Choke Loaded Zen

hacknet · 22nd March 2004, 02:17 PM

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!

Magura · 22nd March 2004, 03:25 PM

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.

Magura

azira · 22nd March 2004, 03:25 PM

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..

Nelson Pass · 22nd March 2004, 10:07 PM

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.

Magura · 22nd March 2004, 10:49 PM

Not that i remember the formula, but to get 20Hz into 8 ohm, you will need a 80mH inductor.

Magura

Magura · 22nd March 2004, 11:39 PM

After quite a search, i found the thread i told about in an earlier post.

Choke Loads for Zen/Aleph Amps

Magura

hacknet · 28th March 2004, 07:30 AM

sorry for the late reply...

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

thanks for the link!

djk · 29th March 2004, 07:43 AM

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.

hacknet · 30th March 2004, 07:27 AM

hmm... i see the problem. i`m looking at increasing the impedance...

Tyimo · 30th March 2004, 04:26 PM

Hi!
Do we speak about this?
Is the 100 mH enough also on 6 Ohm speakers?

22nd March 2004, 02:17 PM	#1
hacknet diyAudio Member Join Date: Nov 2002 Location: sg	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!

22nd March 2004, 03:25 PM	#2
Magura diyAudio Member Join Date: Oct 2003 Location: Denmark, Viborg	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. Magura __________________ Everything is possible....to do the impossible just takes a little while longer. www.class-a-labs.com

22nd March 2004, 10:49 PM	#5
Magura diyAudio Member Join Date: Oct 2003 Location: Denmark, Viborg	Not that i remember the formula, but to get 20Hz into 8 ohm, you will need a 80mH inductor. Magura __________________ Everything is possible....to do the impossible just takes a little while longer. www.class-a-labs.com

22nd March 2004, 11:39 PM	#6
Magura diyAudio Member Join Date: Oct 2003 Location: Denmark, Viborg	After quite a search, i found the thread i told about in an earlier post. Choke Loads for Zen/Aleph Amps Magura __________________ Everything is possible....to do the impossible just takes a little while longer. www.class-a-labs.com

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22nd March 2004, 03:25 PM	#3
azira diyAudio Member Join Date: Dec 2003 Location: Near Seattle	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..

28th March 2004, 07:30 AM	#7
hacknet diyAudio Member Join Date: Nov 2002 Location: sg	sorry for the late reply... i think 80mH isn`t too hard. it seems rather possible. thanks for the link!

29th March 2004, 07:43 AM	#8
djk diyAudio Member Join Date: Feb 2001 Location: USA	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.

30th March 2004, 07:27 AM	#9
hacknet diyAudio Member Join Date: Nov 2002 Location: sg	hmm... i see the problem. i`m looking at increasing the impedance...

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