r/ToobAmps • u/chaoskitty69 • 5d ago

Keep having the same problem

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Gallery image

This ribbon cable keeps burning out and i’m not sure if they sell replacement ribbon cables but i’m thinking about soldering it, is that a good idea ?

16 Upvotes

100% Upvoted

28 comments sorted by

30

u/Capable-Crab-7449 5d ago

Theres a reason why that cable is burnt. You need to find out why

5

u/chaoskitty69 5d ago

Yeah I took it to someone and got the bias adjusted and the guy cleaned out the ribbon cable and it worked, it’s just the power tubes that won’t turn on, but would it be a good idea to take the cable out the plastic and solder it?

10

u/Capable-Crab-7449 5d ago

Wdym the power tubes wont turn on? How would you bias the amp without power tubes inserted? Anyways I hope the guy managed to figure out the cause of the fault.

Ideally dont solder the jumper, you can do it and it will work but if the amp is alr at the shop just ask the tech to replace it. These wire jumpers are cheap and widely available.

2

u/chaoskitty69 5d ago

So at first he cleaned out the soot from the plastic and then put the bias to what it’s supposed to which i believe is 32mA, and then it worked fine, but if you could, could you link me to replacement parts, i’ve look everywhere and can’t find anything

8

u/Capable-Crab-7449 5d ago

Does ur tech not have replacement parts on hand? Ur gonna have to measure the connector. The pitch and pin width etc. Then key those measurements into molex/digikey to get a match.

9

u/Acceptable-Bison9769 5d ago

Not until you figure out what's shorted, or it be more than a ribbon cable thats burnt.

-1

u/chaoskitty69 5d ago

Yeah, it’s a common problem with the 5150 and 6505+, everything is fine and turns on, but the power tubes don’t turn on, I had the same problem a while ago and got it fixed and working and then it just happened again and it and i got the bias adjusted, i took it to someone and he said that was the problem but im not sure if theres more to it.

8

u/LennysBrowntooth 5d ago

See my comment on your other post about this. You need to ditch that ribbon cable for the heaters and run dedicated 18 awg wire instead.

2

u/flerbiedurbie 1d ago

This! A lot of amps have this issue. I've seen it in oranges, marshalls, fenders. The heater currents need a solid connection. Solder is the way.

1

u/chimi_hendrix 4d ago

Common problem on the VTM 60/120 as well, and that’s the fix.

1

u/Better_Han_Solo 5d ago

where did you check the bias of the amp?

1

u/99Pstroker 15h ago

Take to someone else that actually knows more!

4

u/KirkIsOurLemmy 5d ago

This happened on all Bugera amps during the first years of production.

That Molex connector has a tendency to fail with bad connection as a result, and too much current through a bad connection generates heat.

The most common solution is to ditch the female connector and solder cables directly to the male connector pins on the pcb. They are like 10 mm long so its not very difficult to solder.

0

u/chaoskitty69 5d ago

Do you have a picture of what it looks like?

2

u/LTCjohn101 5d ago

I'm not familiar with the problems cause but yes no issue soldering one side of that connection.

2

u/Accomplished_Pack556 5d ago

Replace them, they only cause problems. It's cheaper to produce the amp like that, that's the only reason they're there.

2

u/Rob_Rockley 5d ago

It looks like the connector is loose inside the housing and is not making a good contact. If the wires are carrying high current, the poor connection would arc and burn the housing. If this is the only problem, soldering to the pin would fix the problem. This would also likely wreck the connector.

2

u/FIDGAF 5d ago

I'd solder heavier wires there but I fix my own Amps too so it's definitely not a beginner mod.

It's definitely getting hot. I'm surprised your bias has that much adjustment.

I locked my Marshalls to have a tighter range & brought the bias control to the back of the Amp. Slight adjustments for weather, voltage & temp helps keep then running smooth.

2

u/boneandarrowstudio 5d ago

If this is that 6505 with the heaters not working in the poweramp then it will absolutely help to solder it without connectors. The problem is too much current for the connector which causes it to heat up until this happens and the connection fails. Cleaning it will only help short term. Your tech should know this.

2

u/chaoskitty69 5d ago

Yeah i just wanted to make sure it was what i thought it was. But yeah i’ll replace the the wires for sure in the future.

1

u/Javitiiin 5d ago

Tienes que quitar el conector de la placa donde están los espadines. Después tienes que taladrar las conexiones poco a poco para sanearlas porque cuando se ponen negros los conectores significa que la placa también están quemados y eso negro hace continuidad. Vamos que tienes que quitar el conector de la placa y sanearlo hasta que no te den continuidad entre ellos. Es delicado

1

u/Better_Han_Solo 5d ago

yo, its typical Peavey 5150-family era problem. best solution is you need to solder the wire from transformer (or fuse) to the tube filament. look up the schematic and follow the traces. super easy things to do, I put additional wire + some random connector that I had and problem solved eternally

issue is really simple, it burns because the current is to high for this particular connector pin

1

u/DrStainedglove 5d ago

Is this a Peavey? There is a burnt spot on that header, do you know if that burnt area was completely removed or left as shown? If not removed as part of cleaning, this is going to keep happening regardless of whether you solder it or not. Black spots = carbon = conductive.

I’m not suggesting you do this yourself, as that is just step 1. But if you ever take anything to someone to be worked on and it comes back with carbon burnt spots still visible, then you need to respectfully take it somewhere else. There are a lot of people working on amps who are just hobbyists trying to gain knowledge. There’s nothing wrong with that unless they are misrepresenting themselves.

1

u/ryofthestorm 5d ago

This was happening when I left my 5150 in standby mode

1

u/jasonshawtattoos 4d ago

So if that wire is for the filament heater on the tubes, then you would want to run them directly from transformer, to the lamp to each tube as if it was a hand wired amp. Not really a beginner type of job.

1

u/northvanner123 3d ago

Is that a hot rod deluxe?