1H and 100mH single inductors

[Strawtles]

Hello, do you know where I can find some good 1H and 100mH single inductors for audio use (API 553 equalizer)?

 

[gyraf]

You can get 100mH off the shelf, but 1H is harder.

Maybe from wah-pedal supplies, if they are low enough resistance?

Otherwise, you'll need to roll your own.

In general, for sourcing questions, it's very good to have your location in your profile. Otherwise it's really hard to help.

Jakob E.

 

[Strawtles]

Hello Jakob, 
I have no experience with inductors, and I have read that generic inductors often are not good for audio appications
Can you suggest a good 100mH inductor model?
I have to put them in a API 553 Equalizer

 

[ruffrecords]

Right now I am waiting fro some 1H inductors made by Wilco in the USA. No idea if they are any good. I ordered them from Banzai Music:

http://www.banzaimusic.com/Wilco-1H.html

Cheers

Ian

 

[Strawtles]

I have read positive things about these inductors but unfortunately I have not seen the 100mH value in Banzai Music site

 

[gar381]

Right now I am waiting fro some 1H inductors made by Wilco in the USA. No idea if they are any good. I ordered them from Banzai Music:

http://www.banzaimusic.com/Wilco-1H.html

Cheers

Ian

Hi Ian

I tried the Wilcos in a 553 a few years ago along with some sample
inductors made by Gowanda.  I think to my ears the Wilcos were usable
but nothing that special.  The Gowandas were not as good.  I wound up
using the Inductors that peterc used in his 5003 EQs... much better.
I don't know if peterc still has these guys available or not.  They are
are transformer steel lam based and are rather large.

Let us know what your ears tell you about the Wilcos when you get them.

Regards

GARY

 

[Strawtles]

Hi Gary,
do you have compared the Wilco and Peterc inductors in the same circuit or in different projects?

 

[gar381]

Hi Gary,
do you have compared the Wilco and Peterc inductors in the same circuit or in different projects?

Same 553

GARY

 

[Strawtles]

Thank you Gary ... this means that I have to find other inductor for the best performance of my eqs!

 

[MicDaddy]

The core material can have a sound? hmm...

How about high vs low resistance?

What if we use some old mic transformer lams (not going to be of other use) and see what happens  8)

I kind of wanted an MEQ, hmmm mic lam MEQ inductors...  gapped or no, well how about I smack my head against it for awhile and see what happens.

Maybe some of the smart kids will come and throw some math at us.

 

[thomasdf]

Has anybody tried the Mesa Boogie 1H inductor ? It is super cheap !

 

[Tubetec]

Those Wilco inductors are 3 grams each , so there very tiny ,
Hard to imagine they will be able to pass even moderate signal levels without distortion .

In all the best audio gear that uses inductors you invaraiably find pot cores ,

I picked up a batch of tapped pot core inductors a few years back , they seem like they should be suitable for audio ,

I also got a handful of Mullard vinkor type pot cores but Im missing some of the mounting hardware/bobbins .

The two sellers who make decent audio inductors , AML and Don Audio , sell for as much money as a quality transformer ,

UTM industry has a few Neve style inductors at a competitive price ,
Sister company ? IGS audio also has some nice inductor based EQ's ,

 

[ruffrecords]

Has anybody tried the Mesa Boogie 1H inductor ? It is super cheap !

Very interesting. Unfortunately no spec on their website but definitely worth checking out and measuring.

Cheers

Ian

 

[Tubetec]

I found this , thought it might be of use ,
http://electrojumble.org.uk/Mullard_PotCore_Equivs.pdf
So I have two of these pot core types ,
LA1219 35 turns per mH
FX2240 15.5 turns per mH

LA 1219 type is a finished inductor ,made for the later transistorised WEM Copicat , so no point in thrashing them .

I tried 10 and 15 turns on the FX2240 its gives around 350 uH and 1050 uH and 0.35 and 0.55 ohms with wire of about 0.28mm (0.32mm including insulation)

Theres probably no point in trying to do anything with old fashioned core materials where availabillity is bound to be an issue ,
MOQ is the killer for the small time DIY producer , maybe a groupbuy scenario might work out if theres enough interest .

 

[thomasdf]

Those Wilco inductors are 3 grams each , so there very tiny ,
Hard to imagine they will be able to pass even moderate signal levels without distortion .

In all the best audio gear that uses inductors you invaraiably find pot cores ,

I picked up a batch of tapped pot core inductors a few years back , they seem like they should be suitable for audio ,

I also got a handful of Mullard vinkor type pot cores but Im missing some of the mounting hardware/bobbins .

The two sellers who make decent audio inductors , AML and Don Audio , sell for as much money as a quality transformer ,

UTM industry has a few Neve style inductors at a competitive price ,
Sister company ? IGS audio also has some nice inductor based EQ's ,

Since I may need 16 of them in the coming years I thought about asking UTM to make a 2 tap inductor…
But I’m not there yet

 

[Tubetec]

I have a China CNC coil winder sitting in storage at the moment ,
Once I get my new place settled out I hope to get back on track and wind some coils .

Don Audio seems to have greatly expanded his range of EQ inductors ,
prices are fairly keen as well , he also offers a few cores and bobbins for the DIY'er.

 

[lukas]

I can make it 2 tap inductors(...i can make one pcs for try if you interested)...Neve style.

 

[Tubetec]

https://www.digikey.com/en/products/detail/central-technologies/CTS7F-105K/16037158
That gives a clue about the axial style 1H inductors ,
sheilded apparently ,
410 ohms
Perhaps of use in a dynamic mic HPF , but probably no good for line level due to size .

Hi Lukas ,
Id be interested in trying one of your tapped inductors ,
what range of inductance can you provide on this core ?

I'll shoot you a pm for a chat ,

 

[abbey road d enfer]

The core material can have a sound? hmm...

Definitely. The cores with highest Al (nominal nH per turn) saturate earlier and vary more with level. Their advantage is that they need less turns, which results in lower DCR, which must be considered.

How about high vs low resistance?

The actual resistance of the inductor must be considered in regard to the circuit. Very often, a resistor is inserted if the inductor has too low DCR. Too low DCR results in increased boost/cut.

What if we use some old mic transformer lams (not going to be of other use) and see what happens 8)

Iron lams are generally for high value inductors. For 1H, you typically want a ferrite core.

 

[Matador]

I can confirm the 1H Mesa inductors work well in the few circuits I've tried them. The last ones measured about 600 ohms. For $5 they are a steal.