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Old 11th May 2013, 04:23 PM   #431
spurlte is offline spurlte  United States
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Default Heat Sinks

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Originally Posted by Stuart Easson View Post
The immersed PC display I saw used mineral oil, IIUC it's not hydroscopic and largely inert as far as other components are concerned. If you are going to immerse the whole motherboard you can probably just dispense with anything more than trivial heat-sinks with wide space fins, oil and water are much harder to pump between closely spaced fins.
Just wanted you to know that your parts are hard a work. I received them a little banged up, but I truly appreciate your effort in helping succeed in building this beast. Thanks Stu
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Old 11th May 2013, 04:34 PM   #432
spurlte is offline spurlte  United States
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Originally Posted by Kaplaars View Post
Hahaha Hmm what I would prefer are slow blow (SB) fuses at the primary side of the transformer (because of the large inrush current caused by the transformer) and fast blow (FB) at the secondairy side of the transformer.

By the way nice setup David! Finally the fun part can begin!

Alibear; the original FETS are still around. I've bought a couple via this forum. Via DIYaudio member Zhoufang. You could try to contact him if he has still a few around. See:

FS: Toshiba 2SK2013 / 2SJ313
Yes Kaplaars, Zhoufang has been on the run and missing for awhile--seems there are some complaint. But what do you think of this ebay offer from ebay from Israel? I got them albeit the shipping took forever, but them seem legit.
4X 2SJ313 2SK2013 Original Toshiba MOSFET 2 2 | eBay
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Old 11th May 2013, 04:36 PM   #433
spurlte is offline spurlte  United States
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Hi all , OK I have decided to order boards from JIMS Audi. Does anyone know of equivalents to the 2SK2013 and 2SJ313 FET's .
Thanks
Alan
I got mine from here and I hope they are good.
4X 2SJ313 2SK2013 Original Toshiba MOSFET 2 2 | eBay
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Old 11th May 2013, 05:51 PM   #434
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Looking good Spurtle!

I picked my up fets here, if you don't want to go the ebay route:
FS: TOS 2SK2013/2SJ313

Been on the transistor search, been able the find 2SA970 but not 2SC2240. Could MPSA42/92 or BC549/BC560 be used for Q1-Q4?

Btw..Jim's latest boards have the corrections that were discussed earlier in this thread.
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Old 11th May 2013, 06:26 PM   #435
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Originally Posted by spurlte View Post
Yes Kaplaars, Zhoufang has been on the run and missing for awhile--seems there are some complaint. But what do you think of this ebay offer from ebay from Israel? I got them albeit the shipping took forever, but them seem legit.
4X 2SJ313 2SK2013 Original Toshiba MOSFET 2 2 | eBay
Aha Alweit! Yes, I've bought a pair of SJ74's from him in the past. These were 100% geniune. I think Alweit is a relieable source.
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Old 15th May 2013, 07:12 AM   #436
alibear is offline alibear  United Kingdom
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Hi all,I am awaiting arrival of boards from Jim's audio but I am confused over which circuit they actually use. There seems to be quite a few versions of the Mk 2. Can anyone post the circuit that Jim uses, so I can get myself sorted out with parts etc. so I can start building as soon as possible.
Thanks
Alan
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Old 16th May 2013, 06:38 PM   #437
spurlte is offline spurlte  United States
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Default New PCBs.

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Originally Posted by MEGA-amp View Post
Looking good Spurtle!

I picked my up fets here, if you don't want to go the ebay route:
FS: TOS 2SK2013/2SJ313

Been on the transistor search, been able the find 2SA970 but not 2SC2240. Could MPSA42/92 or BC549/BC560 be used for Q1-Q4?

Btw..Jim's latest boards have the corrections that were discussed earlier in this thread.
I barked at Jim's Audio (Stanton), about Kaplaar's findings and it just makes me feel really good that he at least responsed to our inquiry. But to actually fix the problem, well I have to say, there were a bunch of people who at to say a lot about how Chineese products are ****. At least we have Jim's Audio who does have worth while products for us do-it-yourselfers. But he said he was thinking of putting together at a kit form of the ksa-100 MKII. I wonder if he ending up having as much problems of finding the all the right parts and backed off. But stil, three cheers for Jim's Audio. I am also building his Marantz 7c phono preamp with PSU PCBs. All I need now are the appropriate transformers. I think that we, as diyaudio'ers, should continue to bark at Jim's Audio, as this would demand quality merchandise for OUR efforts.
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Old 16th May 2013, 06:58 PM   #438
spurlte is offline spurlte  United States
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Attachment 349107

Attachment 349108
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File Type: pdf delta-audio_output_board_2a.pdf (73.4 KB, 96 views)
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Old 16th May 2013, 09:14 PM   #439
alibear is offline alibear  United Kingdom
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Hi all, thanks Spurite for the great information. Have you a circuit diagram of Jim's boards that you can post so that I can start getting components up together.
Thanks for your help
Alan.
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Old 17th May 2013, 01:24 AM   #440
spurlte is offline spurlte  United States
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Originally Posted by alibear View Post
Hi all, thanks Spurite for the great information. Have you a circuit diagram of Jim's boards that you can post so that I can start getting components up together.
Thanks for your help
Alan.
Hey, where you been? There is no anything on Jim's boards otherwise we would all have one. What you see is what you get. Sorry. I had to learn this too. Now. Why would you want more than what is available from the threads available here from here--diyaudio?
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