How loud? Only hear it with your ear pressed to the speaker and not when listening normally? Which REF PRE?
I have ref 5 pre .
the hiss is barely audible from the listening point and is independent of the volume level.
the preamp sounds very good but I wanted to know if it's normal to hear the hiss.
my previous sp9 didn't have this “issue”
the hiss is barely audible from the listening point and is independent of the volume level.
the preamp sounds very good but I wanted to know if it's normal to hear the hiss.
my previous sp9 didn't have this “issue”
I don't hear the hiss at all from listening position. Close up, a very little bit. REF 3, Ref 110, 89dB Spendors.
Cheers, S.
Cheers, S.
Steve ,
Good point
I hear hiss in both mode and even if selected not used input ( aux 2)
I have changed 6550 e 6h30 in Psu section but nothing change.
Service in Italy told me that is all normal for a tube pre . I want compare this with your experience .
Pre sound very good and hiss don’t disturb but see other comment and some doubt come
Good point
I hear hiss in both mode and even if selected not used input ( aux 2)
I have changed 6550 e 6h30 in Psu section but nothing change.
Service in Italy told me that is all normal for a tube pre . I want compare this with your experience .
Pre sound very good and hiss don’t disturb but see other comment and some doubt come
I completely re-tubed my 3 a couple of years ago. It had about 2500 hours on the original set. I didn't check the noise level specifically but nothing caught my attention in that regard.
S.
S.
I would try it with no sources attached and muted. I have seen noise come from sources that were off and their input not selected on the pre, due to ground loops. Is the noise in both channels?
Yes , hiss is on both channels and doesn’t depend from volume level
I’ll try to disconnect source
I’ll try to disconnect source
With volume at zero is not possible that the noise comes from source.
Normally the hiss is depending from tube selection.
And probably it doesn't come from tube on power supply.
The D70-2 has 0,85 V as sensitivity for max power so it is relatively high
But the gain of the 5 is 6 dB in the s.e. and 12 dB in balanced, so it is not so high
Walter
Normally the hiss is depending from tube selection.
And probably it doesn't come from tube on power supply.
The D70-2 has 0,85 V as sensitivity for max power so it is relatively high
But the gain of the 5 is 6 dB in the s.e. and 12 dB in balanced, so it is not so high
Walter
This because the out circuit in working and the mute is off
With mute on the output is normally put to ground by rele.
With mute on the output is normally put to ground by rele.
Antonio:
I finally checked the noise in my REF 3. NOT muted and full volume there is some hiss and tube roar. At half volume, which would be crazy loud and probably drive the power amp into clipping there was very, very slight hiss that could only be heard (maybe) with an ear right on the speaker. I hope this helps.
Steve
I finally checked the noise in my REF 3. NOT muted and full volume there is some hiss and tube roar. At half volume, which would be crazy loud and probably drive the power amp into clipping there was very, very slight hiss that could only be heard (maybe) with an ear right on the speaker. I hope this helps.
Steve
