I made a Vox AC15 clone amp some years ago and finally got it into a cabinet last week and I have a nasty speaker distortion/rattle vibration. Would anyone recognise what the issue might be from this short clip. I’ve tried three good speakers and they all do the same so it must be the amp. The sound files are too big for here so have put them in a folder in Dropbox called Distortion problem. Thanks
https://www.dropbox.com/sh/sw1w09svquva ... xzEra?dl=0
Speaker distortion
Moderators: pompeiisneaks, Colossal
-
Stevem
- Posts: 4576
- Joined: Fri Jan 24, 2014 3:01 pm
- Location: 1/3rd the way out one of the arms of the Milkyway.
Re: Speaker distortion
Remove one output tube at a time and play.
Does the sound quality stay the same, or do you loose output totally when one of the two tubes are removed?
Does the sound quality stay the same, or do you loose output totally when one of the two tubes are removed?
When I die, I want to go like my Grandfather did, peacefully in his sleep.
Not screaming like the passengers in his car!
Cutting out a man's tongue does not mean he’s a liar, but it does show that you fear the truth he might speak about you!
Not screaming like the passengers in his car!
Cutting out a man's tongue does not mean he’s a liar, but it does show that you fear the truth he might speak about you!
-
Stevem
- Posts: 4576
- Joined: Fri Jan 24, 2014 3:01 pm
- Location: 1/3rd the way out one of the arms of the Milkyway.
Re: Speaker distortion
Mr moderator, should this string get moved to the Vox section seeing as his speaker is not the issue?
When I die, I want to go like my Grandfather did, peacefully in his sleep.
Not screaming like the passengers in his car!
Cutting out a man's tongue does not mean he’s a liar, but it does show that you fear the truth he might speak about you!
Not screaming like the passengers in his car!
Cutting out a man's tongue does not mean he’s a liar, but it does show that you fear the truth he might speak about you!
Re: Speaker distortion
Thank you for your reply. I have located half of the problem, unused (not anchored) captive nuts for the rattle and fizz and I think the squeal is to do with the variable voltage regulator I put in. If I don’t max out the volume it does not do it.
You do not have the required permissions to view the files attached to this post.
-
Stevem
- Posts: 4576
- Joined: Fri Jan 24, 2014 3:01 pm
- Location: 1/3rd the way out one of the arms of the Milkyway.
Re: Speaker distortion
That's a small chassis if it's like a original one to try and implement a power scaling circuit if that's what your referring to?
You may need to work up a copper shield.
You may need to work up a copper shield.
When I die, I want to go like my Grandfather did, peacefully in his sleep.
Not screaming like the passengers in his car!
Cutting out a man's tongue does not mean he’s a liar, but it does show that you fear the truth he might speak about you!
Not screaming like the passengers in his car!
Cutting out a man's tongue does not mean he’s a liar, but it does show that you fear the truth he might speak about you!
-
pompeiisneaks
- Site Admin
- Posts: 4222
- Joined: Sat Jan 14, 2017 4:36 pm
- Location: Washington State, USA
- Contact:
Re: Speaker distortion
Can you tell me a bit more about this please. I added a variable voltage regulator which lowers the b+. It is effective for lower volume distortion but I suspect it’s the cause of the squealing when I have the volume on full (VVR not being used). I have used an authentic reproduction of the AC15 chassis. I wonder if I should take that out as I don’t hear the ‘chime’ either.
You do not have the required permissions to view the files attached to this post.