3nity

Neve inductors
« on: December 29, 2020, 11:29:21 AM »
Hi guys.
On a 1073 inductors.
You  think we can use small inductors like on the g pultec?

Out of curiosity.
« Last Edit: December 29, 2020, 02:12:03 PM by 3nity »
Life is a path, death the destination.


gyraf

Re: Neve inductors
« Reply #1 on: December 29, 2020, 11:57:25 AM »
I don't see why not?

What values are in there?

/Jakob E.
..note to self: don't let Harman run your company..

3nity

Re: Neve inductors
« Reply #2 on: December 29, 2020, 02:11:38 PM »
They go from .1H .2H .3H .6 H 1H
50mh 80mh 100mh 160mh 200mh
1.3H 3.0H 7.0H 10H

Those are the most commons.

I tried finding a small 10H ..lol it's huge and expensive!😂
Life is a path, death the destination.

gyraf

Re: Neve inductors
« Reply #3 on: December 29, 2020, 04:05:09 PM »
The small ones are realistic only up to some 100-150mH. Above that, better to wind your own...
..note to self: don't let Harman run your company..

3nity

Re: Neve inductors
« Reply #4 on: January 02, 2021, 10:27:19 PM »
It could be fun.
I simply know nothing about winding.
Will wait from Audio Maintenance to re stock!

Thanks Jakob!
Life is a path, death the destination.

shabtek

Re: Neve inductors
« Reply #5 on: January 03, 2021, 08:17:26 AM »
"really fine players do not use stomp boxes or master volume, they match the amp to the room and turn it up to 11.  Stevie Ray, BB King, Albert King, Duane Allman, Dicky Betts, Louis Armstrong"
   -CJ

Rocinante

Re: Neve inductors
« Reply #6 on: March 15, 2021, 12:19:32 AM »
http://www.amidoncorp.com/pot-core-sets/

I am curious how one would make a Carnhill VTB9043 from the inductors in your link?
If there's a harder way to do this, I haven't found it yet.

shabtek

Re: Neve inductors
« Reply #7 on: March 15, 2021, 07:03:13 AM »
I cannot seem to find the 77 pot core data sheet on their site.
there is a chart that tells you what size wire for given turns and a formula for determining turns needed for a given inductance @ a stated AL; you still need to measure and do some empirical observation as the charts' resolution is not good down where we are interested

I have it on an old drive somewhere...will have to look

this carnhill is the one that goes up to 10H so I would use the biggest core to allow the biggest wire

you still need to measure and do some empirical observation
NYD advised not making a tapped rather separate inductor for each value,fwiw.




https://groupdiy.com/index.php?topic=39578.msg489257#msg489257
"really fine players do not use stomp boxes or master volume, they match the amp to the room and turn it up to 11.  Stevie Ray, BB King, Albert King, Duane Allman, Dicky Betts, Louis Armstrong"
   -CJ

abbey road d enfer

Re: Neve inductors
« Reply #8 on: March 15, 2021, 08:01:58 AM »
NYD advised not making a tapped rather separate inductor for each value,fwiw.

https://groupdiy.com/index.php?topic=39578.msg489257#msg489257
I don't see such a post in this thread.
I'd be curious to know why someone would recommand doing that. Admittedly, multitap inductors are almost impossible to correct after the fact, other than rewinding them completely. Apart from that, it just makes sense.
Who's right or wrong is irrelevant. What matters is what's right or wrong.
Star ground is for electricians.

shabtek

Re: Neve inductors
« Reply #9 on: March 15, 2021, 12:35:46 PM »
I agree abbey, I was browsing through threads with 'amidon' in them --think dave may have been referring to matching values. it is not easy to get matching values and taps on the same core when winding by hand. tension variations of successive windings can change things. also in theory the core can only be optimized for 1 value.
 this is not meant to discourage. definitely diy worthy, matching for 1% is gonna take some work thats all.

let's see if this attachment works

"really fine players do not use stomp boxes or master volume, they match the amp to the room and turn it up to 11.  Stevie Ray, BB King, Albert King, Duane Allman, Dicky Betts, Louis Armstrong"
   -CJ


abbey road d enfer

Re: Neve inductors
« Reply #10 on: March 15, 2021, 03:04:34 PM »
I agree abbey, I was browsing through threads with 'amidon' in them --think dave may have been referring to matching values. it is not easy to get matching values and taps on the same core when winding by hand. tension variations of successive windings can change things
This shouldn't be an issue. When hand winding it is necessary to adjust the final value, which implies overwinding, measuring, cutting measuring, cutting until final value is achieved with desired precision. It's very tedious, since the core must be fully reassembled before measuring, but it's doable.

Quote
also in theory the core can only be optimized for 1 value.
I'm not sure what you mean by that...

Quote
let's see if this attachment works
It does, but I'm not sure these cores are suitable for audio inductors. They seem to be spec'd only for smps and converters.
Who's right or wrong is irrelevant. What matters is what's right or wrong.
Star ground is for electricians.

shabtek

Re: Neve inductors
« Reply #11 on: March 15, 2021, 03:25:16 PM »
I'm not sure what you mean by that...
 
I am speculating why NYD suggested 1 inductor per frequency.

I know tapped works fine in practice, hitting a given L and R value would be simplified by not having taps.

It does, but I'm not sure these cores are suitable for audio inductors. They seem to be spec'd only for smps and converters.
I've used them (amidon 77) for 1H and 100uH values in audio eqs (api copy) with success.

do you have suggestion for other core? 
I am curious what the difference is to rm8 or what carnhill uses
"really fine players do not use stomp boxes or master volume, they match the amp to the room and turn it up to 11.  Stevie Ray, BB King, Albert King, Duane Allman, Dicky Betts, Louis Armstrong"
   -CJ

abbey road d enfer

Re: Neve inductors New
« Reply #12 on: March 15, 2021, 06:33:07 PM »
I am speculating why NYD suggested 1 inductor per frequency.

I know tapped works fine in practice, hitting a given L and R value would be simplified by not having taps.
By using e.g. 4 separate inductors or one with 4 taps, the net workload is about the same...

Quote
do you have suggestion for other core? 
I am curious what the difference is to rm8 or what carnhill uses
TBH I've never used anything else than RM types. RM8 is quite small. I used mainly RM10 and RM14.
For any kind of repeatability, you have to use a gapped core. Ungapped have to high a tolerance (+30/-20%).
Since gapped cores have a lower Al, you need a larger core than an ungapped one, but you get much more linear response.
« Last Edit: April 07, 2021, 04:40:21 PM by abbey road d enfer »
Who's right or wrong is irrelevant. What matters is what's right or wrong.
Star ground is for electricians.


 

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