[gary ocock]

HELP
 
I have a new 15 hrs old Little Dot MKIII amp that has a hum. If I turn the volume  down I can still hear the hum. I sent a email to Little Dot, no response yet anyone here have any suggestions?  Thanks
 
Gary

 

[HPiper]

I can tell you what they will say, "Clean the pins on the tubes", there is some stuff called 'Deoxit' that they recommend . Personally I guess I was lucky, mine has worked perfectly from day 1 for over a year now.
You can also search on youtube, somebody uploaded a video of how to do it.

 

[gary ocock]

Thanks
 
I'll get some from Radio Shack and give it a try.
 
G

 

[kramer5150]

Cool... looking forward to your results.
My earmax has always had a really low level ~60Hz hum.  its only a problem on black-silent passages.  I never thought to treat the tube sockets.

 

[gary ocock]

I think I narrowed it down to a audio tube. I discovered the hum was coming from one side (earphone). I then reversed the tube and the hum moved to the other ear. I reversed it again and it moved back to the other side. Looks like a bad tube.

 

[gary ocock]

I've been busy. It was a tube for sure as I purchased some tubes (ebay) and one pair Hytron JHY-6AK5 are working great.
 
Gary

 

[sssboa]

Hi,
 
I have hums from Little Dot MKII only with EF95 valves. I have two MKII amps and the other one is ok with the same valves (I have many valves to test with as well, when I replace with next EF95 pair it's ok at first then the humming gets back) . Also the humming almost disappears when I touch the amp and gets worse when I put my hand in the air between the valves. When I switch to EF92 humming disappears.
Thx
Andy

 

[sssboa]

Hi,
 
I have hums from Little Dot MKII only with EF95 valves. I have two MKII amps and the other one is ok with the same valves (I have many valves to test with as well, when I replace with next EF95 pair it's ok at first then the humming gets back) . Also the humming almost disappears when I touch the amp and gets worse when I put my hand in the air between the valves. When I switch to EF92 humming disappears.
Thx
Andy

 

[sssboa]

  Hi,
 
I have hums from Little Dot MKII only with EF95 valves. I have two MKII amps and the other one is ok with the same valves (I have many valves to test with as well, when I replace with next EF95 pair it's ok at first then the humming gets back) . Also the humming almost disappears when I touch the amp and gets worse when I put my hand in the air between the valves. When I switch to EF92 humming disappears.
Thx
Andy

and I think maybe it's dirty ceramic sockets, not easy to clean them though.