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Dark Voice 339 - Page 119

post #1771 of 2364
It's semi remote cut off tube. You may try it but it's not linear like 6sj7.

I have some 6k7g on order to try and they are variable Mu ie remote cut off just because they were beautifully and cheap. I will comments on sound when I have them and that i have the adapter made. But I fear they are not made for music reproduction!

So I need to hide my "light bulbs" to my dear lady friend:
"Light bulbs? What is it for?"
"It's for music reproduction, it is vintage stuff!"
"I really don't understand..."
"Don't worry, it's not expensive at all, it's very old!"



Sad thing is that I have more coming my way!
Edited by telecaster - 4/5/13 at 12:56pm
post #1772 of 2364

Hi all,

 

Using stock everything, not connecting to any DAC, plugged in a pair of sensitive phones, volume at zero the amp is able to pick up some noises. It's not hum.

 

Swap to my He-500 ( not so sensitve ), the noise is negligible. 

 

I even use another power distributor from a separate socket with only the 2 power cables of the 339 plugged to it but the outcome is still the same.

 

Thanks.

 

 

Is this phenomena normal or is it the lousy stock tubes ( microphonics <-- clueless about this "noise" )?


Edited by snip3r77 - 4/7/13 at 1:50am
post #1773 of 2364

Some tubes need to work for a period of time, thermal noise will slowly disappear.

post #1774 of 2364
Quote:
Originally Posted by snip3r77 View Post

Hi all,

 

Using stock everything, not connecting to any DAC, plugged in a pair of sensitive phones, volume at zero the amp is able to pick up some noises. It's not hum.

 

Swap to my He-500 ( not so sensitve ), the noise is negligible. 

 

I even use another power distributor from a separate socket with only the 2 power cables of the 339 plugged to it but the outcome is still the same.

 

Thanks.

 

 

Is this phenomena normal or is it the lousy stock tubes ( microphonics <-- clueless about this "noise" )?

Very common with new tubes.  They will need time to settle and quiet down.

post #1775 of 2364
Quote:
Originally Posted by xmdkq View Post

Some tubes need to work for a period of time, thermal noise will slowly disappear.
Hi
Pls advise if this is a defective unit or the tubes are defective. If it's thermal noise how long will it go away?

I have some NOS tubes coming next weekend hopefully and hope that it goes away.

Else I don't know what to do.

Thanks bro
post #1776 of 2364
Quote:
Originally Posted by snip3r77 View Post

Hi all,

Using stock everything, not connecting to any DAC, plugged in a pair of sensitive phones, volume at zero the amp is able to pick up some noises. It's not hum.

Swap to my He-500 ( not so sensitve ), the noise is negligible. 

I even use another power distributor from a separate socket with only the 2 power cables of the 339 plugged to it but the outcome is still the same.


Thanks.


Is this phenomena normal or is it the lousy stock tubes ( microphonics <-- clueless about this "noise" )?

My 337 works best powered directly from the wall socket..somehow i have a feelingthe sound is more full..maybe because i have also upgraded powercords? So its better heard if the ampis perfectly powered? idont know for sure..but i think The 339 wont be different..i also found out thatthe amp itself is very senstive to vibrations..when tapping on the table/rack u on which its on u can hear it in ur phones..i solved that with in-expensive herbies audio labs tender foot..now i dont hear the taps in my ears anymore...genious! and somhow..when u touch the amp..it feels heavier..more sturdy..but that last thing can be in my head also..lolz..but this is a bit offtopic..

Ontopic...yes some tubes can be noisy at first..give it 100hours to burn in..the hum should get less and eventually disapear.

but i as far i know i never heard that the standard tubes hum..maybe ur the first one..
post #1777 of 2364
Quote:
Originally Posted by hifimanrookie View Post


My 337 works best powered directly from the wall socket..somehow i have a feelingthe sound is more full..maybe because i have also upgraded powercords? So its better heard if the ampis perfectly powered? idont know for sure..but i think The 339 wont be different..i also found out thatthe amp itself is very senstive to vibrations..when tapping on the table/rack u on which its on u can hear it in ur phones..i solved that with in-expensive herbies audio labs tender foot..now i dont hear the taps in my ears anymore...genious! and somhow..when u touch the amp..it feels heavier..more sturdy..but that last thing can be in my head also..lolz..but this is a bit offtopic..

Ontopic...yes some tubes can be noisy at first..give it 100hours to burn in..the hum should get less and eventually disapear.

but i as far i know i never heard that the standard tubes hum..maybe ur the first one..

So you don't use any kind of surge protection or power conditioning?  I never would have thought it affects the sound. Each channel is individually fused, so what the worst that could happen?

I run mine with a furman rack conditioner, do you think I should remove it?

post #1778 of 2364
Quote:
Originally Posted by snip3r77 View Post

Hi all,

 

Using stock everything, not connecting to any DAC, plugged in a pair of sensitive phones, volume at zero the amp is able to pick up some noises. It's not hum.

 

Swap to my He-500 ( not so sensitve ), the noise is negligible. 

 

I even use another power distributor from a separate socket with only the 2 power cables of the 339 plugged to it but the outcome is still the same.

 

Thanks.

 

 

Is this phenomena normal or is it the lousy stock tubes ( microphonics <-- clueless about this "noise" )?

Running the amp inputs(RCA) not loaded with the next stage(source) is very likely that your amp picking up some noise....even radio waves. Is the noise still appears with the connected DAC?

post #1779 of 2364
Quote:
Originally Posted by kramer5150 View Post

So you don't use any kind of surge protection or power conditioning?  I never would have thought it affects the sound. Each channel is individually fused, so what the worst that could happen?
I run mine with a furman rack conditioner, do you think I should remove it?

Nope..nothing..u can see it on my pics in my profile here on headfi..its straight to the wall..the previous owner told me that was best way to sound best....and he is a tube amp modder for eons..so i trust him...i would advice...try it out..u have nothing to loose..especially check the lower octaves and the breathing around the music..
And when u do switch off the amp..wait a few minutes to turn it back back on..that was another advice he gave me..
Another tip...if u do connect the amp directly to the wall..be carefull with lightling outside around the house...but i guess thats normal thinking? biggrin.gif
post #1780 of 2364
Quote:
Originally Posted by WALL-E View Post

Running the amp inputs(RCA) not loaded with the next stage(source) is very likely that your amp picking up some noise....even radio waves. Is the noise still appears with the connected DAC?

Yeah the noise is still there(same) when the source is loaded. High db phones are more apparent, HE-500 is still very bearable.

Sigh I just hope is the ****ty tubes ( that's the easiest thing to do as my NOS will be coming pretty soon ).

 

Do you think the amp has any issues with grounding?

post #1781 of 2364

I met small tubes need to work around 100-200 hours can be eliminated.

post #1782 of 2364
Quote:
Originally Posted by xmdkq View Post

I met small tubes need to work around 100-200 hours can be eliminated.

Hi bro xmdkq,

So you were saying these noise are normal and it's more like tube problem rather than the amp hardware and it needs >100hrs to calm it down?
I have some NOS coming in, do you think it should have any help?

Thanks.
post #1783 of 2364
.
Edited by snip3r77 - 4/7/13 at 8:10pm
post #1784 of 2364

.

post #1785 of 2364
I've dealt with vacuumtubes.com and they are really helpful. Especially to novices when I started out.
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