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Sea of background noise in my CS... (Read 1212 times)
Zikks
Ex Member



Sea of background noise in my CS...
07/25/06 at 18:21:52
 
I recently purchased an SE84C-EX (an upgraded C from 2004 - equivalent to the CS, so I've been told) on audiogon.com and have noticed that there's a sea of background noise when the amp is just sitting there with the volume 1/4 of the way up.  Does anyone have any ideas as to (1) what might be causing this and (2) how I might alleviate it?

I'm currently trying out several pairs of output tubes (Ei EL84EG (Elite Gold), Russian 6P15P-EP, and Svetlana SV83), as well as a couple of rectifiers (Sovtek 5U4G and Sovtek 5Y3GT), but have not noticed any difference in noise production amongst them.

The one thing that I haven't swapped out is the input tube (a Sovtek 6992 which I'm waiting to replace with an Ei 6DJ8 Elite Gold)...and all of a sudden as I'm typing this I'm remembering an experience with noise and an offending input tube.

Maybe I just solved my own problem by talking through it, but if you guys have any other ideas please let me know.  Also, if you have any suggestions as far as tubes for this amp go, in general, let me know.

Thanks a ton for your time.
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Zikks
Ex Member



Re: Sea of background noise in my CS...
Reply #1 - 07/25/06 at 21:51:17
 
Well, guess what?  I removed the the Sovtek 6922 and turned the amp on...no sounds of the sea do I hear.  I re-installed it and back came the white noise.

I'm hoping that this means the tube is just plain old or bad, and that swapping the thing as I said I was very close to doing (I'm waiting for the EiEG to arrive in the mail) will solve the problem.

Let me know if you think otherwise.

Thanks again.
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Zikks
Ex Member



Re: Sea of background noise in my CS...
Reply #2 - 07/25/06 at 22:44:52
 
Well, after a closer "inspection," it's not the input tube at all...it's the phono pre.:

I hooked up my CD/DAC to it for the first time abuot 20 mins. ago and what to my wondering ears did appear?  A dead black background, completely devoid of noise!  Fantastic!!  So now how the heck do i solve my phono pre. issue?

It's Consonance PM-6 MM/MC pre. with a switch for MM and MC.  I guess the MC gain is relatively substantial becuase when I turn it to MM it's farely quiet, but when in MC mode it's a hiss-o-rama!

So, at this point I suppose I would like some suggestions on how to solve this issue (sheesh).

Thanks.
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Eli Duttman
Ex Member



Re: Sea of background noise in my CS...
Reply #3 - 07/25/06 at 23:58:00
 
Let's see if we can reduce the phono section noise.  I doubt that it can be totally eliminated, as that's the nature of these "beasts".  However, the white noise should be well in the backround, not "up front".

Is the Consonace tubed?  If it is, what is the tube complement?  "Rolling" varieties in that are known to be quiet rates to help.
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« Last Edit: 07/25/06 at 23:58:51 by Eli_Duttman »  
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Zikks
Ex Member



Re: Sea of background noise in my CS...
Reply #4 - 07/26/06 at 13:09:32
 
The Consonance is not tubed, so we're out of options in the "rolling" aspect.

I agree, the noise should be way in the background if at all existent.

Here are it's specs, in case they can be of any use:

CONTROL FUNCTIONS: Switch MM / MC
HARMONIC DISTORTION (for 2V RMS at output): 0.001%
INPUT IMPEDANCE: 47k ohms( MM ) , 3 ohm~800 ohm( MC )
INPUT GAIN: 40dB (MM ) / 60 dB ( MC)
OUTPUT INTERFACES: 1 group (RCA)
INPUT INTERFACES: 2 group (RCA)
GROUNDING INTERFACES: 1 group
SIGNAL/NOISE:90dB
CONSUMPTION:5watt
DIMENSIONS:200(L) x 98(W) x52(H) mm
WEIGHT: 4kg

Thanks.
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