noisy sunn model t after retube

[blind_dead]

Hi i just got my sunn model t retubed and it is making alot of noise when i plug it in but dont play. It just seems a bit to noisy is this common in these amps or is there a solution for it. thanks

[mckinnon audio]

  Hi there,it sounds like maybe one of your preamp tubes could be noisey,even though it's been replaced.It might also be the pins in the sockets,they could be tarnished or loose fitting,Hope this is of some help,good luck Mel.

[stanner]

ummm...did you not plug it in before bringing it home?
sorry but thats the 1st thing i do when picking up an amp from a tech, or whoever replaced yer tubes.
s

[the_bleeding]

thats why those model t's come with a lovely thing called a hum balance. To use it, you need a plastic screwdriver. Once you get that, take off the back panel thinger. Then on the inside, there should be a tiny little hole in between the powertubes nearest you called "hum balance", take note of it. Plug in a patch cable, and let it hang, but dont let the tip touch anything or you'll get an earful. Next turn on your model t, and turn EVERYTHING to 10. It will be noisey. Now stick your plastic screwdriver into the hum balance, and turn until the noise is reduced. If this doesnt work, its your tubes.

[EdBass]

thats why those model t's come with a lovely thing called a hum balance. To use it, you need a plastic screwdriver. Once you get that, take off the back panel thinger. Then on the inside, there should be a tiny little hole in between the powertubes nearest you called "hum balance", take note of it. Plug in a patch cable, and let it hang, but dont let the tip touch anything or you'll get an earful. Next turn on your model t, and turn EVERYTHING to 10. It will be noisey. Now stick your plastic screwdriver into the hum balance, and turn until the noise is reduced. If this doesnt work, its your tubes.

I've never owned a Model T, so I'm not familiar with it's specific controls. It has a what? A "hum balance"? You don't mean "bias pot" do you?

If you are indeed referencing the bias pot, you do what with it?

[the_bleeding]

I've never owned a Model T, so I'm not familiar with it's specific controls. It has a what? A "hum balance"? You don't mean "bias pot" do you?

If you are indeed referencing the bias pot, you do what with it?

it is most definately called a hum balance, on the chassis a few inches away from the bias pot. And you do exactly what i said. Plug a cable in, turn everything to 10, and turn the hum balance until the hum goes away.

heres a picture of it
http://www.classicamplifiers.com/images/20010523_Sunn_ChassisTop.jpg

[EdBass]

Isn't that actually the bias balance between the pairs of output tubes?

[the_bleeding]

Isn't that actually the bias balance between the pairs of output tubes?

nope, its attached to the heaters strangely enough.