Author Topic: qsxm3  (Read 20880 times)

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Offline yiancar

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Re: qsxm3
« Reply #15 on: October 16, 2013, 10:19:17 PM »
its basicly a beogram 2000. yep ivegot a converter :). should i mess with its wiring or the problem maybe on the preamp?

Offline peranders

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Re: qsxm3
« Reply #16 on: October 16, 2013, 10:36:06 PM »
You must somehow break the ground loop. Your RCA terminals must not be connected to the chassies.
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Offline yiancar

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Re: qsxm3
« Reply #17 on: October 17, 2013, 04:38:50 AM »
any other things i should check for a ground loop?

Offline peranders

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Re: qsxm3
« Reply #18 on: October 17, 2013, 06:19:16 AM »
Is the TT chassis going through the adapter in someway?
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Offline yiancar

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Re: qsxm3
« Reply #19 on: October 17, 2013, 03:25:26 PM »
through? in what way?

Offline peranders

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Re: qsxm3
« Reply #20 on: October 17, 2013, 04:57:46 PM »
If you measure the resistance between your ground in your phono plugs and the chassi in the TT, which value do you get, high or low resistance?
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Offline yiancar

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Re: qsxm3
« Reply #21 on: October 17, 2013, 10:45:25 PM »
ok fixed the ground loop, it was the wire going from the rca to the input pins. now my toroidal transformer is causing hum. i have it a good 5cm away from the power supply part of the board but i can still hear it. perhaps its a cheapo transformer? any suggestions for a fix and a quality transformer ?

Offline peranders

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Re: qsxm3
« Reply #22 on: October 17, 2013, 10:50:07 PM »
Good the you fixed the ground loop.

Is it mechanical noise from the transformer?
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Offline yiancar

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Re: qsxm3
« Reply #23 on: October 17, 2013, 10:55:05 PM »
what do you mean mechanical?

Offline peranders

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Re: qsxm3
« Reply #24 on: October 17, 2013, 11:20:09 PM »
Is it vibrations or can you hear in your speakers?
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Offline yiancar

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Re: qsxm3
« Reply #25 on: October 18, 2013, 04:41:47 AM »
i can hear it in my speakers, changes with the orientation and proximity of the transformer and the board

Offline peranders

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Re: qsxm3
« Reply #26 on: October 18, 2013, 06:12:04 AM »
OK, then you have magnetic coupling. A small toroidal transformer would probably do the trick.
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Offline yiancar

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Re: qsxm3
« Reply #27 on: October 18, 2013, 06:22:48 AM »
i already have one in an aproximate distance of 5 cm ( the outer from the pcb) and its still picking up noise. maybe it is missfunctional? btw i can hear the noise only with the volume of my amp at 3;4 and above

Offline peranders

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Re: qsxm3
« Reply #28 on: October 18, 2013, 07:16:11 AM »
You say noise, you don't mean hum? Does it go away if you move the transformer?
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Offline yiancar

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Re: qsxm3
« Reply #29 on: October 18, 2013, 08:27:59 AM »
hum i mean yes. yes woth the trasnformer further away, ( out of the case) the hum dissapears. is it normal fora such a transformer to need so much distance?