Little Dot MKIII Buzzing Issue

[Noobzor]

For all of you that have the MKIII, im curious if anyone has a buzzing issue in either channel.

I have a right channel buzz issue, ive swapped tubes side to side, and i have a box of new ones that do the same. Ive swapped power cords with other electronics that use the same type. Ive hooked it into a diffrent outlet other then my backup psu.

My setup consists of a Behringer 24/96 ultra curve pro digital eq that i use its internal DAC. I use the XLR out to RCA into the MKIII . I had my micro tube connected to this and i did not have an issue.

The buzz is present at all volumes, loud or quiet. If i have some calm music on i can somewhat hear it, but i usualy only hear it when there is a pause or quiet music.

thanks

 

[Negatron]

Quote:

Originally Posted by Noobzor /img/forum/go_quote.gif For all of you that have the MKIII, im curious if anyone has a buzzing issue in either channel. I have a right channel buzz issue, ive swapped tubes side to side, and i have a box of new ones that do the same. Ive swapped power cords with other electronics that use the same type. Ive hooked it into a diffrent outlet other then my backup psu. My setup consists of a Behringer 24/96 ultra curve pro digital eq that i use its internal DAC. I use the XLR out to RCA into the MKIII . I had my micro tube connected to this and i did not have an issue. The buzz is present at all volumes, loud or quiet. If i have some calm music on i can somewhat hear it, but i usualy only hear it when there is a pause or quiet music. thanks

There have been a number of early noise issues with the LD MKIII's that have been simply resolved with cleaning of the pins on the tubes. Since you have swapped numerous tubes that becomes less likely. Before anything else, to rule out tube connection, you would be well served to treat the pins and sockets of the tubes, especially the input tubes with Caig Products Deoxit. I don't know where you are, if in the US Radio Shack carries it. But it is highly recomended for any tube gear.

The use of Deoxit may well solve the problem in the event of a contaminated socket. In the event the grid pin has poor contact all sorts of noise can occur. If that does not solve the problem, David of Little Dot provides excelent service. His emai is little.tube@gmail.com. One more thing. You neglected to mention if you had swapped input interconnects right to left to rule out input as a problen

 

[Alexander1]

Do check out the Little Tube forums... there was a post about this in the FAQ recently and it may have your answer (I can't recall).

 

[Alexander1]

Sorry, double post

 

[Negatron]

Another possibility is picking up 120 cycle from other power supplies in the chain of gear you have hooked up. Sometimes reversing the power cord in the socket solves it, but wait, That fat little brass pin on the plug

forbids that. Be very carefull you don't bend it at a right angle with pliers or it may fall off.

It is there to protect you against a power transformer or other short of high voltage (220v) to the chassis. All of mine fell off by mistake. (dead silent system)