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Old 5th November 2003, 05:28 PM   #1
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Default AudioCom Superclock for Sale

Hello,

I have for sale (1) AudioCom Superclock, it is version 1. The frequency is 16.9344MHZ.

It has been installed in my CD player for about a month.

I would like to get $125.00 USD for the clock.

Please e-mail or post with any questions.

Thanks
KevinLee
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Old 7th November 2003, 12:19 AM   #2
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Hello,

I would be willing to trade the clock for better quality RCA plugs, Banana Plugs or Posts.

Please let me know what you have.

Thanks

KevinLee
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Old 7th November 2003, 02:47 AM   #3
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Why are you getting rid of it?
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“Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC
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Old 7th November 2003, 04:04 AM   #4
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Hello Peter,

I have done extensive mods to my CD63, they are as follows:

-removed muting transistors
-removed dc blocking caps on output
-op-amps changed to AD8620 via Brown Dog Adapters
-All small caps near op-amps changed to silver mica.
-All ICs shielded with aluminum & copper tape & connected to ground plane
-soft recovery diodes for bridges
-Os-Con or Cerafine throughout
-Larger filter caps after bridge (Elna for Audio models)
-unhooked headphone stage
-de-coupled op-amps + & - pins to ground with .1uf ceramic & 1uf Os-Con
-installed about 3 pounds of sound dampening material to panels & transport
-installed Corcom medical grade RF/EMI filter
-de-coupled all ICs to ground with ceramic cap

-I have modified the circuit near the DAC as per acoustica.org (moved some caps around & cut some traces).

I installed the clock with as short as possible connections.

The upper frequency is now terrible, very hard to listen to.

I built an enclosure for the clock and shielded it with copper & aluminum & grounded it.

I do not know what to try know. Maybe I have to measure the output for DC and maybe I have to re-install the DC blocking caps.

I was wanting to sell the clock, as for me, the CD player sounds better without it.

I really hate to abandon this player, I was hoping the clock would take it to the next level and become a good cd player.

Any input or ideas from any of the members would be appreciated.

Best Regards

KevinLee
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Old 7th November 2003, 04:54 AM   #5
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Elso is a resident clock specialist. Maybe he could advise something?
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Old 7th November 2003, 10:12 AM   #6
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Default Peter is right!

Quote:
Originally posted by Peter Daniel
Elso is a resident clock specialist. Maybe he could advise something?

Ask Elso and I'm sure that he'll help you through it.


Best regards,


Audiofanatic
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Old 7th November 2003, 02:56 PM   #7
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Default Mods

Quote:
Originally posted by KevinLee
Hello Peter,

I have done extensive mods to my CD63, they are as follows:

1-removed muting transistors
2-removed dc blocking caps on output
3-op-amps changed to AD8620 via Brown Dog Adapters
4-All small caps near op-amps changed to silver mica.
5-All ICs shielded with aluminum & copper tape & connected to ground plane
6-soft recovery diodes for bridges
7-Os-Con or Cerafine throughout
8-Larger filter caps after bridge (Elna for Audio models)
9-unhooked headphone stage
10-de-coupled op-amps + & - pins to ground with .1uf ceramic & 1uf Os-Con
11-installed about 3 pounds of sound dampening material to panels & transport
12-installed Corcom medical grade RF/EMI filter
13-de-coupled all ICs to ground with ceramic cap

14-I have modified the circuit near the DAC as per acoustica.org (moved some caps around & cut some traces).

15I installed the clock with as short as possible connections.

The upper frequency is now terrible, very hard to listen to.

16I built an enclosure for the clock and shielded it with copper & aluminum & grounded it.

I do not know what to try know. Maybe I have to measure the output for DC and maybe I have to re-install the DC blocking caps.

I was wanting to sell the clock, as for me, the CD player sounds better without it.

I really hate to abandon this player, I was hoping the clock would take it to the next level and become a good cd player.

Any input or ideas from any of the members would be appreciated.

Best Regards

KevinLee
Hi KevinLee,
How can I ignore your post after so much encouragement

I am not familiar with the Audiocom clock but I doubt it is that bad. Ric Schultz even prefers the 45 MHz version over Lcaudio and others. Maybe the cause for the bad sound is elsewhere.
I have put numbers before your mods for easy reference.
I agree with mod# 1, 2, 5, 6 , 11, 12, 15.
I am not happy with the AD8620. Did you lower the supply voltage to +/-12 or 13 V? The AD8610 I tried gave emphasis on the highs I did not like. As an IV-converter the OPA604 gave a much more "organic sound". The OPA2604 is the dual version.
I would replace the silver mica caps in the low pass filters by polypropylenes BC Components or older Philips stock. Fred also does not like silver mica’s in analog circuits. The silver mica’s give an impressive Hifi-isch "snap in the ear" sound but in the long run they are very fatiguing. These BC caps have excellent accuracy and temperature stability.
Also Polypropylene decoupling caps give a more pleasant sound than ceramics. I started with ceramics then switched to polyester, easy to fit, as these are small, and eventually went for polypropylenes.
I am not sure about Oscons and Cerafines in analog circuits, as I have never tried these.
I hope this helps a bit.
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Old 7th November 2003, 03:01 PM   #8
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Hello Elso,

Thanks for the advice.

I will try these changes one at a time and then re-evaluate the player.

I will post my findings after that.

Regards

KevinLee
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Old 7th November 2003, 03:03 PM   #9
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I agree with your opinion on silver micas. I usually don't use them, as I once tried to add a small silver mica in parallel with a large film cap in tweeter, and it simply sounded like crap
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“Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC
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Old 7th November 2003, 03:12 PM   #10
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Elso & Peter,

The silver mica caps have been in place for a very long time, and I have been happy with the sound of the player up until the clock install.

I will try replacing the AD8620s first.

Thanks

KevinLee
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