Peavey 5150- Effect Loop Trouble

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painkiller78

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Hi

I have Problems with my Peavey 5150 Block Letter.
When i put a Noise Gate into the Loop i get a hum noise and the Gate doesnt work. When i turn the Threshold i get a weird EQ Filter Type tone, like a Phase delete.
I tested 2 Noise Gates- ISP Decimator and Boss NS 2. Both dont work right.
Please help

Thanks
 
might want to try a battery in the pedal to eliminate a power issue or ground loop if you haven't already.

edit: I believe they use a tube buffered loop too, so might want to investigate there as well. Clean jacks, etc.

1731489873874.png

source: https://forums.peavey.com/viewtopic.php?t=43922#top
 
Last edited:
Batterie does not work .. it ried that yesterday....
Tube i will test today ans the Jacks too.

Thanks!!
 
May not help but try feeding the send to the return of another amp and see if it sounds normal. Then try the reverse, the send of another amp into the return of the 5150. But the cleaning advice and checking the tube is what I would do first too.
 
Hi
i cleaned the Jacks, they were perfect clean but i did it anyway...
I changed all the tubes and it is the same :-( But i tried a Chorus Pedal and it works great, it had a hum but it worked.
The Noise Gates dont ...
mhhhh
 
hmm, that's odd. If a chorus pedal works, the gate should too. How do you have it hooked up with the 4cm? Is it like pictured?

1731529478154.png
 
Yes i have it hooked up like in the pic ...the NS2 seeems to work but the hum is still there ....
 
so at this point, it's working to silence the guitar noise/feedback, and it just has hum? I assume from your first post, it's only doing it as well when something is used in the loop? Does it hum just by activating the loop, or does a pedal have to be in the chain? If it's only doing it with a pedal in the chain, I would have thought ground loop, but you said you tried a battery already. Starting to get stumped as well :confused:
 
Erock said:
Clean jacks!
Click to expand...
This. First, and foremost. I had 2 old 5150's that both had similar issues, and they are notorious for needing the jacks cleaned periodically. Deoxit, spray in there, and the tip of a cable, and pop it in and out multiple times, rinse, repeat.
 
napalmdeath said:
This. First, and foremost. I had 2 old 5150's that both had similar issues, and they are notorious for needing the jacks cleaned periodically. Deoxit, spray in there, and the tip of a cable, and pop it in and out multiple times, rinse, repeat.
Click to expand...
yeah, I should have bolded that part. Same experience.
 
JimAnsell said:
fwiw...make sure those fx loop jacks are clean too. dirty fx loop jacks are a classic 5150 issue for some reason.
Click to expand...
I had the same problem with my EVH 5150 el34. I cleaned the jacks Mutiple times and did not work.
I finally just run it in to front of amp. I use TC Electronics Sentry . Bummer cause I can run it into front and effects loop at the same time,it just dont work for me. :mad:
 
I've owned several 5150, but never really used the loop. I wonder if the loop is different on the 6505+? I recently, like not even 2 weeks ago, helped a friend setup a Decimator GString II with his 6505+. I sold him the amp about a year ago. It seemed dead quiet, we didn't hear anything. He was very happy. We also tried his board into his roadster, and had no issue there either. He's using an isolated power supply for his pedals, and a noise conditioner, but I don't think that would help in this case since it's only when the loop is on. You've tried a battery too, so that eliminates power. I'm going to have to ask him if he's heard it after I left, since there was some background noise at the time.
 
Try cleaning the jacks on the pedals as well. My Decimator pedal sometimes acts like this...but cleaning them solves it. I'd also try the Decimator out front. That's how I've always used mine. In the loop, it seems to shave some highs off. The NS2 I had long ago was terrible in that regard.
 
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