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Old 22nd November 2012, 04:48 PM   #7731
FdW is offline FdW  Netherlands
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Found this one Rarely Asked Questions... | Analog Devices I like it
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Old 22nd November 2012, 05:10 PM   #7732
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The generator has flat top and bottom so it is the tube phono.
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Old 22nd November 2012, 05:51 PM   #7733
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Default Grounding

A few weeks ago Rcruz asked some questions about having one transformer for both power supplies of the Paradise, his main concern was ground loops and ground induce noise. For this reason I tried to create a grounding scheme that both is simple and ‘fool’-proof.

Attached is the schema that I came up with (after numerous discussions with RCruz), there is one ‘new’ idea in the schema and that is to introduce one ‘extra’ wire in the connection between the record player and the preamplifier. Conventionally a record player is connected to the preamplifier by 5 wires +L, -L, +R, -R and ground, this scheme uses 6 wires (more must be better ).

As I see it, the problem is the ground wire (in the 5 wire ‘standard’ scheme), there are 3 possibilities, the ground wire is connected to the tone arm, it is connected to the chassis or it is connected to both. In my opinion all three solutions are bad. The first leaves the chassis floating, the second leaves the tone arm floating and the third connects the chassis to the tone arm (and that includes all HF and ground induced noise that is picked up by the environment, mains cable, mains ground etc.).

The best solution seems to be to connect the chassis of both devices, the player and the preamp, to each other, but this will create ground loops via the mains ground and audio signal cabling (so it needs to be un-looped). Also the tone-arm should be connected to the ‘clean’ ground of the preamp. The schema, as attached, removes every possible ground (clean or mains) loop and at the same time removes all touch induced noises.

The schema for single transformer has been build and tested by RCruz and works as expected (total silence no hum’s). The schema for two transformers (is preferable) is even better, it makes sure that the only place where both channels are connected (zero ohm) is in the line amplifier.

Let me know what you think of it, do not hesitate to ask questions, and please report your experience if you did implement the schema.
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File Type: png Riaa and Player Ground Diagram.PNG (161.5 KB, 515 views)

Last edited by FdW; 22nd November 2012 at 05:55 PM.
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Old 22nd November 2012, 10:42 PM   #7734
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Distortion Spectrum Shape
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Old 22nd November 2012, 10:47 PM   #7735
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Mounting the PSU. It is double mono. I hope i do not run into trouble with grounding.
I still have some hours. We will drive early in the morning.
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Old 23rd November 2012, 03:46 AM   #7736
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A miracle happened, it works ! With a Siemens E188CC gold pin in the output i ran into wild oscillation, with a JJ E88CC it works just fine, strange.
Noise is not as low as my solid state designs but listening with MC ( Lyra Titan i ) is possible. Gain is ample. One channel is lower in noise then the other etc.
More to come.
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Old 23rd November 2012, 04:19 AM   #7737
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For who is interested, I have opened a group by for 11nF / 32nF Cu-TFT V-Cap custom capacitor.
I hope the group by will have enough people attending to make this possible.
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Old 23rd November 2012, 07:33 AM   #7738
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Sorry off topic
Is that a Clear Audio Compcet TT

I am looking for a TT worthy of the Paradise and that did came up as possible contender
with the Rega P9.

Joachim wuld you reccomend it and your impressions about it?
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Old 23rd November 2012, 08:19 AM   #7739
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Stefanoo is back, hello.
No, this is a Spiral Groove SG1. I am very happy with that deck.
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Old 23rd November 2012, 08:20 AM   #7740
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Spiral Groove ? Turntables
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