tech talk question

Long story short. 1st rehearsal with a band today and lost almost all volume when going through the pedalboard but it faded back up to full volume... several times. Swapped and removed pedals and still did it with one pedal... i had it occur when tried with two different single pedals. Even swapped all leads in the experiment.

I want to blame a power supply as the only constant. anyone ever heard of them fading in and out with volume?

could be the amp? have you retubed and rebiased this decade?

revalved for non amercans

Roland Jazz Chorus. So... no.

And it rolls fine without pedals? Like running direct to amp runs fine? Have you tried running the effects in the loop instead of in front of the amp?

Just troubleshooting here.

Neither of my guitar amps have effects loops. Direct is fine. All cables on the board were tested in a rebuild about a month ago with any that failed with a cable tester being replaced. It has been working in this exact configuration for a month (starting from the test and rebuild) in a home environment being used both through a DAW and into an amp rehearsing in lead up to this external site rehearsal. I don't want transit to be the consideration for why it failed but it SHOULD be a factor.

cable testers aren't 100%. an itnermittent problem could be temperature related. As a bad bit of copper wire retracts or expands the conenction goes wonky or a bad soldering joint is only cold in certain weather. I haven't used a cable tester in years. Tooo many false reads of itnermittent cables as good

I'm with Jim. Cable testers are essentially a money sink. If you think it's the PSU, try another one if you have access to one. If you do not, try battery power on the pedals you can battery power.

Othwerwise, take off half of all elements on the board that could be causing the issue. see if it's still having issues. If it is, take another 25% off. Rinse and repeat until you don't have the issue, then add back in one element at a time until you find the element causing it. That's the best advice I can give you on narrowing down the problem. And by elements, I mean everything. Pedals, cables, PSU. You name it, if it's on the board, and can cause any kind of electrical issues, it's an element that can be removed.

That said, a Roland Jazz Chorus with no effects loop... Must be an older amp, like, waaaaaaaaay older, because almost all the JC models I've ever used have had an effects loop. /shrug

Is '83 old enough for you? Roland Jazz Chorus 50. Mono. 12" Plugs on the back are as follows: Phones; Chorus&Vib; Distortion: Reverb (as footswitch jacks) and a Chorus&Vib out. Unless you know something secret about an amp I have owned for over 30 years, then I will stand firm on the fact it doesnt. And my other amp is a Marshall JCM800 2203 100w Lead seies head with 4x12 speaker cabinet. It is a vertical input model that i recall tracing back to an '83 also. Similarly, it does not have an effects loop.

The stripdown has to be my next option. Find what is causing the fault.

Thank you for your help guys.

That said, a Roland Jazz Chorus with no effects loop... Must be an older amp, like, waaaaaaaaay older, because almost all the JC models I've ever used have had an effects loop. /shrug

the mono one didn't have an effects loop and if I'm not mistaken the earliest 120s didn't either but this was soon added

do I have to say it? You know me, Terry. If your pedalboard is intermittent and its daunting to track the problem down perhaps your board is too elaborate.

Seriously though, you also have some older buffered bypass pedals, are the jacks well tensioned and clean, one bad pedal in or out and the whole thing is down. And you went solderless cables and said they didn't work and went back to your old cheapies. Maybe solerless was fine but you have loose jacks with dirt or rust on them?

Is '83 old enough for you? Roland Jazz Chorus 50. Mono. 12" Plugs on the back are as follows: Phones; Chorus&Vib; Distortion: Reverb (as footswitch jacks) and a Chorus&Vib out. Unless you know something secret about an amp I have owned for over 30 years, then I will stand firm on the fact it doesnt.

Dang dude, there's no need to get snippy about it. I was trying to help and troubleshoot possible issues. Won't be making that mistake with you again. Jesus H. Christ.

Taken on board. The big board is not practical. I am working on something for the troubleshoot/ rebuild.

This being said, it has worked in the studio for a long time, It traveled an hour plus for a recording session. This happened in one venue this weekend gone.

I just asked because i wanted advice on the cut off/ fade back. It was an obscure fault that i had not encountered in 35+ years of playing.

That said, a Roland Jazz Chorus with no effects loop... Must be an older amp, like, waaaaaaaaay older, because almost all the JC models I've ever used have had an effects loop. /shrug

I fail to see how this comment could have been construed as helpful.

Right. Focus on the one throw away comment that was all of a sentence long after I'd given a full paragraph of how to narrow down what the issue could be, because that one comment negates everything else about that post. Brilliant. Absolutely brilliant.

That's totally alright. Completely fine. Like I said, I know how you roll now, I won't be making the mistake of chiming in on your posts again.

Have a good one. I'm out.

Can I please apologise?

I appreciate you taking the time to try and offer solutions.

I misinterpreted your use of words and the "/shrug" comment in the sentence as you doubting my knowledge of my amp. I responded too hotly.

Thank you for your suggestions. I will add them to my troubleshoot list.

I just asked because i wanted advice on the cut off/ fade back. It was an obscure fault that i had not encountered in 35+ years of playing.

thinking about its a PSU issue and if not it may actually be a bad buffered bypass... your powersupply is the most likely culrit. Bite the bullet and buy a good PSU. Voodoo Lab obviously is the msot venerable option. I gotta be honest, my pedals are run off dedicated wall warts into the isolated outs of a good furman. I enver have issues with all my pwoer conditioners, but it nescessitates racks. Of course I also have the ehad switcher, the lexicons and other stuff so I need the racks anyway. And as a synthesist and engineer I already am quite rackmount-centric. YMMV on power conditioning, ut its incredibly reliable, seldom spoken about. Not just any furman will do though, you need the right one for wall wart spacing and a it needs to be well isolated outputs so tis the upper echelon of furmans. I forget which model I use now, its banked up with some lesser ones, PL8s I think. I'm more stationary for live performance, you tube shit. So I have a furman in the synth/processor rack and then a smaller rack hiding out with just 4 furmans in it.

Right. Focus on the one throw away comment that was all of a sentence long after I'd given a full paragraph of how to narrow down what the issue could be, because that one comment negates everything else about that post. Brilliant. Absolutely brilliant.

That's totally alright. Completely fine. Like I said, I know how you roll now, I won't be making the mistake of chiming in on your posts again.

Have a good one. I'm out.

vut terry some slack, he's australian, all the poisonous animals make them defensive

I'm so used to putting a /shrug at the end of a "I'm not sure" train of thought (I use Discord nearly every day for both work and general communications, and it puts a ¯_(ツ)_/¯ when you use it) that it's second nature. No idea why it's suddenly italics and deletes text when I turn OFF italics. Silly phone.

Wasn't a questioning of your amp, was more of a "Damn. If it don't have an effects loop, that has to be an older one, or something, I don't know."

We both misinterpreted a few things, text isn't a great medium for communications. No worries, sorry I flipped shite as well.

vut terry some slack, he's australian, all the poisonous animals make them defensive

I'm Scottish, we're just down right offensive. I mean, come on, we invented GOLF. What kind of people do that? And why?

I'll tell ya: We like to see other people suffer. Have you ever met someone that actually enjoys golf? No. Oh sure, they say they do. But it's a lie. What they enjoy is getting away from responsibility, and golf gives them a way of doing that. Too bad it's a good walk ruined.

I'm Scottish, we're just down right offensive. I mean, come on, we invented GOLF. What kind of people do that? And why?

I told terry you were scottish via messenger and pointed out it a matter of time before you were at eachother's throats

and yeah, what kind of nation eats haggis and goes golfing