rattle in my 6505+

[Briansol]

I've been noticing this off an on for a while.

Only on the red channel, i hear some rattling inside, similar to like what bass would do to a trunk in the ghetto on tight palm mutes.

I tried messing with the bass and resonance and even all the way off it's still there at any volume and it doesn't change.

It does NOT do it on the green channel, so it's not something physically vibrating nor a speaker.

Do tubes themselves rattle, and only when they are on? Not sure where to really look.

[JJ Rodriguez]

Different channel using a different tube that might be microphonic? Maybe something small rattling inside that's not loud enough to hear without it being amplified?

Try swapping tubes and see if you can get the issue to move to the green channel.

[Briansol]

i'm scared to touch the tubes. i have no idea what i'm doing.

do i need to bias them?

[JJ Rodriguez]

No need to bias preamp tubes. If it is a tube issue it would be a preamp tube since it's not all channels. You ever swap tubes on it? I would just pop the preamp tubes out, juggle them around and put them back in, see what happens, do it a couple times. Does it also happen at low volumes?

[metalheadpunk]

Is the rattling sound coming through the speakers or just something you hear happening in the head?

[JJ Rodriguez]

Good point, I assumed it was coming through the speakers since it wasn't on all channels, but re reading the OP it does make it sound like it's the actual head.

[Drew]

Those are probably the bones of your enemies who have fallen before the wrath of your godly tone.

[Briansol]

it's in the head itself, not coming out of the speakers.

[Briansol]

No need to bias preamp tubes. If it is a tube issue it would be a preamp tube since it's not all channels. You ever swap tubes on it? I would just pop the preamp tubes out, juggle them around and put them back in, see what happens, do it a couple times. Does it also happen at low volumes?

all volumes. more noticeable at louder volumes, assumingly because it shakes them more?

are the preamp tubes the small ones?

[metalheadpunk]

all volumes. more noticeable at louder volumes, assumingly because it shakes them more?

are the preamp tubes the small ones?

Yep, preamp tubes are the smaller ones. My first step would be to pop the back off and just make sure the tubes are all seated, and nothing else inside seems obviously loose.

[Tony]

i'm scared to touch the tubes. i have no idea what i'm doing.

do i need to bias them?

Tap them with a chopstick or pencil while on the red channel

[Tony]

it's in the head itself, not coming out of the speakers.

Should've Read the whole thread. Can you make a recording? It could be a retainer/shield that's come loose. Does it do it with the amp on the floor rather than a cab?

[JJ Rodriguez]

Sweet, was hoping Tony would make it over, I'll need someone to harass for amp questions

[Tony]

Sweet, was hoping Tony would make it over, I'll need someone to harass for amp questions

I couldn't resist. Also in relation to our previous conversation. Check out headfirst amplifications jake E Lee mod video on YouTube. Should give you some more specific pointers for the ie4

[Briansol]

Should've Read the whole thread. Can you make a recording? It could be a retainer/shield that's come loose. Does it do it with the amp on the floor rather than a cab?

I haven't tried it on the floor- only on top of the cab. i'll give that a go

i don't think you'll be able to hear it in a vid.