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Old 25th May 2006, 01:41 AM   #1
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Default Another potential stunner from Greg Ball

Greg has made it known that a new iteration of the SKA is comming.

He hasn't given much away other than its a few weeks away and this:

Quote:
It's a nested design with the potential for < 0.00001% THD. Trouble is my test resolution is only barely 110 dB or 0.0003% so I can't finesse it further without a balanced and higher resolution soundcard with higher sampling as well.
Looks interesting and I'm a fan of the original SKA so this is good news.
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Old 25th May 2006, 01:42 AM   #2
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And an early measurement.

The noise floor is limited by Gregs current test setup. I believe he's looking into new equipment though.
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Old 25th May 2006, 01:49 AM   #3
anatech is offline anatech  Canada
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Hi ShinOBIWAN,
It's always nice to hear of success. Too bad Greg didn't go for a thread in the Vendor's Bazaar. He can't market these kits through discussions in general threads. I assume this will be a kit as well?

-Chris
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Old 25th May 2006, 01:55 AM   #4
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Quote:
Originally posted by anatech
Hi ShinOBIWAN,
It's always nice to hear of success. Too bad Greg didn't go for a thread in the Vendor's Bazaar. He can't market these kits through discussions in general threads. I assume this will be a kit as well?

-Chris
Sigh...

Greg isn't marketting anything, at least not here in this thread. I took the initiative and made mention of it because it looks exciting.

Since this is obviously a contravention of diya bureaucracy, feel free to close/move/delete or whatever it is you do so well. I was however hoping for some discussion, a crazy idea I know, shame on me for thinking this was a forum of all things
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Old 25th May 2006, 02:00 AM   #5
mlloyd1 is offline mlloyd1  United States
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sounds interesting: an updated version of one of his older successful designs with stuff he learned for the SKA.

i wish the picture was better quality. it might be fun to guess at the design until it's shared.

and how can you measure distortion that low with a pc anywhere nearby

mlloyd1
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Old 25th May 2006, 02:04 AM   #6
anatech is offline anatech  Canada
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Hi ShinOBIWAN,
Actually, I'm glad you mentioned it. A discussion is fine as long as we stay away from marketing. Just being cautious given the history.

I am glad to hear Greg has something else good on the go. It's just that we are talking about a product, not a project. We need to remember that. Say hi to Greg for me.

Your comments and impressions are welcome on Greg's work.

-Chris
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Old 25th May 2006, 02:11 AM   #7
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Quote:
Originally posted by anatech
Hi ShinOBIWAN,
Actually, I'm glad you mentioned it. A discussion is fine as long as we stay away from marketing. Just being cautious given the history.

I am glad to hear Greg has something else good on the go. It's just that we are talking about a product, not a project. We need to remember that. Say hi to Greg for me.

Your comments and impressions are welcome on Greg's work.

-Chris
As you may or may not already know, I've sold my GB150's and GB300's.

So rest assured that I have little interest in anything other than the technical merits of the design. I'm thinking of giving this one a try but will likely wait for opinions to come in before purchasing. Since little is known then I guess that it will be guesswork for now.

If the SKA is anything to go by, Greg won't be detailling design specifics unfortunately. I should imagine a schematic without values will be forthcomming though but don't quote me on that.
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Old 25th May 2006, 02:56 AM   #8
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Quote:
Originally posted by ShinOBIWAN


As you may or may not already know, I've sold my GB150's and GB300's.

So rest assured that I have little interest in anything other than the technical merits of the design. I'm thinking of giving this one a try but will likely wait for opinions to come in before purchasing. Since little is known then I guess that it will be guesswork for now.

If the SKA is anything to go by, Greg won't be detailling design specifics unfortunately. I should imagine a schematic without values will be forthcomming though but don't quote me on that.
Shinobiwan,

Why did you sell SKA?


(Still haven't heard one... any one in Sydney??)


WRT new SKA, looks like Greg is doing the OPA627 front end
version that he has mentioned elsewhere.

Cheers

Terry
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Old 25th May 2006, 04:40 AM   #9
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Quote:
Originally posted by Terry Demol


Shinobiwan,

Why did you sell SKA?


(Still haven't heard one... any one in Sydney??)


WRT new SKA, looks like Greg is doing the OPA627 front end
version that he has mentioned elsewhere.

Cheers

Terry
A couple of small objections to the sound were the reason for selling. I've got a bit of weakness for swapping and trying out different things audio related, so that factors in too... sometimes you don't realise how good you've got it until you swap to something else.

Greg did make mention of the opamp used:

Quote:
The chip's a BB OPA134PA (not TI) and the design is totally DC coupled so no DC adjust, no servo, with < 10mV (typ 5mV) at the output. The Tcomp is the NTC bead thermistor shown.
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Old 25th May 2006, 07:46 AM   #10
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Quote:
Originally posted by ShinOBIWAN


A couple of small objections to the sound were the reason for selling. I've got a bit of weakness for swapping and trying out different things audio related, so that factors in too... sometimes you don't realise how good you've got it until you swap to something else.

Greg did make mention of the opamp used:

OK. What did you go back to or aquire to replace it?

cheers

Terry
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