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

Pass Labs This forum is dedicated to Pass Labs discussion.

Burning Amp BA-3
Burning Amp BA-3
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 29th December 2019, 02:03 AM   #2371
airborne11b is offline airborne11b  United States
diyAudio Member
 
Join Date: Jun 2019
Okay. I have been letting the amp burn in and try to reach equilibrium on the sinks. All was great until i went to go measure the bias. Soon after connecting the meter leads the transformer started buzzing. Everything otherwise seems fine. No smoke, bias still seems good, put music through it and sounds great, but there is a fairly loud hum now coming from my transformer. Which is a 600VA Antek 24x2. Any ideas? Could one/more output device be bad and draw a bunch of power but the amp still works?
  Reply With Quote
Old 29th December 2019, 02:19 AM   #2372
6L6 is offline 6L6  United States
diyAudio Moderator
 
6L6's Avatar
 
Join Date: Oct 2010
Location: Denver, Colorado
Burning Amp BA-3
Where did you place the leads?
  Reply With Quote
Old 29th December 2019, 02:26 AM   #2373
airborne11b is offline airborne11b  United States
diyAudio Member
 
Join Date: Jun 2019
They are connected on opposite ends of one of the source resistors. It still buzzes when they come off too.
  Reply With Quote
Old 29th December 2019, 03:34 AM   #2374
airborne11b is offline airborne11b  United States
diyAudio Member
 
Join Date: Jun 2019
So I unplugged the leads from the rectifiers to the power supply boards essentially removing any load from the transformer and it still hums. I’m thinking there is a mechanical error in the construction of the transformer. Maybe it was just coincidence that it started humming when i was taking readings. The music from the amp sounds fantastic, bias is steady around .3V across the source resistors. Maybe i will see if Antek will exchange it.
  Reply With Quote
Old 30th December 2019, 01:07 PM   #2375
Btsd is offline Btsd  Australia
diyAudio Member
 
Join Date: Aug 2015
Location: Perth
Had a similar experience on a duel mono LM I built. One transformer noisy, one not. At the suggestion of someone here I tightened the retaining bolt on the noisy transformer a little. It must have been vibrating a little. No more noise for two years now.
  Reply With Quote
Old 30th December 2019, 01:44 PM   #2376
airborne11b is offline airborne11b  United States
diyAudio Member
 
Join Date: Jun 2019
Quote:
Originally Posted by Btsd View Post
Had a similar experience on a duel mono LM I built. One transformer noisy, one not. At the suggestion of someone here I tightened the retaining bolt on the noisy transformer a little. It must have been vibrating a little. No more noise for two years now.


I will do this tonight. After letting the amp rest overnight Saturday night, Sunday the buzz was gone. I'm guessing the heat from leaving it on all day Saturday softened the insulation and whatever they use keep things tight, allowing some things to loosen up. I will take the added measure to tighten it up a little more.
  Reply With Quote
Old 31st December 2019, 02:48 AM   #2377
airborne11b is offline airborne11b  United States
diyAudio Member
 
Join Date: Jun 2019
Public Service Announcement: The BA-3 is absolutely incredible sounding. it is holographic, huge soundstage, dynamic, absolute black background. These properties come to mind after 20 hours of burn in and 5 or so hours of listening. I recently built F5T V3 monos which are amazing as well but i think i like the BA-3 just a tiny bit more. And it is in my secondary system.
  Reply With Quote
Old 31st December 2019, 02:49 AM   #2378
6L6 is offline 6L6  United States
diyAudio Moderator
 
6L6's Avatar
 
Join Date: Oct 2010
Location: Denver, Colorado
Burning Amp BA-3
Yes.
  Reply With Quote
Old 31st December 2019, 09:35 AM   #2379
cubicincher is offline cubicincher  Germany
diyAudio Member
 
Join Date: Mar 2016
Location: Hechingen, South of Germany
Default to airborne11 #2377

Hello airborne11,


yes, the BA-3 is a fantastic amp! This is why I built two of them.
I also have F-5 T - Monoblocks. I prefer them on my ESLs.


Both are very good sounding designs. It depends what is hanging on your amp -
what kind of loudspeaker.


And both are running hot!
Check your temperatures on the heatsinks in summer. But in the states you have -most often- aircondition in the house.



Enjoy your listening sessions with your BA-3!

Greets
Dirk
  Reply With Quote
Old 31st December 2019, 01:16 PM   #2380
airborne11b is offline airborne11b  United States
diyAudio Member
 
Join Date: Jun 2019
  Reply With Quote

Reply


Burning Amp BA-3Hide 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
Burning Amplifier BA-1 Variac Pass Labs 388 14th December 2019 09:51 PM
Burning Amplifier BA-3 Nelson Pass diyAudio.com Articles 41 6th May 2019 04:40 PM
Burning Amplifier BA-1 Nelson Pass diyAudio.com Articles 3 24th October 2011 03:53 AM
WTB: Burning Amp BA-1 or BA-2 jdubs Swap Meet 0 23rd March 2011 04:16 AM
FS: two burning amps (one each BA-1 and BA-2) without drivers Eric Weitzman Swap Meet 15 17th February 2010 03:35 AM


New To Site? Need Help?

All times are GMT. The time now is 02:57 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 14.29%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
Copyright ©1999-2020 diyAudio
Wiki