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Old 22nd March 2004, 02:17 PM   #1
hacknet is offline hacknet  Singapore
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Default Choke Loaded Zen

sorry for the silly question but would having too much inductance have ill effects on the amp?

how does one come to the figure of 50mH?

Thanks in advance!
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Old 22nd March 2004, 03:25 PM   #2
Magura is offline Magura  Denmark
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How wonderful to find somebody as ignorant as myself

If you look at the choke loaded XSOZ thread, youll find me asking the same question, and somebody spelling out the answer.

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Old 22nd March 2004, 03:25 PM   #3
azira is offline azira  United States
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Because you would suddenly have a 3-cu.ft. amp that weighs 150 lbs. Most of these amps are large 'cause of heat sinks but that would be a litlte much..

Actually the larger the coil, the lower the low frequency rolloff, so you would ideally want a very large value, but there are limits of practicality to think about.

large coil also helps for PS filtering in the same way it extends low freq response..
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Old 22nd March 2004, 10:07 PM   #4
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Default Re: Choke Loaded Zen

Quote:
Originally posted by hacknet
sorry for the silly question but would having too much inductance have ill effects on the amp?

how does one come to the figure of 50mH?
I used about 1 Henry, as I wanted some bottom end. 50 mH
is only going to give you about 6 ohms worth of reactance
at 20 Hz. If you're operating above 100 Hz, it probably
would be perfectly adequate.
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Old 22nd March 2004, 10:49 PM   #5
Magura is offline Magura  Denmark
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Not that i remember the formula, but to get 20Hz into 8 ohm, you will need a 80mH inductor.


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Old 22nd March 2004, 11:39 PM   #6
Magura is offline Magura  Denmark
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After quite a search, i found the thread i told about in an earlier post.

Choke Loads for Zen/Aleph Amps

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Old 28th March 2004, 07:30 AM   #7
hacknet is offline hacknet  Singapore
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sorry for the late reply...

i think 80mH isn`t too hard. it seems rather possible.

thanks for the link!
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Old 29th March 2004, 07:43 AM   #8
djk is offline djk
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Speakers with very low Qts are quite efficent and frequently vented.

Think classic Altec, JBL.

Venting these drivers to 30hz~40hz causes a peak in the impedance in the 60hz~70hz region.

It may be needed to add a 30 ohm resistor in parallel with the speaker for best operation.

Play it by ear.

Note:

This helps PP tube amps with small iron too.
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Old 30th March 2004, 07:27 AM   #9
hacknet is offline hacknet  Singapore
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hmm... i see the problem. i`m looking at increasing the impedance...
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Old 30th March 2004, 04:26 PM   #10
Tyimo is offline Tyimo  Hungary
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Hi!
Do we speak about this?
Is the 100 mH enough also on 6 Ohm speakers?
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