what type of inductor

[MEGA_amp]

Progress is slow going on my Aleph 2. I looked around but, i'm looking for a definitive answer about what type of inductor to use.

I've been looking at 12 ga. air core 2.2mH inductors. What are the advantages/disadvantages of using this type of inductor vs. the foil type inductor? From what i've read foil is better than regular wire wound inductor.

Thanks in advance

John

 

[MEGA_amp]

Shoulda looked harder

http://www.diyaudio.com/forums/showthread.php?s=&threadid=30106&highlight=



I've seen people using the foil type, but is it preferred soundwise overall, compared to the wirewound aircore.


Thanks
John

 

[Brian Donaldson]

The only real concern is to keek the resistance down so the thing doesn't melt the insulation and short. I don't see how the conductor's shape (wire or foil) could make a difference. It's only filtering 120 hz ripple and is decoupled from the amp by the second bank of caps

 

[Panelhead]

Progress is slow going on my Aleph 2. I looked around but, i'm looking for a definitive answer about what type of inductor to use.

I've been looking at 12 ga. air core 2.2mH inductors. What are the advantages/disadvantages of using this type of inductor vs. the foil type inductor? From what i've read foil is better than regular wire wound inductor.

Thanks in advance

John

For power supply filtering, I have been using cheap ferrite e-core chokes. The advantage is size and cost.
For something like a Aleph 2, an air core choke of 2.2 mH and a current capacity of 10 amps or so is very large.
My amps are much lower current than a 2, but a 2.7 mH, 6 amp choke was 5.95 at the local emporium. It would fit in your hand, 2 -3 pounds.

George

 

[GRollins]

My two cents worth is that the foil inductors would be wasted. Use regular wire inductors. Save the foil inductors for your speakers.

Grey

 

[MEGA_amp]

Why is it always a penny for your thoughts, but you put your two cents in, somebodys making a penny here.


---steven wright


Thanks for the info
JH

 

[Magura]

2.2mH air core 600W inductors are actually not that big. I made a few a while ago. For lots of power theyre un-beatable.

Magura

 

[GRollins]

There's a sign tacked on the wall here at work that says,"Every minute you're mad, you've lost a second of happiness."
I want to know what happened to the other 59 seconds.

Grey

 

[Magura]

Why is it always a penny for your thoughts, but you put your two cents in, somebodys making a penny here.


---steven wright


Thanks for the info
JH

2 cents is almost the same as a penny.....you see the reason it turnes out to be 2 cents and not 1.8 cent, is the exchange fee of the bank.

Magura

 

[moe29]

These are the inductors i used in my Aleph 2. They're 2mH.
I used to get them from MCM... but they quit stocking them, last time i looked.

 

[Super_BQ]

melting coils

moe29,

Those are the exact coils I 1st used in my SoZ many years ago. They lasted for more than an hour before we could smell the insulation melting on the coils.

In your case with the Alephs.. i don't see this being a problem

BQ

 

[jewilson]

Moe,

Did you ever do any listening to the amp with out the inductors? Back a while ago, I was designing some amplifiers for data acquisition system. It all seemed ok until we ran FFT impulse response, so with the inductors in the circuit it would cause the amplifiers to fail the FFT dynamic range test.

 

[moe29]

Jewilson - i don't know what FFT dynamic range is...

I have used these same inductors in a SOZ up to 10 watts with
no problem... BQ, weren't you at 25 watts?? I could see where
they'd probably overheat there.

There is a definite improvement to the hum or hiss that you can
hear when the amp is idling and you put your ear up to the
speakers - when these coils were added to the PSU for the ZEN amp.

I haven't tried removing them in the Aleph 2 to see how it would sound.

 

[dantwomey]

Another forum member recommended Hammond's 159ZL and I've found it to be an excellent choice. It has a very low DCR and a high current rating. Here's a pic of what I did:

An externally hosted image should be here but it was not working when we last tested it.

Regards,
Dan

 

[jewilson]

Be sure to sheild those dodad.

 

[K-amps]

Why is it always a penny for your thoughts, but you put your two cents in, somebodys making a penny here.

Thanks for the info
JH

The way the Dollar is falling, 1 penny will = 2 cents sooner than you think.

These are the inductors i used in my Aleph 2. They're 2mH.
I used to get them from MCM... but they quit stocking them, last time i looked.

Try www.partsexpress.com they have some very nice Jansen Coils.

K-