Cyburgs-Needle for Tangband W3-871S

[jemraid]

Dear Zigis,

I think Berndt took that link down because there was an error in the text, he put another diagram a bit further down the page:
http://www.diyaudio.com/forums/showthread.php?postid=558556#post558556 it's post No 19

Kind regards - Jem

 

[Zigis]

Thanks jemraid!
Good, I am upgrading my Needles to Tangband, but not ordered notch parts yet, now i now the right parts.

 

[EUVL]

A very quick and dirty prototype to make up for a very rainy Saturday!!
Everything 22mm MDF.

No filters and no measurements as yet.
Hope Henkjan will give some hints.


Patrick

 

[jemraid]

Dear Patrick,

Wow that was quick and they look very good too. I can't wait to find out what you think of the Alpair 6's, maybe Henkjan's on holiday.

I was thinking of trying the Dynavox FR88EX in my pair, I'm still using the FRS8's.

But, seeing everyone's ethusiasm for Mark's various Alpairs I think I will have to save up to buy a pair.

Jem

 

[Henkjan]

Henkjan,
What notch filter did you settle on in the end for the Needle with AP6 ? .... I read somewhere like 22µF, 0.33mH and 1.8R.

correct

 

[EUVL]

Could you also publish a SPL plot vs Freq ?


Thx,
Patrick

 

[jemraid]

Dear Patrick,

I think you will find this in post 519 - http://www.diyaudio.com/forums/showthread.php?postid=1792032#post1792032

At least I think t's what you want, I'm not a tech type person like Henkjan.

Jem

 

[Henkjan]

Could you also publish a SPL plot vs Freq ?

sorry, I did not save them.. started with measuring, followed by some tuning by ear

 

[chylld]

Thinking of upgrading from my b3s to the alpair6.

Henkjan, did you also require bsc, or was the notch filter enough?

 

[Henkjan]

just the notch was fine, just like the original Needle

 

[nukaidee]

I just wanted to once again confirm that the inductor value is 6.8mH not uH? all the air core inductors i see are all in nanohenries.. i didn't know they made them that big. also, is there a major difference if i use a electrolytic cap or tantalum instead of a poly or metallized film?

thanks

oh. ps. i am using the tb 871s

 

[Henkjan]

correct values for the W3-871 Needle:

• inductor: 0.56 mili henry
• capacitor: 6.8 micro farad
• resistor: 6.8 ohm

 

[nukaidee]

alright. i will continue hunting. thanks for the confirmation. apparently there are no 560uH air core inductors at digikey, newark nor mouser... sigh where do you guys get yours?

 

[AdamThorne]

It was a while ago, but I think I used one of these:
http://www.parts-express.com/pe/pshowdetl.cfm?PartNumber=255-232&DID=7

 

[nukaidee]

mm.. shipping is more expensive than the items. lol

 

[Henkjan]

what values can you get? if <5% of, I wouldn't be worried

 

[nukaidee]

i can get anything on digikey or newark.. alot of them are chokes and suppressors.. can i use those?

 

[planet10]

digikey or newark..

neither of those cater to the parts youneed for speaker level XOs.

dave

 

[chylld]

just bought the bullet and ordered a pair of alpair6 and filter components as per henkjan's diagram

can't wait for the upgrade!

 

[jemraid]

Dear Chylld,

Can't wait to find out what you think of the Alpair 6's.

Thinking about buying a pair myself.

Jem