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KGSSHV Carbon Build Thread


mwl168

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Agree, Birgir 100%.  This phase splitter measured like shit on the scope.  But there are situations that I need SE.  Like for testing, it's a pita to haul my Yggy out , so a SE CD player would have to do.  Will switch the power to the splitter off when using XLR when all tests are done.

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On 6/28/2016 at 1:15 PM, mwl168 said:

I am fairly certain I've measured similar effect of my Carbon which I have been listening to on and off for months without issue.

I do disconnect my headphone before power on and off.

Was listening to my Carbon/009 tonight and before I shut it down I measured the offset. I have the opto servo engaged and the offset was hovering under 1 VDC while the amp is on. Upon shutting down the power, within a second or two, the offset shot up to just under 200 VDC and gradually declined from there. 

I plan to disable the opto servo and when I do that I will measure the offset again and report back.

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6 hours ago, JoaMat said:

While experimenting - shut down HV with LV remaining and see what happens.

Will do. 

It may be a while before I get around to it - have been working on resolving a noisy I2S connection problem for the past month.

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First start. I'm not lucky

I have all VRs adjusted to mid point

I turn on R channel; both leds shine. A second later, led arround PZTA56, don´t shine (+rail). Turn off the amp and the this led shine again!!! (until the capacitor discharges). The Led arround PZTA06 shine all time. Check Volt on + rail: 1,5 volt. Volt on - rail: -15 volt. No smoke or blown.

L channel, it´s similar to R; the same led is shining and then stop. :wacko:

 

 

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56 minutes ago, jose said:

First start. I'm not lucky

I have all VRs adjusted to mid point

I turn on R channel; both leds shine. A second later, led arround PZTA56, don´t shine (+rail). Turn off the amp and the this led shine again!!! (until the capacitor discharges). The Led arround PZTA06 shine all time. Check Volt on + rail: 1,5 volt. Volt on - rail: -15 volt. No smoke or blown.

L channel, it´s similar to R; the same led is shining and then stop. :wacko:

 

 

you might check your low voltage ... have the CT been connected correctly?

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Thanks guys. Yesterday I was until 2 AM checked the amps. All components is OK, correct solders, all conections OK. Finally, I moved the trafo wires and I saw something, when I moved it the led shine sometimes. I saw that the PSU socket was rare: I desoldered this piece and a pin on the socket base was broken.

I don´t remember too tightly. I had had chinese sockets with this problem but not a Phoenix.

So I turned on and all was OK. Leds shine, volt ok. I adjusted the current to 1 volt (20 mA) and then I went to sleep.

Tonight I´m working with the balance and off set.

Thanks for your patience.

Edited by jose
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8 minutes ago, jose said:

Thanks guys. Yesterday I was until 2 AM checked the amps. All components is OK, correct solders, all conections OK. Finally, I moved the trafo wires and I saw something, when I moved it the led shine sometimes. I saw that the PSU socket was rare: I desoldered this piece and a pin on the socket base was broken.

I don´t remember too tightly. I had had chinese sockets with this problem but not an IC&C.

So I turned on and all was OK. Leds shine, volt ok. I adjusted the current to 1 volt (20 mA) and then I went to sleep.

Tonight I´m working with the balance and off set.

Thanks for your patience.

which pin?

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Just now, jose said:

CT pin.

I feel like a stupid :unsure:. Spend two hours to review all and spend your time too

 

 

Nothing stupid about that at all and you didn't spend my time.
I saw something similar a while ago, and spend some time tracking that down as well.
Components "allmost working" can be rather time consuming and cause chasing a lot of red herrings

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On 7/3/2016 at 0:35 AM, mwl168 said:

Was listening to my Carbon/009 tonight and before I shut it down I measured the offset. I have the opto servo engaged and the offset was hovering under 1 VDC while the amp is on. Upon shutting down the power, within a second or two, the offset shot up to just under 200 VDC and gradually declined from there. 

I plan to disable the opto servo and when I do that I will measure the offset again and report back.

Tried again tonight without the servo engaged. Similar result - offset shot up to about 170 VDC a couple of seconds after power off. 

Will try leaving the LV supply on and see what happens as JoaMat suggested next - need to rig something up to separate the HV and LV power switches.

Edited by mwl168
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On 09.09.2015 at 8:46 PM, mwl168 said:

kgsshvcarbonv5.zip (amp board)

kgsshvpssicfetdual2new.zip (GoldenReference HV power supply, all-in-one version)

kgsshvpssicfetsinglenewrightfat.zip (GoldenReference HV power supply, B+ and bias) 

kgsshvpssicfetsinglenewleftfat.zip ( GoldenReference HV power supply, B- and 7815/7915 based +/-15V regulator)

goldenreference4.zip (GoldenReference LV bipolar power supply)

goldenreference4plus.zip (GoldenReference LV V+ power supply   

goldenreference4minus.zip (GoldenReference LV V- power supply)

bias.zip (stand alone regulated Pro and Normal bias supply) 

Why links are inactive? Should buy it? Where then and how much?

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You should read some threads on the DIY forum here, starting with this one: http://www.head-case.org/forums/topic/11779-stax-mafia-circuit-boards/

You will only be able to buy these boards if someone makes them available for sale, or if you order a manufacturing run for yourself. Some posts here contain discussions about where and how to do this.

 

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