trinityamps.com

Trinity Amps Guitar Amp Forum
It is currently Sun Jul 21, 2019 4:57 pm

All times are UTC - 5 hours [ DST ]




Post new topic Reply to topic  [ 14 posts ] 
Author Message
 Post subject: Feedback!
PostPosted: Sat Apr 06, 2019 3:02 pm 
Offline
Novice
Novice

Joined: Sun Feb 13, 2011 9:41 pm
Posts: 86
Location: Ontario, Canada
I’m really loving the tone of my Plexi build but I’m finding this amp really likes to feedback on either channel when the volume and/or volume and gain are up past 6 or so. Is this normal? I’m using a Les Paul with unpotted SD Seth Lover pickups. My 335 with ‘57 Classics will also feedback just as much. I can control the feedback with my palm on the strings but I can hear it coming through when playing open strings. I’ve tried different preamp tubes and another pair of power tubes as well. I’ve thought about increasing the cathode resistors on V1a and v1b to 1.5K each from the current 820 ohm each to reduce some gain. Any thoughts?


Top
 Profile  
 
 Post subject: Re: Feedback!
PostPosted: Sat Apr 06, 2019 4:41 pm 
Offline
Experienced
Experienced
User avatar

Joined: Wed Aug 26, 2009 11:27 pm
Posts: 251
Location: Ontario
big room ?
small room?



distance from cab 4X12

all factors

Mine will feed back not usually on normal channel less I'm close to cab


Are you using VRM?


Top
 Profile  
 
 Post subject: Re: Feedback!
PostPosted: Sat Apr 06, 2019 8:44 pm 
Offline
Holy Ghost
Holy Ghost
User avatar

Joined: Sun Mar 13, 2005 4:10 pm
Posts: 7330
Location: Brighton, Canada
A bit extreme unless you are sitting beside it. Try 5751 in V1.

_________________
Stephen
Web: www.trinityamps.com. Facebook: facebook.com/trinityamps. Twitter: @trinityamps


Top
 Profile  
 
 Post subject: Re: Feedback!
PostPosted: Sat Apr 06, 2019 10:50 pm 
Offline
Novice
Novice

Joined: Sun Feb 13, 2011 9:41 pm
Posts: 86
Location: Ontario, Canada
No VRM. 1x12 cab in a 12’x12’ room with a 15’ cord. I’ve got a 5751 here. I’ll give that a try.


Top
 Profile  
 
 Post subject: Re: Feedback!
PostPosted: Sun Apr 07, 2019 10:45 am 
Offline
Holy Ghost
Holy Ghost
User avatar

Joined: Sun Mar 13, 2005 4:10 pm
Posts: 7330
Location: Brighton, Canada
Sometimes, but rarely if you followed the layout, the OT primary wires need to be reversed (BROWN & BLUE).
If the 5751 does not do it, then you can try that.
The 5751 will reduce the gain BTW, so you may not want that.

_________________
Stephen
Web: www.trinityamps.com. Facebook: facebook.com/trinityamps. Twitter: @trinityamps


Top
 Profile  
 
 Post subject: Re: Feedback!
PostPosted: Wed Apr 10, 2019 2:03 pm 
Offline
Novice
Novice

Joined: Sun Feb 13, 2011 9:41 pm
Posts: 86
Location: Ontario, Canada
I tried the 5751. It did raise the threshold for feedback but changed the bite of the amp. I’m learning to live with the feedback.


Top
 Profile  
 
 Post subject: Re: Feedback!
PostPosted: Thu Apr 11, 2019 7:35 am 
Offline
Holy Ghost
Holy Ghost
User avatar

Joined: Sun Mar 13, 2005 4:10 pm
Posts: 7330
Location: Brighton, Canada
You can try OT primary wires need to be reversed (BROWN & BLUE).
If the 5751 does not do it, then you can try that.

_________________
Stephen
Web: www.trinityamps.com. Facebook: facebook.com/trinityamps. Twitter: @trinityamps


Top
 Profile  
 
 Post subject: Re: Feedback!
PostPosted: Thu Apr 11, 2019 4:25 pm 
Offline
Novice
Novice

Joined: Sun Feb 13, 2011 9:41 pm
Posts: 86
Location: Ontario, Canada
coco wrote:
You can try OT primary wires need to be reversed (BROWN & BLUE).
If the 5751 does not do it, then you can try that.


Thanks Stephen, I’ll try that one day when I get ambitious enough to pull the chassis out of the cabinet. If memory serves me, I may not have left enough brown wire to reach. On the upside, I can get enough feedback to keep Pete Townshend happy! Lol!


Top
 Profile  
 
 Post subject: Re: Feedback!
PostPosted: Fri Apr 12, 2019 4:20 pm 
Offline
Novice
Novice

Joined: Sun Feb 13, 2011 9:41 pm
Posts: 86
Location: Ontario, Canada
Played the amp a bit today. It’s really just the open low E string that gives the most feedback at high volume. The other 5 strings are much more manageable. An open low E will cause it to oscillate into feedback.


Top
 Profile  
 
 Post subject: Re: Feedback!
PostPosted: Sat Apr 13, 2019 3:41 pm 
Offline
Experienced
Experienced
User avatar

Joined: Wed Aug 26, 2009 11:27 pm
Posts: 251
Location: Ontario
Before I had the VRM installed it would feed back in an 18 x12 room. back to the amp helped. or walked down the hall with a longer lead.

When i played in a much bigger basement didn't seem to have as much of a problem

im assuming your using the amp for all your gain or are you using pedals in front


Top
 Profile  
 
 Post subject: Re: Feedback!
PostPosted: Sat Apr 13, 2019 10:03 pm 
Offline
Novice
Novice

Joined: Sun Feb 13, 2011 9:41 pm
Posts: 86
Location: Ontario, Canada
sazafraz wrote:
Before I had the VRM installed it would feed back in an 18 x12 room. back to the amp helped. or walked down the hall with a longer lead.

When i played in a much bigger basement didn't seem to have as much of a problem

im assuming your using the amp for all your gain or are you using pedals in front


Yes, just using the amp for gain. Don’t get me wrong, I love how lively and responsive the amp is and the tendency to go into feedback and the ease with which it does so is part of that responsiveness; I was just wondering if anyone else was experiencing the same thing. It’s not a deal breaker by any means. My Trinity Tweed will also get a bit of feedback at high volume in the right situation but not as easily as the Plexi. The Tweed is more controllable. I have a 5751 in V1 on the Tweed and it sounds great in that circuit.


Top
 Profile  
 
 Post subject: Re: Feedback!
PostPosted: Thu Jul 18, 2019 3:50 pm 
Offline
Novice
Novice

Joined: Sun Feb 13, 2011 9:41 pm
Posts: 86
Location: Ontario, Canada
I solved my feedback issue. I bought a Boss WL-20 wireless system. I can crank the amp and by keeping some distance the feedback is gone. I literally have to stand 3 feet from the amp to bring on the feedback now. As a side note, I highly recommend the Boss wireless. No latency, crystal clear sound and no loss of tone. The range is more than enough and the freedom to wander around while playing is great. Yes, a longer lead would have accomplished the same thing but this is more fun.

Attachment:
1401CA02-3F64-4F5E-B24C-13B3DBFBA24D.jpeg
1401CA02-3F64-4F5E-B24C-13B3DBFBA24D.jpeg [ 2.2 MiB | Viewed 45 times ]


Top
 Profile  
 
 Post subject: Re: Feedback!
PostPosted: Fri Jul 19, 2019 9:00 am 
Offline
Holy Ghost
Holy Ghost
User avatar

Joined: Sun Mar 13, 2005 4:10 pm
Posts: 7330
Location: Brighton, Canada
That's cool. Expensive?

_________________
Stephen
Web: www.trinityamps.com. Facebook: facebook.com/trinityamps. Twitter: @trinityamps


Top
 Profile  
 
 Post subject: Re: Feedback!
PostPosted: Fri Jul 19, 2019 9:59 am 
Offline
Novice
Novice

Joined: Sun Feb 13, 2011 9:41 pm
Posts: 86
Location: Ontario, Canada
Expensive? Yes and no. Cheap for a wireless system and considering what people pay for stomp boxes, etc it’s reasonably priced. But compared to a $50 cable? Yes, expensive.


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 14 posts ] 

All times are UTC - 5 hours [ DST ]


Who is online

Users browsing this forum: Google [Bot] and 3 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:  
Powered by phpBB® Forum Software © phpBB Group