Mills wire vs. ceramic power resistors - Page 3

Face · 9th November 2009, 12:45 PM

Quote:

Originally Posted by Curly Woods

Are they really that good Face? I was curious about them, but their cost has stopped me from thinking about using them in my next speaker project Ekta GrandeScanSpeak 18W/. I hope to start building the cabinets very shortly.

IMO, yes they are. Just make sure you voice the speaker with a cheaper resistor so you don't end up with multiple pairs like me.

Quote:

Originally Posted by ro9397

Ekta GrandeScanSpeak 18W/

Curly I would sure love to see, hear & touch the above project when completed! It's a jewel. Finish?

Ditto your question to Face about the Dueland vs. Mills...Recommended source for the Dueland resistors delivered to Utah? I'd consider them for the tweeter pads.

Again, thanks one & all for thoughful & considerate contributions.

Partsconnexion has them.

Joachim Gerhard · 10th November 2009, 06:37 PM

The Duelund have a negative temperature coefficient. The idea is to compensate for heating of the tweeter voicecoil. So they are more recommended for dome tweeters.
I may not use them on ribbon tweeters for example.

ro9397 · 18th November 2009, 07:07 PM

Three speakers are being built for a Trinaural system. Needed are three .82mH "litzwire" air core coils, Mundorf or Intertechnik brand, as recommended by our wonderful contributor Joachim Gerhard.

Unfortunately I find no mention of the word "litzwire" at the coil pages of Mundorf and/or Intertechnik sites:
Mundorf & Glasshouse inductors & coils page
Lautsprecher Shop Intertechnik - Cross-over electronic parts ::

Would greatly appreciate any light shed on this dillema.

Face · 19th November 2009, 12:41 AM

Scroll down, Solen has Litz Inductors: Solen Electronique Inc.

ro9397 · 06:52 PM

Joachim
How might you compare the audio performance of these Solen Hepta-litz coils vs. your preferred Mudorf and/or Intertechnik? All appear to be similar litz-wire air-core construction.

Solen vendor is in N. America whereas Mundor and Intertechnik must ship from your side of the pond.

tinitus · 25th April 2011, 02:28 AM

anyone measured resistor induction

I have, for the first time
surpriced to see it was quite a lot
around 0.03mH for a simple 'cement' wirewound
also surpriced to find that some 'cement' were almost twice of that
but seems like it varies between 0.025 to 0.055

and surpricingly, a couple of film resistors were among the worst of them

jackinnj · 25th April 2011, 02:55 AM

Here are some impedance tests I did a while back:

speakerdoctor · 25th April 2011, 01:19 PM

Based on what I see in your posted measurements of the 3 resistors, there probably isn't much variation in the all important 1-30K range. I don't see much value in the measurements above 30K.

Conrad Hoffman · 25th April 2011, 02:05 PM

Jackinnj- I gotta ask, do you get a flat line with a carbon comp? The low frequency change is more than I'd expect, and all the charts are disturbingly similar.

CH

jackinnj · 25th April 2011, 02:29 PM

Conrad: Here's the utility I used for the measurement -- the effect of cable impedances and input impedance for the analyzer are nulled out:
AP High Performance Audio Analyzer & Audio Test Instruments : Home

I do have an ESI bridge...

18th November 2009, 07:07 PM	#23
ro9397 diyAudio Member Join Date: Jan 2007 Location: No. Utah	Three speakers are being built for a Trinaural system. Needed are three .82mH "litzwire" air core coils, Mundorf or Intertechnik brand, as recommended by our wonderful contributor Joachim Gerhard. Unfortunately I find no mention of the word "litzwire" at the coil pages of Mundorf and/or Intertechnik sites: Mundorf & Glasshouse inductors & coils page Lautsprecher Shop Intertechnik - Cross-over electronic parts :: Would greatly appreciate any light shed on this dillema. __________________ Jimbo "Television is the poor man's whiskey." Russel Baker

19th November 2009, 12:41 AM	#24
Face diyAudio Member Join Date: May 2007	Scroll down, Solen has Litz Inductors: Solen Electronique Inc. __________________ "If it measures good and sounds bad, -- it is bad. If it sounds good and measures bad, -- you've measured the wrong thing." Daniel R. von Recklinghausen

20th November 2009, 06:50 PM	#25
ro9397 diyAudio Member Join Date: Jan 2007 Location: No. Utah	Joachim How might you compare the audio performance of these Solen Hepta-litz coils vs. your preferred Mudorf and/or Intertechnik? All appear to be similar litz-wire air-core construction. Solen vendor is in N. America whereas Mundor and Intertechnik must ship from your side of the pond. __________________ Jimbo "Television is the poor man's whiskey." Russel Baker Last edited by ro9397; 20th November 2009 at 06:52 PM.

25th April 2011, 02:05 PM	#29
Conrad Hoffman diyAudio Member Join Date: Mar 2007 Location: Canandaigua, NY USA	Jackinnj- I gotta ask, do you get a flat line with a carbon comp? The low frequency change is more than I'd expect, and all the charts are disturbingly similar. CH __________________ I used to be an audiophool like you but then I took an arrow to the knee.

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10th November 2009, 06:37 PM	#22
Joachim Gerhard diyAudio Member Join Date: Mar 2009	The Duelund have a negative temperature coefficient. The idea is to compensate for heating of the tweeter voicecoil. So they are more recommended for dome tweeters. I may not use them on ribbon tweeters for example.

25th April 2011, 02:28 AM	#26
tinitus diyAudio Moderator Join Date: Nov 2005	anyone measured resistor induction I have, for the first time surpriced to see it was quite a lot around 0.03mH for a simple 'cement' wirewound also surpriced to find that some 'cement' were almost twice of that but seems like it varies between 0.025 to 0.055 and surpricingly, a couple of film resistors were among the worst of them

25th April 2011, 02:55 AM	#27
jackinnj diyAudio Member Join Date: Apr 2002 Location: Llanddewi Brefi, NJ	Here are some impedance tests I did a while back:

25th April 2011, 01:19 PM	#28
speakerdoctor diyAudio Member Join Date: Sep 2006 Location: New England	Based on what I see in your posted measurements of the 3 resistors, there probably isn't much variation in the all important 1-30K range. I don't see much value in the measurements above 30K.

25th April 2011, 02:29 PM	#30
jackinnj diyAudio Member Join Date: Apr 2002 Location: Llanddewi Brefi, NJ	Conrad: Here's the utility I used for the measurement -- the effect of cable impedances and input impedance for the analyzer are nulled out: AP High Performance Audio Analyzer & Audio Test Instruments : Home I do have an ESI bridge...

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