jcm 800 is buzzing again for god sake

[anitoli]

again the sound in the clip i posted at the begginign in reality it is much much worse....
so here is the sample inside of the 1960 cab....which screw should be tightened for front plate?

Play the loop, get the vibration going and tighten every single screw paying particular attention the where the noise is most prominent.

 

[bobbyvasco]

it seems to come from other side, just below the front mesh cover...is there something beyond this wood that could vibrate?

 

[Kuga]

again the sound in the clip i posted at the begginign in reality it is much much worse....
so here is the sample inside of the 1960 cab....which screw should be tightened for front plate?

Looks like some front panel screws are missing! Two from above

 

[PelliX]

it seems to come from other side, just below the front mesh cover...is there something beyond this wood that could vibrate?

The logo... ?

 

[Kuga]

Looks like some front panel screws are missing! Two from above

 

[EndGame00]

Coil rub on the speaker cone?

 

[jaallen]

Yeah, thats what I brought up above, or loose magnet.

 

[bobbyvasco]

View attachment 138670View attachment 138671

it is not my cab, it is a sample from the internet

 

[Kuga]

it is not my cab, it is a sample from the internet

Those ones are front panel screws.They are on the sides and at the bottom too. Check that they are tight.

 

[SmokeyDopey]

Have you tried what jaallen suggested with the magnet?

 

[PelliX]

it is not my cab, it is a sample from the internet

You're a piece of work, Bob - gotta give it to ya.

 

[bobbyvasco]

You're a piece of work, Bob - gotta give it to ya.

i dont have the pic of my cab opened...i just want people to mark which screw to tighten....that is it PI

 

[bobbyvasco]

Have you tried what jaallen suggested with the magnet?

i did not quite understand what he mentioned...twisting the magnet?
i put my hand on all magnets and none was vibrating...

 

[SmokeyDopey]

i did not quite understand what he mentioned...twisting the magnet?
i put my hand on all magnets and none was vibrating...

Basically pressing or pulling gently to see if a magnet has come loose from the frame as the buzzing note loops in the looper.
Careful with twisting!

 

[SmokeyDopey]

Pressing against the baffle ("front panel") seems like a good troubleshooting step too, as the note loops to see if anything at all changes.

 

[bobbyvasco]

Pressing against the baffle ("front panel") seems like a good troubleshooting step too, as the note loops to see if anything at all changes.

there is only mesh over speakers...where to press? On the cone?

 

[SmokeyDopey]

Sorry, I wasn't clear.
I meant press on the backside of the baffle. Having the back panel removed from the cab, press against different parts of the baffle to see if anything changes.

I'm not a cab or speaker expert, I'm just throwing out ideas.

 

[jaallen]

You will have to take the back off the cabinet, and actually push/pull and (very very carefully twist/pull) the magnet on the back frame of speaker, while looping the note you said shows the noise, to rule out a loose speaker magnet or rubbing voice coil. This can and does happen on speakers over time.
SmokeyDopey said it perfectly above.

 

[PelliX]

there is only mesh over speakers...where to press? On the cone?

May I, out of pure interest and for no particular reason, ask what it is you do for a living? If you don't want to give specifics something like "office job", or "medicine" would suffice.

 

[scozz]

Two Rock & Roll Classic’s!