DCAudioDIY.com

DC Area Audio DIYer's Community
It is currently April 16th, 2024, 3:44 pm

View unanswered posts | View active topics


Board index » DCAudioDIY Main » General Discussion

All times are UTC - 5 hours [ DST ]



Post new topic Reply to topic  Page 3 of 4
  [ 37 posts ]  Go to page Previous  1, 2, 3, 4  Next
  Print view Previous topic | Next topic 
Author Message
TubeDriver
PostPosted: August 2nd, 2013, 7:14 pm 
Offline

Joined: March 12th, 2013, 11:12 am
Posts: 738
bigthinker wrote:
I appreciate all the response to this post. I do not have a lot of experience but I do own an Ohm meter, so I can respond to some of your recommendations. I was thinking it was the mains transformer. If someone knows of a reputable place to get them repaired or knows for certain how to repair this, please let me know.

Again, thanks for all the positive suggestions and thoughts on this problem.



If, and I repeat if it is the PT, you should just get replacement PT. but two separate PT don't just fail unless you had a lightning strike or something like that.
Top
 Profile  
 
Don Diego
PostPosted: August 2nd, 2013, 7:16 pm 
Offline

Joined: April 11th, 2013, 3:17 pm
Posts: 66
ASL is the poster boy for what's wrong with Chinese electronic gear. They sound great and are affordable but construction, variability between units and reliability leave a lot to be desired. It's a quick search on the web to find a host of problems with ASL amps from respected audio reviewers to end users.

I would love to hear your amps once you get them fixed. Good luck.
Top
 Profile  
 
Roscoe Primrose
PostPosted: August 12th, 2013, 9:53 am 
Offline
Site Admin
User avatar

Joined: February 28th, 2013, 10:38 am
Posts: 1685
I've got the ASL amps at this point. 845 supply HV rectifiers in one amp, driver supply HV rectifiers in the other... Sure looks like a power hit at this point... Plan is to replace the rectifiers for both supplies in both amps, when we should be as good as (or better) than new.

Will keep you updated.

Roscoe

_________________
I can explain it to you, but I can’t understand it for you.
Top
 Profile  
 
Guy
PostPosted: August 23rd, 2013, 10:43 am 
Offline

Joined: March 5th, 2013, 9:35 am
Posts: 261
Location: Highland, MD
BigThinker,
Did you get resolution to your problem yet? I haven't seen anything new in a while.

_________________
- Guy
Top
 Profile  
 
Roscoe Primrose
PostPosted: August 23rd, 2013, 1:35 pm 
Offline
Site Admin
User avatar

Joined: February 28th, 2013, 10:38 am
Posts: 1685
Power transformer insulation breakdown. Both are shorted between the two HV windings... We're working out whether to repair, or rebuild into something better :confusion-confused:

Roscoe

_________________
I can explain it to you, but I can’t understand it for you.
Top
 Profile  
 
Guy
PostPosted: August 24th, 2013, 10:11 am 
Offline

Joined: March 5th, 2013, 9:35 am
Posts: 261
Location: Highland, MD
How did you figure that out? Did you open up the transformers once you found they weren't working?

_________________
- Guy
Top
 Profile  
 
Roscoe Primrose
PostPosted: August 24th, 2013, 10:25 am 
Offline
Site Admin
User avatar

Joined: February 28th, 2013, 10:38 am
Posts: 1685
Guy wrote:
How did you figure that out? Did you open up the transformers once you found they weren't working?


With a multimeter. Only about 150ohms between the two primaries... :handgestures-thumbdown:

_________________
I can explain it to you, but I can’t understand it for you.
Top
 Profile  
 
Guy
PostPosted: August 25th, 2013, 4:19 pm 
Offline

Joined: March 5th, 2013, 9:35 am
Posts: 261
Location: Highland, MD
Got it - Grrrracias! :wave:

_________________
- Guy
Top
 Profile  
 
rock4016
PostPosted: September 5th, 2013, 7:56 am 
Offline

Joined: February 28th, 2013, 1:06 pm
Posts: 54
I'm confused :confusion-confused: , you meant there's 150 ohms between the secondaries? If that's the case, what would you expect to see? Or are you saying you have a primary to secondary short?

For example I just built an SE amp that has an unloaded B+ of about 490V. I measured 75 ohms between the secondaries when testing the power transformer that I used.
Top
 Profile  
 
Roscoe Primrose
PostPosted: September 5th, 2013, 8:58 am 
Offline
Site Admin
User avatar

Joined: February 28th, 2013, 10:38 am
Posts: 1685
rock4016 wrote:
I'm confused :confusion-confused: , you meant there's 150 ohms between the secondaries? If that's the case, what would you expect to see? Or are you saying you have a primary to secondary short?

For example I just built an SE amp that has an unloaded B+ of about 490V. I measured 75 ohms between the secondaries when testing the power transformer that I used.


If you've got less than an infinite resistance between two different secondaries (assuming they're note connected to anything else) you've got a problem. These transformers have low resistance between two different HV secondaries....

Roscoe

_________________
I can explain it to you, but I can’t understand it for you.
Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  Page 3 of 4
  [ 37 posts ]  Go to page Previous  1, 2, 3, 4  Next

Board index » DCAudioDIY Main » General Discussion

All times are UTC - 5 hours [ DST ]

Who is online

Users browsing this forum: No registered users and 17 guests

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Switch to mobile style
cron
Powered by phpBB® Forum Software © phpBB Group