Jump to content

WTB ATI 1502 Amplifier


Recommended Posts

Picked it up after work today. All channels work, and it sounds good. Was a little dusty, but cleaned up well.


I get about 30-45 seconds of hum through the speakers when first powered on - sounds just like a ground loop - and then it settled down and goes away. No presence of it during audio playback after that short time period, so i'll have to do some searching and see if this is normal or something I need to have looked at.

Link to comment
Share on other sites

15 hours ago, billybob said:

Had a 250 wpc Carver that did that. Always considered it the capacitors charging up. Nice!


The initial response from ATI is exactly that:




Thank you for contacting us. Sorry to hear about the problem. From your description, it appears to be old filter capacitors that are taking time to warm up (called "forming"). If the amp had previously been installed in a warm place without adequate ventilation, then the caps would have started to dry out, resulting in 30-45 seconds to properly form.

If you connect your speakers to the two amp modules farthest out from the centre of the amp, does it still take 30-45 seconds for the humming to fade away?



  • Like 2
Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Create New...