Problem with a Vox AD50 VT 2x12 Valvetronix

[TheOriginalIronMan]

I had a friend reset the input jack to this amp (it had came loose and fell into the head) and afterwards, we noticed that there was some weird high-pitched electronic squeal when it was clean or had the effects on. I've never encountered this before and I am afraid it may have something to do with the electronics ... I'd really like to find out that its going to be a simple fix or is a common affliction ... any suggestions?

 

[TheOriginalIronMan]

Thinking more about it and playing it some, its almost like a feedback issue ... even when I unplug my guitar (PRS SE Custom for reference) from it, it still feedbacks ... so I don't think its a guitar issue ... the power level coming out of it just isn't a fraction of what it normally is.

 

[glpg80]

send it off to manufacturer to get repaired. since your friend took apart the chassis tape, then your friend just voided the manufacturer warranty. you will have to pay out of pocket fees for the fix.

there is nothing that can be done here on the forum, if you cant fix or repair them yourself or have no idea what you are messing with in there.

and honestly i believe those are the new modeling amplifiers. if thats true, then no one has the correct soldering irons or troubleshooting skills to even mess with it. alot of times manufacturers troubleshoot to isolate what PCB board its on and replace the entire thing.

if its a true PCB board with no amplifier modeling you will save some cash.

if there is a local tech you trust to troubleshoot, then do that. but honestly you would be wasting money and time. there is no telling what the jack shorted when it fell inside the chassis if you had the amplifier on during that time, or what happened when installing/uninstalling the chassis.

good luck.

 

[TheOriginalIronMan]

Thanks for taking the time to break it down for a newbie ... most people aren't that polite and I truly appreciate it ...

 

[glpg80]

yeah like i said, good luck dude. theres a fine line in tone chasing amplifiers, and troubleshooting them. you just cant do the lather on a forum. best thing to do is resolve the issue with the manufacturer, and pray to god they dont see his re-soldering skills or any tape torn.

 

[Dale B]

yeah like i said, good luck dude. theres a fine line in tone chasing amplifiers, and troubleshooting them. you just cant do the lather on a forum. best thing to do is resolve the issue with the manufacturer, and pray to god they dont see his re-soldering skills or any tape torn.

You're hilarious!

I'm the one who actually looked at his amp. It is no longer under warranty because it has been longer than 12 months since he purchased it. Yes, I verified that on the Vox/Korg site before I looked at it the first time.

There was no soldering required to place the input jack back in the mounting hole. I didn't pull the chassis. Even if I had pulled the chassis, I wouldn't have damaged anything. I know what I'm doing. There is no PCB located behind the input jack. There is only wood from the cabinet.

Aside from all of that, I know how to solder and I repair my own amps. I can flow solder with the best of them.



Dale

 

[glpg80]

yeah like i said, good luck dude. theres a fine line in tone chasing amplifiers, and troubleshooting them. you just cant do the lather on a forum. best thing to do is resolve the issue with the manufacturer, and pray to god they dont see his re-soldering skills or any tape torn.

You're hilarious!

I'm the one who actually looked at his amp. It is no longer under warranty because it has been longer than 12 months since he purchased it. Yes, I verified that on the Vox/Korg site before I looked at it the first time.

There was no soldering required to place the input jack back in the mounting hole. I didn't pull the chassis. Even if I had pulled the chassis, I wouldn't have damaged anything. I know what I'm doing. There is no PCB located behind the input jack. There is only wood from the cabinet.

Aside from all of that, I know how to solder and I repair my own amps. I can flow solder with the best of them.



Dale

cool to know it was done properly. but i mentioned noticing the soldering skills, never mentioned it was worse than the factory

if anything its probably 20x better than the factory jobs. i know i reflowed half of my 5150 by now.

his amp is still in need of repair though. hence my reference to sending it to the manufacturer or to a local tech. i would rather recommend something truthful to help him out unless there is a vox representative on the forum also

 

[Dale B]

yeah like i said, good luck dude. theres a fine line in tone chasing amplifiers, and troubleshooting them. you just cant do the lather on a forum. best thing to do is resolve the issue with the manufacturer, and pray to god they dont see his re-soldering skills or any tape torn.

You're hilarious!

I'm the one who actually looked at his amp. It is no longer under warranty because it has been longer than 12 months since he purchased it. Yes, I verified that on the Vox/Korg site before I looked at it the first time.

There was no soldering required to place the input jack back in the mounting hole. I didn't pull the chassis. Even if I had pulled the chassis, I wouldn't have damaged anything. I know what I'm doing. There is no PCB located behind the input jack. There is only wood from the cabinet.

Aside from all of that, I know how to solder and I repair my own amps. I can flow solder with the best of them.



Dale

cool to know it was done properly. but i mentioned noticing the soldering skills, never mentioned it was worse than the factory

if anything its probably 20x better than the factory jobs. i know i reflowed half of my 5150 by now.

his amp is still in need of repair though. hence my reference to sending it to the manufacturer or to a local tech. i would rather recommend something truthful to help him out unless there is a vox representative on the forum also

No doubt!

I honestly couldn't figure it out because there isn't anything the input jack could have contacted to short anything. I did notice that it is one of those Chinese jobs.

I would've pulled the chassis this morning, but I had to leave. I've been nauseated all day long.

 

[glpg80]

yeah i find if im not 100% i wont even bother myself. too likely to make a mistake or forget something. get to feeling better though.

if it is all tubed and not SS, i would go pencil tapping and check for a loose solder joint. if it is all SS, i would get the schematics and start poking around with a volt meter to see if you could isolate the issue. other then that its all tech based troubleshooting skills and experience. at least it isnt intermedient, could be an open ground issue somewhere.

if you are the one thats helping him out all the way through then thats awsome. glad he has someone to troubleshoot it out. will save alot of time in the long run that way.

 

[TheOriginalIronMan]

I'm glad too ... Dale is a lifesaver and the most technically minded guitarist I personally know ...

It just pissed me off because as soon as all of that happened, my new PRS gave up a tone knob ... so I used a flathead to space the pot back out some to hold the knob on tight ... I hope it stays, but that all together was a lot to just piss me off.