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Post by splawndude on Jul 13, 2016 13:07:30 GMT -5
So sorry
FX Return to bypass preamp
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Post by gtrjunior on Jul 13, 2016 13:32:27 GMT -5
Gotcha...so im expecting to get some signal, just not the amount that would be present by going thru preamp section...then what else should I be looking/listening for?
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Post by splawndude on Jul 13, 2016 15:27:42 GMT -5
See if that terrible noise follows or stays in the preamp
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Post by gtrjunior on Jul 13, 2016 17:43:10 GMT -5
Question: At the 1:00 mark on your video you say 'If I unplug' the noise goes away but it is not clear to me what you are unplugging. You also say, I think, at the beginning of the video that your guitar is plugged into the Gate then EQ then effects loop? Are you plugged into the front of the amp? What I am unplugging is the cable going into the amp input. However the signal goes like this: Guitar >guitar in(on gate) -guitar out(on gate)>amp input The gate has what is called "dec in and dec out". It is essentially an fx loop in the pedal. So you put all your noisemakers between dec in and dec out including the amps preamp. In this case it runs to the eq then to the preamp and back to the pedal. I just had an idea. I'm gonna try taking the eq out of the pedals loop but still run it thru the amps loop and see what happens. I will double check the setup tomorrow. I have a rehearsal tonite to get to.
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Post by gtrjunior on Jul 13, 2016 18:54:26 GMT -5
I did swap out all of the preamp tubes with a known good one, one at a time but it didn't help at all. I plugged straight into the fx loop and it did NOT squeal. So that's still a mystery. It doesn't seem that the preamp is causing the squeal. I'm thinking I need to look at the pedals in the loop. Maybe, like I said the eq needs to not be in the gate's loop....idk
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Post by briman on Jul 13, 2016 19:51:14 GMT -5
I have the same power tubes in my 2015 QR and love them China or not! As for your squeeling problem, i would have guessed faulty pre amp tube but you have determined that's not the case. I would then examine your set up......it looks like in your video, you have something plugged into front of amp and you said your guitar is going into decim? Your gain is set where? Is decimater acting as clean boost? Maybe you have major clipping from to much gain crossing paths? I use a clean boost in front of my QR not in the loop. I suspect it's something in the way it's all connected to amp and not faulty loop. Unless you have bumped your amp around lately. Not likely your loop would just get problem out of nowhere but hey.....anything is possible.
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Post by splawndude on Jul 13, 2016 21:36:58 GMT -5
Good points Briman.
I normally would not suspect a faulty loop either but there was a recent Splawn owner who complained of going through at least 2 faulty loop PCBs.
And when I first started troubleshooting this with GTR I assumed he was going straight into the amp and had removed all pedals and such. When I get wierd things happening the first thing I do is plug the guitar straight into the amp and I remove as many other variables as possible.
I've had too many problems with Chinese tubes so I just don't trust them period.
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Post by briman on Jul 13, 2016 22:27:55 GMT -5
Yeah I don't trust Chinese tubes either. But I am amazed at how great my new QR sounds with them although I just got it and haven't heard it with other tubes in it. It sounds so good that I will only change them when it starts to sound dull. Like I mentioned in another post of GTR, I had a problem a while back with my competition where the volume was going in an out and some small popping now and then. Then one day there was a huge pop that scared the crap out of me and one of my tubes was lit up like flaming red orange! Those were new Ruby tubes and the store gave new ones no charge and told me that it happens with Ruby's occasionally since they are re-branded chinese. I had a few Ruby's before that years ago but never had that issue. It scared the crap out of me so bad that I will never use Ruby again lol.
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Post by gtrjunior on Jul 13, 2016 22:33:16 GMT -5
The decimator is only a noise gate and the Mxr is the eq pedal. But nothing is acting as a boost of any kind. The amp gain is dimed but up until now I haven't had any squealing from it. And this feedback squeal is unlike any type of gain related feedback I've ever encountered. I was thinking that possibly taking the eq out of the decimator's loop may help. Maybe, like you said there's some sort of signal crossover. I haven't bumped the amp in any way. It's basically been sitting right where you see it in the video for weeks now. I really hope it's just user error and not a problem with the amp. Hopefully I'll find some time to remove everything and re-assemble one piece at a time so I can test and see what's causing the problem. It's frustrating as hell...
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Post by gtrjunior on Jul 13, 2016 22:35:37 GMT -5
Yeah I don't trust Chinese tubes either. But I am amazed at how great my new QR sounds with them although I just got it and haven't heard it with other tubes in it. It sounds so good that I will only change them when it starts to sound dull. Like I mentioned in another post of GTR, I had a problem a while back with my competition where the volume was going in an out and some small popping now and then. Then one day there was a huge pop that scared the crap out of me and one of my tubes was lit up like flaming red orange! Those were new Ruby tubes and the store gave new ones no charge and told me that it happens with Ruby's occasionally since they are re-branded chinese. I had a few Ruby's before that years ago but never had that issue. It scared the crap out of me so bad that I will never use Ruby again lol. I have my bias probe being delivered tomorrow so it's just a matter of time before I can swap some new tubes in there...hopefully that is causing the volume fluctuations. Everything I've read online points to power tubes so....
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Post by briman on Jul 13, 2016 22:36:07 GMT -5
I hope it's not his loop....... that will be a pain in the you know what shipping back and fourth to Scott plus waiting... Hopefully it's just something goofy like plugging something in the wrong spot. Lol sometimes when I am trying different pedal board or loop pedal sequence or different cabinet or something,..... I forget to plug the cable to front of amp again and turn stanby off and nothing.....Then rack my head looking at loop and connections etc and then finally notice I didn't plug back into front of amp lol
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Post by gtrjunior on Jul 13, 2016 22:38:37 GMT -5
I hope it's not his loop....... that will be a pain in the you know what shipping back and fourth to Scott plus waiting... Hopefully it's just something goofy like plugging something in the wrong spot. Lol sometimes when I am trying different pedal board or loop pedal sequence or different cabinet or something,..... I forget to plug the cable to front of amp again and turn stanby off and nothing.....Then rack my head looking at loop and connections etc and then finally notice I didn't plug back into front of amp lol I'm hoping it something I'm doing too(or not doing)...lol
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Post by briman on Jul 13, 2016 22:42:14 GMT -5
oh... I thought a decimator pedal was a distortion pedal. My bad. I have my noise gate in the tail end at the front of my amp. Did you try it in front? I can imagine how frustrated you must be. Been there with problems like this........I can't sleep well until I get it figured out lol.
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Post by gtrjunior on Jul 13, 2016 22:50:13 GMT -5
If I had a dirt pedal in front of the amp I would put it there too but when using the amps distortion, if you want to get rid of the preamp hiss you hafta put it in the loop
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Post by splawndude on Jul 13, 2016 23:21:44 GMT -5
I've done some pretty dumb things in my time. Once I plugged my speaker cabinet into the the FX return by mistake. And wondered why I had no sound. Your average amp probably would have melted right then and there. (If I had new power tubes lying around I would not hesitate to put them in as a test - you will not hurt your amp) PS: The EQ pedal can definitely act as a boost - especially if you have any level above '0'. I would just remove those pedals for now until you get this sorted.
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