Marshall Studio JTM ST20 - buzzing sound / rattle.

[Takvor]

Hello to all. Recently I bought a Marshall Studio JTM ST20 combo version. It made a huge buzzing (rattling) sound on some frequencies. The shop said that the amp was faulty and it was replaced with a new one. The new amp is buzzing on almost all the same frequencies (notes).

Has anyone experienced the same issue?

Is this something to be expected?

Thank you in advance.

 

[LAR694]

Hello to all. Recently bought a Marshall jtm 20 combo version. It made a huge buzzing (rattling) sound at some frequencies. The shop said that the amp was faulty and it was replaced with a new one. The new amp is buzzing at almost the same frequencies (notes). Has anyone experienced the same issue? Is this something to be expected? Thanks you in advanced.

I went through exactly the same issue. I sent the first one back-second one has the same rattle/buzz. I had the store send me replacement power tubes. Replaced both power tubes and no more rattle. Good luck!

 

[scozz]

Absolutely not right, I would return that one too.

It’s the same kind of rattle, in two different Jtm combos, from the same store? Sometimes combos rattle, one of the reasons why I prefer heads.

No way you should spend that kind of money and have a rattle, return it and get the head and a cab would be my advice.

 

[LAR694]

This is what I found in mine-I reseated all tubes and replaced the power tubes. I also sent an email to Marshall including pics and a sound clip to make them aware of what I found. I suspect rough handling/shipping to be the cause.

 

[Takvor]

Absolutely not right, I would return that one too.

It’s the same kind of rattle, in two different Jtm combos, from the same store? Sometimes combos rattle, one of the reasons why I prefer heads.

No way you should spend that kind of money and have a rattle, return it and get the head and a cab would be my advice.

Thank you for your answer. Yes, it was bought and replaced from the same store.

 

[lpd]

I would venture to guess its output tubes. Replace and see if the rattle disappears!

 

[scozz]

I would venture to guess its output tubes. Replace and see if the rattle disappears!

Good thought, but before you buy new tubes, check that the current ones are seated properly.

 

[Takvor]

Checked if tubes are seated properly, changed the power tubes, but the rattling/buzzing sound is still happening.

 

[Kess]

Checked if tubes are seated properly, changed the power tubes, but the rattling/buzzing sound is still happening.

Did you ever figure this out? I have the exact issue. Replaced the power tubes and it’s still there