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Old 4th October 2012, 02:54 PM   #331
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Thanks Sippy !
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Old 4th October 2012, 03:13 PM   #332
spurlte is offline spurlte  United States
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Default Paint it Black

Quote:
Originally Posted by Kaplaars View Post
Hi Friends,

Again an update, but a very little one. I attached the other D-SUB connector to the chassis:

Click the image to open in full size.

Isn't it pretty :-) But that is not why I post this update. Today I fired the KSA-100 up. Man what a sound. It is my birthday today, yay. So it is time to play some music. But I experienced a strange phenomenom; now and then the mains transformers were buzzing randomly pretty audible, osmething I've never experienced. Also the amplifier seem to draw 0,3A extra current. Hmm, that could not be OK. I was afraid there was something wrong with my amplifier. Maybe an heavy oscillation of something. At the same moment I was printing some papers. And yes it turns out my laser printer causes a large DC component on the net. This triggers the transformers in my KSA-100 to buzzzz. I don't use a DC-blocker in my Krell. Maybe it is time to construct one. Would a DC-blocker be beneficial or are there also some disadvantages using one?

I never thought a DC component could cause so much hum. Another lesson learned :-)
Happy B-Day Kaplaars! Can I suggest you could paint just the plate of the D-Sub black? Or just a black plastic strip to cover the plate around the connection and behind the bolt heads? This could also accentuate the bolt and connection heads.
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Old 4th October 2012, 03:24 PM   #333
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Thanks David ! Actually I've thought about that, but I think I like the silver more because the backplate and the handles are also silver. Also there is a practical disadvantage when painting the connector; when I would paint the chassis connector chances of scratching the paint off due to plugging the connector in and out would be a problem.
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Old 4th October 2012, 03:34 PM   #334
spurlte is offline spurlte  United States
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Yes, I agree. That is why I suggested just the back plate. C"est la vie. My project is on hold. I am sanding, staining and revarnishing all the floors in my home before winter--I need to be able to open windows for fumes to escape. How's the Goldmund project going?
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Old 4th October 2012, 04:01 PM   #335
Jozua is offline Jozua  South Africa
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Kaplaars

Now you need to burn the amp in and only then do you comment on the sound....

But whattda birthday present to yourself ! Something to mark the event and enjoy for a long time to come.

Regards

Jozua
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Old 4th October 2012, 09:56 PM   #336
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@David Oui oui David. Speaking French, actually this journey with building and completing this KSA-clone is becoming une belle histoire. Just like the song from Michel Fugain michel fugain - Une belle histoire - YouTube haha

So busy times in Chicago The Goldmund is still on a hold, but preparations have been made. But I am thinking of building a pre-amplifier first. There are some nice Audio Research SP-10 clone PCB's for sell on Ebay. It uses tubes, and since I like tubes very much, I think this would be a very nice next project.

@Jozua: Yes Jozua I am very VERY happy with the amp
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Last edited by Kaplaars; 4th October 2012 at 09:59 PM.
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Old 5th October 2012, 09:57 AM   #337
neychi is offline neychi  Croatia
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Michael, Happy birthday with some delay.

I'm glad that your project is at the end and above all, that you are satisfied with it
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Old 5th October 2012, 09:07 PM   #338
BMW850 is offline BMW850  Netherlands
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This I build for my 2 x 42v 2000Va toroidal.
More rest and depth in the sound (maybe toroidal less stress), and the main mechanical hum is gone from the Amplimo Ring core.
Just try, it is not the cost not to test.
DC-Blocker - Scintilla-buizenversterkers

Regards,
Rudy
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Old 5th October 2012, 09:32 PM   #339
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Thanks Dean!!

@BMW850; Hi Rudy, thanks for your input! I will try this little circuitry. I am curious about the results. Nothing causes problems, only my laser printer. It was a cheap one, so probably it's PSU allows applying a large DC-component on the net and is not proper filtered.

By the way,Rudy, did you solve the problems with your softstart?
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Old 5th October 2012, 10:01 PM   #340
BMW850 is offline BMW850  Netherlands
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Yes it is perfectly resolved with the seller.
This Softstart works as it should.

Regards,
Rudy
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