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Old 10th December 2011, 11:56 AM   #1
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Question Cary audio design SLI 80

Hi,
I have two OPT Ra-a 4.6k/rated 70w,UL 40%,hand wound on C-core.I have been looking for sheme of suitable pp design with KT88 around 70W class AB1.Perssonaly,I belive that amp. with tube rectified sound much better.Plese,if anybody have Cary SLI 80 circuit,sheme,photo better resolution beneath chassis,or any info to post it,or send to my e-mail.
Many thanks,
Attached Images
File Type: jpg SLI80silver_front_800.jpg (59.7 KB, 224 views)
File Type: jpg sli-80rear.jpg (72.7 KB, 218 views)
File Type: jpg bare_chassis.jpg (23.0 KB, 213 views)
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Old 18th December 2011, 06:50 PM   #2
pageboy is offline pageboy  United States
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Did you find anything? I'm curious about this also.
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Old 19th December 2011, 09:40 AM   #3
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Unfortunately,I have not found any documentation about it,
But in the meanwhile,I have dscovered one more interesting pp-ul with KT88 using same OPT as i mentioned above.The SAC Thailand product Glow Master with 6N1 input and 6N1 as drivers.So,I ask Thai Diyers,maybe they could help!?
Cheers,
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File Type: jpg AmpGlowmasterKT88-5.jpg (29.5 KB, 163 views)
File Type: jpg AmpGlowmasterKT88-pogled odozdo.jpg (71.0 KB, 165 views)
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Old 19th December 2011, 02:18 PM   #4
pageboy is offline pageboy  United States
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Does the Glow Master amp have a tube rectifier? I don't see one.

I do know of another circuit that uses a pair of KT88s and a tube rectifier that would be a good match for your transformers. It's in a book though. If you're interested, it's probably best to PM me with your e-mail address.
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Old 19th December 2011, 03:09 PM   #5
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Hi,
Glow master doesnt have tube rectification,it has 4 havy damper diodes,2H choke and 4x1000 uF/330Vdc.
Check the official SAC Thailand web.
Please,see specifications.
Regards,
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Old 20th December 2011, 04:03 AM   #6
pageboy is offline pageboy  United States
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I found pictures of the underside of the chassis of the Cary Audio SLI 80 right on their own website.

Cary Audio Design - SLI 80

And they're getting 40W in class A triode mode out of a pair of KT88s? I thought sure that wringing that much power of them in that set up would exceed the dissipation ratings. I'm curious how they're doing that.
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Old 20th December 2011, 07:18 AM   #7
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Quote:
Originally Posted by pageboy View Post
I found pictures of the underside of the chassis of the Cary Audio SLI 80 right on their own website.

Cary Audio Design - SLI 80

And they're getting 40W in class A triode mode out of a pair of KT88s? I thought sure that wringing that much power of them in that set up would exceed the dissipation ratings. I'm curious how they're doing that.
I think it is just sales talk, to get over the psychological 40W limit. I am sure Cary Audio does not want customer's valves to melt!
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Old 20th December 2011, 08:01 AM   #8
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It must be sales trick,It is impossible at same time have 40w A class and 80 W AB1 on same OPT.This is according KT88 data sheet.Maybe they achived something revolutionary.
Cheers,
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Old 20th December 2011, 01:00 PM   #9
pageboy is offline pageboy  United States
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I was beginning to think it was just sales talk myself. The only place I see 40W class A is the front page of that product on the website. It doesn't claim that anywhere in the specs or anywhere else. I was also wondering how it went from class A in triode to class AB1 in ultralinear with the flip of a switch. Yeah. There's no way it's all of 40W in full class A because that would certainly exceed the dissipation ratings of KT88s. It's a class AB1 in triode mode also.
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