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Old 27th February 2011, 08:27 PM   #4321
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Ok, as promised, results of the shigaclone vs Theta Data III transport.

The Shig is standard except for:
1. Removed choke, C916 and C952 and bypass caps
2. C916 replaced by a OSCON 47uF, 25V cap
3. 300/100 on digital output to 75R BNC connector
4. LM317 based 8V supply with around 2200uF pre and post regulator filtration
5. It is "naked" and sits on a bit of bubble wrap at the moment. No fancy mech isolation etc.

The Theta DATA III is a highly regarded "audiophile" reference that has:
1. 4 seperate transformers
2. AES/EBU reclocked output using a separate reference low noise clock (Guido Tent) and power supply (ALW)

The transports were played into the following setup:
Apogee mini-dac running off a 12V battery, which is a well regarded DAC based on AD1955 chip
Lightspeed passive pre-amp, which is the most transparent I've ever heard
KRELL 80B amps, one per channel run in vertical bi-amped mode (modded to lower noise floor etc)
Apogee Scintilla speakers (the 1 ohm version...)
Cables are wide-eye on the digital, van den hull on the dac/amps, all balanced. The Shig's output was single ended via BNC.

The result:
Highs: The theta has better resolution and separation here. It's almost like the highs are in a separate space. The Shig present's high's with less separaton

Mids: Cannot really discern differences, except that the Shig sounds "thicker"/"rounder". I actually prefer the Shig as it conveys more presence

Bass: No discernable difference!

Soundstaging: A bit more presence/forwardness on the Theta, but it's minor

Considering the difference in cost and complexity of build etc, this is a truly remarkable result!

If I can improve the Shig's highs, I'll sell the Theta!!

Peter and everyone else-thanks for sharing, you guys rock!

Best
Ryan
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Old 27th February 2011, 08:31 PM   #4322
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Good reading Dr. H.


Now, a fair bit of the sound of the shiga is its mechanical mounting. Mount it on something heavy and even experiment with damped springs etc. underneath.

Fran
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Old 27th February 2011, 08:34 PM   #4323
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Has anyone here tried the RF attenuators I mentioned back a few pages back?

See here (post 4111): click here

They really do make quite a difference, I would suggest to anyone to get a few of them at different values. Dr. H, they would be good at cleaning up the highs (and bass)


Fran
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Old 28th February 2011, 12:37 PM   #4324
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Today time to clean up the extra unneeded prints.......switched to its new power supply....

.....and hey it works...always an exciting moment when the plug goes in to the wallsocket......

Click the image to open in full size.

Click the image to open in full size.
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Old 28th February 2011, 01:12 PM   #4325
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Hi Fran,
Thanks for the idea, I've ordered some(10db and 15dB), will wait and see.
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Old 28th February 2011, 01:22 PM   #4326
Pocoyo is offline Pocoyo  Indonesia
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Hi Peter

as i know you try 3 kind capacitor in oscon caps position
the original, BGN 33uf and oscon caps, which one better ?

Thank you, best regards
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Old 28th February 2011, 01:30 PM   #4327
johnm is offline johnm  United Kingdom
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I'll be very interested to hear what people's experiences are using those RF attenuators on the SPDIF line. It's on my list of things to do, and I also have a SuperTeddyReg on order - curious what effect fitting this part in place of the 2x1000uF & 7808 combo will have. His reg is very highly thought of on the Pink Fish Media forums:

Teddy Pardo home of TeddyCap TeddyXPS power supply for Naim Audio replaces HiCap and XPS

SuperTeddyReg information is found by clicking in the DIY section on the left of the screen.

Also looking forward to receiving my ebony puck this week (MANY thanks Fran!). Something tells me that without the magnet there the laser will have an easier job of tracking the disc (as the focussing coils are not having to 'fight' the extra influence of the magnetic puck), and draw slightly less current which may well explain the slight improvements in sound people have experienced here.

I think I need to look at changing my SPDIF output resistors too. The sound from my Shiga just isn't as fluid and analogue-like as my original breadboarded version. I've used Takman carbon films at the SPDIF output. However from using them again in another project recently (a B1 buffer) they sounded very 'mushy' to my ears. Not sure how that would manefest itself on the digital output however, as in the B1 they were used in the signal path. The only other differences between my Shiga and Peter Daniel's recommended version is I'm using Rubycon ZLs for the 2 x 1000uF caps, but I don't think this dissatisfaction is due to those as I've used them many times in other projects before. The only other thing I can think of is the 47uF Black Gate N (used for C916) is doing its weird burn-in thing and will suddenly come on song after a bit more use. Wouldn't have thought the famous Black Gate burn-in would be so obvious when used in the PSU section though? The chassis used for my Shiga is made by Peter Daniel, so I think I can at least rule that out

- John

Last edited by johnm; 28th February 2011 at 01:47 PM.
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Old 28th February 2011, 02:08 PM   #4328
Pocoyo is offline Pocoyo  Indonesia
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Quote:
Originally Posted by Dr.H View Post
Ok, as promised, results of the shigaclone vs Theta Data III transport.

The Shig is standard except for:
1. Removed choke, C916 and C952 and bypass caps
2. C916 replaced by a OSCON 47uF, 25V cap
3. 300/100 on digital output to 75R BNC connector
4. LM317 based 8V supply with around 2200uF pre and post regulator filtration
5. It is "naked" and sits on a bit of bubble wrap at the moment. No fancy mech isolation etc.

Best
Ryan
Hi Dr. H

what is brand of your capacitor supply ?
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Old 28th February 2011, 02:43 PM   #4329
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I think they're Panasonic or Rubycon. Will check.

1. Has anyone tried RC snubbers on the rectifying diodes?
2. Any benefit in removing the ferrite core on the stock power supply?

Last edited by Dr.H; 28th February 2011 at 02:46 PM.
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Old 28th February 2011, 02:51 PM   #4330
Pocoyo is offline Pocoyo  Indonesia
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Quote:
Originally Posted by Dr.H View Post
I think they're Panasonic or Rubycon. Will check.

1. Has anyone tried RC snubbers on the rectifying diodes?
2. Any benefit in removing the ferrite core on the stock power supply?
first time when i used 2 pcs BG Std after and before rectrifier the sound was
too high

after i change to BGF & BG Std, theres a lot of different there
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