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Old 9th June 2015, 03:01 PM   #1
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Default Donde está el error?

Friends, I built in phono preamp, which I have already discussed in this forum. Solidphono is published in TNT.
I respected the published circuit and component values ​​to the letter.
In tests the result was very good, which I mentioned in the forum.
I have assembled in separate cabinets, one for psu and one for the preamp, connected by shielded cable and connector 3p.
The input and output isolated from the chassis.
In the psu I have put a ground loop breaker, and the preamp I put the star masses.
E problem is that if I do not connect the turntable, the silence is total. But when I plug connectors start a HUMM turntable, with 1/4 volume since almost not audible, but to 1/2 volume and annoying and I guess "pollutes" the sound.
I show the plot of land that I have done for suggesting me wrong. Greetings and thanks. (By pure anger I'm thinking about building a Pearl II or a kit Boozhound Labs).

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Old 9th June 2015, 03:55 PM   #2
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Have you connected the ground loop breaker to PSU chassis?
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File Type: gif Ground Loop Breaker - ESP.gif (5.7 KB, 89 views)

Last edited by merlin el mago; 9th June 2015 at 03:57 PM.
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Old 9th June 2015, 04:15 PM   #3
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Yes, the ground loop breaker is in the PSU.
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Old 9th June 2015, 04:33 PM   #4
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Have you tried not connect the ground lug to phono GND?
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Old 9th June 2015, 04:35 PM   #5
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I guess phono GND isn't connected to chassis, right?
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Old 9th June 2015, 04:43 PM   #6
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Mira el diagrama adjunto, see attached image.

Asegurate que los conectores RCA no hagan contacto con el chasis, be sure RCA connectors don't contact the chassis.

El conector de masa que viene del TT tiene que tocar el chasis, ground lug coming for TT must have contact with the chassis.
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File Type: jpg HUM.jpg (330.1 KB, 89 views)

Last edited by merlin el mago; 9th June 2015 at 04:47 PM.
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Old 9th June 2015, 05:22 PM   #7
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If the breaker ground loop is connected to the chassis of the PSU that through the mesh wire shield is directed to mass leads to PRE PRE chassis.
RCA chassis are isolated.
The TT ground connector is connected to the chassis along with the rest of the mass and RCA PRE pcb.
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Old 9th June 2015, 05:24 PM   #8
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For your diagram, it is understood that the masses of pcb, rca source and should not connect to the chassis PRE ?.
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Old 9th June 2015, 05:27 PM   #9
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Quote:
Originally Posted by ALPUY View Post
For your diagram, it is understood that the masses of pcb, rca source and should not connect to the chassis PRE ?.
Right.
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Old 9th June 2015, 05:33 PM   #10
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Quote:
Originally Posted by ALPUY View Post
If the breaker ground loop is connected to the chassis of the PSU that through the mesh wire shield is directed to mass leads to PRE PRE chassis.
RCA chassis are isolated.
The TT ground connector is connected to the chassis along with the rest of the mass and RCA PRE pcb.
The connector carrying DC between PSU & PRE must be isolated from chassis. You can try the TT ground conector connected or not connected to PRE GND pcb.

Last edited by merlin el mago; 9th June 2015 at 05:37 PM.
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