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Old 16th October 2012, 08:33 PM   #1
wknight is offline wknight  Israel
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Default Which choke is better ?

Hi
I am building phono preamp. Now I need to choose the choke for power supply "with good sound".

Maybe some of you have experience with:
1)
2)
3)
4)
5)
6)Valab 12H 200ma Filter Choke - Amorphous Metglass Double C-core UTC Transformer | eBay
or with something better ?
Thanks
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Old 16th October 2012, 08:46 PM   #2
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Can you post the schematic for you phono preamp?
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Old 16th October 2012, 09:12 PM   #3
wknight is offline wknight  Israel
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Default ok

It is not a complete schematic ...
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Old 16th October 2012, 10:02 PM   #4
euro21 is offline euro21  Hungary
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I think one C-L-C results tremendous hum in phono. Try CLCLC-RC (one RC for each channel).

150-200mA choke need for power amplifier, not for preamp. Expensive, heavy-weight and large.
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Old 16th October 2012, 10:22 PM   #5
wknight is offline wknight  Israel
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thanks for your answer
I am going to make voltage stabilizer after this PSU. EL84 + diff cascade.

Do you know good one for ~60-100mA ?

Last edited by wknight; 16th October 2012 at 10:24 PM.
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Old 16th October 2012, 10:36 PM   #6
euro21 is offline euro21  Hungary
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Hammond Mfg. - D.C. Filter Chokes - (153 - 159 Series)
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Old 16th October 2012, 10:55 PM   #7
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I suggest you to look into electronic based chokes. Tentlabs offer 3 different E-chokes and I know at least one DIY article on the Internet based on the same concept.

See the background article
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Old 17th October 2012, 02:55 PM   #8
wknight is offline wknight  Israel
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Quote:
Originally Posted by Nelson Bass View Post
I suggest you to look into electronic based chokes. Tentlabs offer 3 different E-chokes and I know at least one DIY article on the Internet based on the same concept.

See the background article
I think it is a kind of voltage follower plus filter.
I am going to use voltage regulator after CLC filter.

My question was about the quality ? I think chokes can sound differently.
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Old 17th October 2012, 04:19 PM   #9
disco is offline disco  Netherlands
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The only quality I can think of is the build quality. Properties like copper restance, self inductance and allowed (AC+DC) current matter and should be published. When building a choke input supply you better have a strong choke unit so it won't rattle as much on the chassis.
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Old 17th October 2012, 06:12 PM   #10
wknight is offline wknight  Israel
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Quote:
Originally Posted by disco View Post
The only quality I can think of is the build quality. Properties like copper restance, self inductance and allowed (AC+DC) current matter and should be published. When building a choke input supply you better have a strong choke unit so it won't rattle as much on the chassis.
I didn't find the data like self resonant frequency or the frequency dependence of the impedance.
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