Go Back   Home > Forums > > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Vendor's Bazaar Commercial Vendors large & small hawking their wares

Modulus-686: 380W (4Ω); 220W (8Ω) Balanced Composite Power Amp with extremely low THD
Modulus-686: 380W (4Ω); 220W (8Ω) Balanced Composite Power Amp with extremely low THD
Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 9th August 2018, 07:44 PM   #621
Studley is offline Studley  United Kingdom
diyAudio Member
 
Join Date: Jan 2005
Location: West Riding of Yorkshire, England
Quote:
Originally Posted by tomchr View Post
Anyone going to Burning Amp? You'll find me in Siegfried Linkwitz & Nelson Pass' "LX Room". My Modulus-686 amp will be used to power a pair of LXmini+sub.

https://www.magiclx521.com/epages/17...egories%2Fnews

Tom
That's quite something Tom, an implicit seal of approval from NP. Not that I needed anyone to tell me how good your amps sound!
  Reply With Quote
Old 10th August 2018, 09:09 PM   #622
tomchr is offline tomchr  Canada
diyAudio Member
 
tomchr's Avatar
 
Join Date: Feb 2009
Location: Calgary
I certainly appreciated the nod. As I understand it, NP was considering powering the speakers with his ACA, but concluded that more power was needed. In his JFET-based LXmini XO document, he mentions that he and SL decided on 80 W as the minimum power required for the LXmini.

Tom
__________________
Modulus-686: 240W/8Ω @ <0.00025% THD. Modulus-86: 40W/8Ω @ 0.000054% THD. DG300B & Other Tube Circuits.
Neurochrome : : Audio - www.neurochrome.com - Engineering : : Done : : Right
  Reply With Quote
Old 10th August 2018, 09:11 PM   #623
HarmonicTHD is offline HarmonicTHD  Switzerland
diyAudio Member
 
Join Date: May 2017
Ha...

After finishing the two Power686 a few days back, tonight I completed the two ISSs (int. space stations;-) ). Plugged it in with my bulb protector and bingo, both are working perfectly. Tom big compliment - you just make it easy and error proof.

Today also the two 800VAs arrived and I hooked em up too for an ISS test. All good. Man those things are big and heavy:-). See some pics below of the beauties.
Attached Images
File Type: jpg 389A6EF7-9556-42FA-A88B-1709BCE4B2EB.jpg (1.02 MB, 178 views)
File Type: jpg ED188E9F-B6B1-4AD9-B412-C5BE3171BB55.jpg (1.06 MB, 178 views)
  Reply With Quote
Old 10th August 2018, 11:22 PM   #624
tomchr is offline tomchr  Canada
diyAudio Member
 
tomchr's Avatar
 
Join Date: Feb 2009
Location: Calgary
Quote:
Originally Posted by HarmonicTHD View Post
Tom big compliment - you just make it easy and error proof.
Thank you. I'm glad everything came together nicely for you.

Quote:
Originally Posted by HarmonicTHD View Post
See some pics below of the beauties.
Holy crap! That's what I call a transformer!

I love how the (probably pretty stout) primary leads look itty-bitty compared to everything else. I'm guessing it's a 230 VAC, single primary. If yes, you connect it to terminals 1 and 4 on the output of the ISS.

Tom
__________________
Modulus-686: 240W/8Ω @ <0.00025% THD. Modulus-86: 40W/8Ω @ 0.000054% THD. DG300B & Other Tube Circuits.
Neurochrome : : Audio - www.neurochrome.com - Engineering : : Done : : Right
  Reply With Quote
Old 11th August 2018, 04:38 AM   #625
HarmonicTHD is offline HarmonicTHD  Switzerland
diyAudio Member
 
Join Date: May 2017
Quote:
Originally Posted by tomchr View Post
Thank you. I'm glad everything came together nicely for you.



Holy crap! That's what I call a transformer!

I love how the (probably pretty stout) primary leads look itty-bitty compared to everything else. I'm guessing it's a 230 VAC, single primary. If yes, you connect it to terminals 1 and 4 on the output of the ISS.

Tom
Yep that’s what I thought too when I unwrapped it today - and there are two of them It is indeed a 230V single primary but thanks for the hint. I already connected it for testing.

Yes the secondaries are so unwieldy they keep the Power686 suspended in mid air once it is hooked up. I guess I need some hefty tools for final assembly.

Why the 800VA, 25V (Amplifon) you may justifiably ask. Well, the costs difference vs the 500va was some 40EUR however given the overall cost of ca. 1900 EUR for the entire project (2 monoblocks) the difference started to appear small. And of course it delivers the 16A the 686 can maximally cope with ;-) (but not my speakers yet;-)))

Wish me luck.

Last edited by HarmonicTHD; 11th August 2018 at 04:40 AM.
  Reply With Quote
Old 11th August 2018, 05:41 AM   #626
tomchr is offline tomchr  Canada
diyAudio Member
 
tomchr's Avatar
 
Join Date: Feb 2009
Location: Calgary
Quote:
Originally Posted by HarmonicTHD View Post
Yes the secondaries are so unwieldy they keep the Power686 suspended in mid air once it is hooked up. I guess I need some hefty tools for final assembly.
Heh. That reminds me of an E-I core transformer I had at one point. 24 V @ 50 A. The secondary was a copper band that was about 8x3 mm in cross section. There was no bending that.

Quote:
Originally Posted by HarmonicTHD View Post
Why the 800VA, 25V (Amplifon) you may justifiably ask. Well, the costs difference vs the 500va was some 40EUR however given the overall cost of ca. 1900 EUR for the entire project (2 monoblocks) the difference started to appear small.
Go big or go home!

Quote:
Originally Posted by HarmonicTHD View Post
And of course it delivers the 16A the 686 can maximally cope with ;-)
Actually, the MOD686 can deliver 21 A peak if your supply can keep up. It makes you wonder exactly where the line is between an amplifier and a welder.

7 A per LM3886. You probably got the 16 A figure from the current limit on the Mean Well SE-600-36 that I used for testing.

Tom
__________________
Modulus-686: 240W/8Ω @ <0.00025% THD. Modulus-86: 40W/8Ω @ 0.000054% THD. DG300B & Other Tube Circuits.
Neurochrome : : Audio - www.neurochrome.com - Engineering : : Done : : Right
  Reply With Quote
Old 11th August 2018, 09:20 PM   #627
HarmonicTHD is offline HarmonicTHD  Switzerland
diyAudio Member
 
Join Date: May 2017
Oh shoot. I should have gotten the 1000VA ;-))

Just kidding.

I incorrectly deduced the 16A from the manual- page 5, where it said ... the power supply should have between 10-16A for 4ohm operation. I guess the 16a from the 800va trafo are rms so peak should be 22a?

Either way... plenty of juice.
  Reply With Quote
Old Yesterday, 10:30 AM   #628
TioFrancotirador is offline TioFrancotirador  Poland
diyAudio Member
 
Join Date: May 2014
Location: Poland
Tom,

I see C11,C18 are rated for 16V and they are used for singal copuling between Opa1642 and Lme49724. The dac I built has transformer on the output, so no way for DC to show up. In such case could I actually short C11 and C18?

Thanks,
  Reply With Quote
Old Yesterday, 02:45 PM   #629
daansan is offline daansan
diyAudio Member
 
Join Date: Mar 2013
Has someone been able to properly test their Guardian 686’s?

When i supply 25v to the power supply connector i measure no voltage at all across R1 and R5, not even after having waited for a minute.

The weird thing is that it is consistent on both my guardian 686’s..
  Reply With Quote

Reply


Modulus-686: 380W (4&#937;); 220W (8&#937;) Balanced Composite Power Amp with extremely low THDHide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Modulus-86: Composite amplifier achieving <0.0004 % THD+N. tomchr Vendor's Bazaar 2405 13th September 2017 06:10 AM
SDTRANS384, MODULUS-86, POWER SUPPLU AND TROIDALS, Audio nirvana 8 alnico potstip Swap Meet 14 14th August 2015 01:06 PM
cabiant for Xpload 220w Hosam Subwoofers 19 12th March 2011 04:37 AM
Extremely low power and low loss transformers percy Tubes / Valves 12 23rd February 2005 10:30 AM
Extremely low power first amp problem m0rg Tubes / Valves 9 16th February 2004 11:05 PM


New To Site? Need Help?

All times are GMT. The time now is 02:46 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio
Wiki