choke

tenderland · 17th August 2005, 01:54 PM

Ihave built a 2a3 amp using one power xformer and choke fro both ch
I want to now build it dual mono. the choke in the origonal design feeding both ch b+ was 10 h 150 MA I know I dont need the same current rating but what about the inductance ?

Jeff

kmtang · 17th August 2005, 02:13 PM

It is better to use same rating of 10H 150mA choke for Mono's too. Lower current rating of choke would have higher internal resistance which is not so good.

I used a BIG 10H 300mA choke stereo 45 amplifier for it's low resistance.

Johnny

PRR · 17th August 2005, 05:07 PM

On paper, you want a pair of 20H 75mA, and half the capacitance.

But caps are cheap. If you stick with the 2-ch cap value in a 1-ch amp, you could stay with 10H (75mA) or maybe less.

As Johnny says, 10H and 150mA will often run like 15H when only passing 75mA. It isn't very critical, as long as you do NOT exceed the current rating, and the inductance is "close".

gerd · 18th August 2005, 01:41 PM

Hello,

better solution is to use chokes with the same losses ( doubled resistance), this gives at the same dimension of every choke a 2 times higher inductivity.
result: 2 times better smothing at the same losses per choke.

My preferred solution: Use one smothing for both channels with two CL-combinations in series, each with an half inductivity/dc-resistance of the original choke, then you will get much better smothing , at the same losses like before.

Gerd

17th August 2005, 01:54 PM	#1
tenderland diyAudio Member Join Date: Jul 2004 Location: us	choke Ihave built a 2a3 amp using one power xformer and choke fro both ch I want to now build it dual mono. the choke in the origonal design feeding both ch b+ was 10 h 150 MA I know I dont need the same current rating but what about the inductance ? Jeff __________________ "If every one is making wheels , why make wheels ? " Steve Jobs

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17th August 2005, 02:13 PM	#2
kmtang diyAudio Member Join Date: Nov 2004 Location: Vancouver	It is better to use same rating of 10H 150mA choke for Mono's too. Lower current rating of choke would have higher internal resistance which is not so good. I used a BIG 10H 300mA choke stereo 45 amplifier for it's low resistance. Johnny

17th August 2005, 05:07 PM	#3
PRR diyAudio Member Join Date: Jun 2003 Location: USA	On paper, you want a pair of 20H 75mA, and half the capacitance. But caps are cheap. If you stick with the 2-ch cap value in a 1-ch amp, you could stay with 10H (75mA) or maybe less. As Johnny says, 10H and 150mA will often run like 15H when only passing 75mA. It isn't very critical, as long as you do NOT exceed the current rating, and the inductance is "close".

18th August 2005, 01:41 PM	#4
gerd diyAudio Member Join Date: Jan 2004 Location: Thüringen	Hello, better solution is to use chokes with the same losses ( doubled resistance), this gives at the same dimension of every choke a 2 times higher inductivity. result: 2 times better smothing at the same losses per choke. My preferred solution: Use one smothing for both channels with two CL-combinations in series, each with an half inductivity/dc-resistance of the original choke, then you will get much better smothing , at the same losses like before. Gerd

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