at this output (but check with a meter on mV scale). Anything less than about 25mV and you don't need the DC blocking cap. The best cap is no cap

I think you've already bypassed the HDAM and muting from what I've seen in a previous post.
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Old 28th January 2013, 08:15 AM   #19017
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Originally Posted by higlander View Post
For the discrete opamps I used Burson as they occupy less space.
Hi Ben: A friend of mine has also tried the following discrete opamps and actually the SQ is very similar to Burson but costs much less

http://www.audio-gd.com/Pro/diy/OPA/OPAEN.htm

I was told the seller uses UPS and the shipment is quick.

Last edited by higlander; 28th January 2013 at 08:20 AM.
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Old 29th January 2013, 08:19 AM   #19018
UV101 is offline UV101  England
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I'm sure there are a few details floating around the web about the OPAsun being a copy of the Burson or vice versa??
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Old 29th January 2013, 11:08 AM   #19019
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Originally Posted by UV101 View Post
I'm sure there are a few details floating around the web about the OPAsun being a copy of the Burson or vice versa??
OH, I am not aware of that and that might explain why the two products sound so similar
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Old 30th January 2013, 03:18 AM   #19020
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Thanks higlander. TBH don't really fancy the idea of discrete op-amps much. I'll be sticking with my LM4562HA until I can finish my DOS.
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