AC15 weird electric noise

[Travis8]

Hi,

My vox ac15 make a weird noise without tubes and If i insert the tubes the noise come bigger.

Also the signal of the guitar doesnt sound and I check the basic, all look fine... some ideas?

Thanks you all

https://drive.google.com/file/d/1Z34eSeIxhBKVUNcRixGKHs7o5MULbwET/view?usp=sharing

[PRR]

It is a solid 100Hz buzz. I assume you are not in North America?

If this is self-built, it looks like an oversight in wiring the power supply.

[Travis8]

It is a solid 100Hz buzz. I assume you are not in North America?

If this is self-built, it looks like an oversight in wiring the power supply.

It´s a AC15C1 I´m in europe.

[Travis8]

I will check 5W resistors today, yesterday I check with tubes and without it, and the noise still there.

It´s weird..

[Travis8]

I try to replace 5W resistor and the noise still there.

When I pull out tubes the noise come down but when I put the power tubes the noise comes up very high.

Some ideas?

Thanks

[Travis8]

How can I check if power supply caps are ok?

thanks

[tubeswell]

Filter cap(s)

[Travis8]

Filter cap(s)

Yes I will try to changue it, some way to test it before?

Thanks..

[tubeswell]

Filter cap(s)

Yes I will try to changue it, some way to test it before?

Thanks..

If you solder-tack a suitably rated electrolytic cap in parallel with the suspect cap (observing the same polarity) and the noise goes away, there it will be.

[Travis8]

Filter cap(s)

C53 was bad