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In Reply to: Re: What kind of noise? posted by adjieda on August 16, 2006 at 10:37:09:
It's really hard to say, tubes can produce noise, but it shouldn't be excessive. Are your speaker very sensitive?Do you have a schematic for the pre-amp? It could be that you have too much gain in the system - what sort of power amp are you using? One of the causes of noise can be too much gain.
Cheers,
Pete
Follow Ups:
Gain huh? That makes sense. The loudness of the hiss is relative to the volume.My speakers are B&W 805s and not sensitive. My power amps are Consonance Cyber 800s. My preamp is someone else's DIY with a pair of 6SN7s with a rectifier tube, and (obviously) I am not electrically inclined.
Thanks for helping,
Cheers,
Adjie
AdjieIf the hiss increases with volume then
it's source is before the volume control.
Either you have a tube before the volume control
(which is unlikely but is done sometimes)
or either your CD or cable are producing it.
It also could be impedance mismatch
between the componants.
More system information would help.DanL
I just looked up the power amp spec. and it says 700mV is required for full output. As most CD players have a peak output of 2V plus, I would say that there is no need for a pre-amp and a good passive control is all you need.Any extra gain that the linestage provides will have to be attenuated anyway, so I would say that this is the cause of your excess noise.
Cheers,
Pete
Agree that he does not need a preamp, provided that there is a decent impedance match between the OP of his CDP and the input of his amplifier, but the fact that his amp requires only 700mV for full output does not per se explain the noise issue. In fact, it's quite the opposite; under the circumstances he must be attenuating the OP of the CDP, i.e., his preamp is probably not cranked up to anywhere near max output. Hence, any inherent noise in the preamp is relatively minimized, not enhanced, by his current set-up. One would need to know more to determine the cause.
Hi Pete,Your explanation makes a lot of sense to me. I will be looking at passive preamps from now on.
Thanks for all the help.
Cheers,
Adjie
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