Crackling noise.... pls help on Pre-amp - diyAudio
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Old 8th April 2013, 10:18 PM   #1
tony Ma is offline tony Ma  United States
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Default Crackling noise.... pls help on Pre-amp

Hi there,

Here is my setting

HTPC - Tera dak - JP200 Clone (from analog metric) tube Pre-amp - B&K st-140 - Statement Speaker (from Jim and Curt Hotlz)

Previuously i have a problem with the PS on Pre-amp

Is there any thing wrong with this design

Now the problem is

When I turn on first time, i heard noise (that I define as a crackling) after about ten or fiften minute (about 2 -3 song) the noise is gone

Is this normal?

Is that because the tube need warming up? after 10 15 minute all crackling noise is gone and sound very sweet

Do I need Voltage stabilator?

Last edited by tony Ma; 8th April 2013 at 10:20 PM. Reason: more information
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Old 8th April 2013, 10:33 PM   #2
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No you don't need a voltage stabilizer you need to find the fault in the preamp and fix it.
ECC83's, dont't work well with such a high impedance on the anodes. 82 to 120K is high enough.
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Old 8th April 2013, 11:41 PM   #3
tony Ma is offline tony Ma  United States
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Quote:
Originally Posted by Harleyjon View Post
No you don't need a voltage stabilizer you need to find the fault in the preamp and fix it.
ECC83's, dont't work well with such a high impedance on the anodes. 82 to 120K is high enough.
iam sorry, iam newbee. Can you explain it?
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Old 8th April 2013, 11:53 PM   #4
roline is offline roline  United States
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Check any pots for dirt, tube to socket connections....
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SO many tubes, SO little time!!!
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Old 9th April 2013, 05:27 AM   #5
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clean all flux residue off of pc boards, make sure there is no flux in the socket if you are building point to point.
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Old 9th April 2013, 05:28 AM   #6
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when all else fails change the tube socket. especially if it is a ceramic one.
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