Craft Audio CA1 (CRAFTAUDIO CA-1) Power Amp - looks like CAS-1 - Schematic wanted - diyAudio
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Old 10th January 2012, 11:38 AM   #1
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Default Craft Audio CA1 (CRAFTAUDIO CA-1) Power Amp - looks like CAS-1 - Schematic wanted

This power amp looks kinda like Threshold's CAS-1 (from the face view) go to
Threshold Model CAS-1
and
Threshold CAS 1
Threshold Amplifier - Overview and Schematic Collection of all Models

And the brand name sounds like Craaft Audio from Germany (the roof of the brand NOVA© resp.NOVACOUSTIC©).
Company
SOLTON® :: aaCRAAFT®: Home
SOLTON® :: aaCRAAFT®: Analog Amplifiers

From this NZLD brand, model "CA-1" (CA1) I want to have a schematic diagram.
Who can post this?
first four images shows this amp, the other attachments German's models of Craaft
Thank you very much
Attached Images
File Type: jpg CraaftAudio CA1 front.jpg (53.2 KB, 231 views)
File Type: jpg Craaftaudio CA1 openIl.jpg (51.0 KB, 227 views)
File Type: jpg Craaftaudio CA1 openl.jpg (40.9 KB, 218 views)
File Type: jpg Craaftaudio CA1 openlII.jpg (42.5 KB, 215 views)
File Type: jpg Craaft CPA1202.jpg (136.4 KB, 211 views)
File Type: jpg craaft cpa1200 front.jpg (61.7 KB, 79 views)
File Type: jpg Craaft clone TA2400.jpg (161.9 KB, 96 views)
File Type: jpg Craaft bass-ad18174_big.JPG (33.6 KB, 82 views)

Last edited by tiefbassuebertr; 10th January 2012 at 11:56 AM.
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Old 10th January 2012, 07:23 PM   #2
NMOS is offline NMOS  Germany
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Quote:
Originally Posted by tiefbassuebertr View Post
This power amp looks kinda like Threshold's CAS-1 (from the face view) go to
Threshold Model CAS-1
and
Threshold CAS 1
Threshold Amplifier - Overview and Schematic Collection of all Models

And the brand name sounds like Craaft Audio from Germany (the roof of the brand NOVA© resp.NOVACOUSTIC©).
Company
SOLTON® :: aaCRAAFT®: Home
SOLTON® :: aaCRAAFT®: Analog Amplifiers

From this NZLD brand, model "CA-1" (CA1) I want to have a schematic diagram.
Who can post this?
first four images shows this amp, the other attachments German's models of Craaft
Thank you very much

Craaft OEM chinese origin Manufacturer is REGAL Home page

since many years..in 2006 I did buy from Regal and Craaft

you can write me in german by private message
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Old 17th April 2013, 09:07 AM   #3
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any news regarded the schematics ?
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Old 25th May 2013, 09:03 PM   #4
timf1 is offline timf1  New Zealand
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Default Craft Audio

Hi,

Re Ca1 amplifier. Gary Morrison designed the Craft Audio CA1 and CA2.

Try the details below

https://twitter.com/GaryMorrison
The latest from Gary Morrison (@GaryMorrison). Co founder of PureAudio. See us at http://www.pureaudio.co.nz, follow us via @pureaudio. Wellington, New Zealand

Last edited by timf1; 25th May 2013 at 09:18 PM.
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Old 10th May 2015, 04:38 AM   #5
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Hi Guys,

Just got my self one of these
tiefbassuebertr you have the CA1 'B' model which was the mkII
The original came out in 1981 and was Gary Morrison's first Audo project
My PCB'd are dated (c) 1986, I think this might have been a small update on original

I got it with (Unknown at time) issues with the powersupply
I was getting +45vdc on the +ve rail and -100vdc on the -ve
I traced it down to a bad 0v lead on the transformer
Now DC power is a steady +-72.4v

But I'm having issues with one channel
I think the -100v may have done some damage
Nothing obvious to the eye
This channel/PCB no matter where BIAS is set to the MODFETs stay cool as do the RCA1A11/1A10

Other channel/board looks in better shape, but still 29years old
The bias adjust here will heat up the MODFETs and RCA1A11/1010's

I don't have any speakers worthy of testing properly yet, rebuilding my audio empire from scratch.
The old 100w 4way car speakers are my test bed.
I've got a B&K Pro 10MC pre-amp coming (mkI version with only volume/balance and source)

I get sound from both channels, very pleasing on the ears, great channel separation so giving me hope to restore this oldy
Just not sure if its worth it, the 2SK134/2SJ49 pairs are going to hard to replace if needed as no doubt the RCA1A11/1A10 pair also

Anyway, if someone has a Circuit diagram for one of these, that would help a whole heap.
And any helpful advice wouldn't go astray
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Old 10th May 2015, 05:24 AM   #6
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Quote:
Originally Posted by mobilenvidia View Post
.....Just not sure if its worth it, the 2SK134/2SJ49 pairs are going to hard to replace if needed as no doubt the RCA1A11/1A10 pair also....
Profusion PLC (UK & Europe) have been marketing their Exicon branded TO3 replacement for these LATFETs and the higher rated 2SK135/J150 pair, for decades now: Lateral MOSFET
Farnell/Element 14 also market the OEM ALFET branded versions: TT electronics Semelab Limited - Magnatec Lateral MOSFETs for Audio

Google brings up several existing threads about these TO3 types and other LATFETs here on DIYaudio.
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Old 10th May 2015, 05:45 AM   #7
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Cool, I'm thinking the MOSFETs should be OK, there is sound coming from the unit
Just the BIAS and offset measuring is jumping about all over the placr.
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