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Old 12th November 2012, 11:13 AM   #7691
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If you like you can come to the L`Art du Son room and we have a chat. Would be nice to see you.
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Old 12th November 2012, 04:14 PM   #7692
gk7 is offline gk7
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Cool, CU

For anyone who might attend the Klangbilder show too, its room 334 (third floor).

Last edited by gk7; 12th November 2012 at 04:40 PM.
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Old 12th November 2012, 05:23 PM   #7693
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Hi. I have a full set of measurements on the Paradise. Readings:
Gain: 61.4dB at 1Khz
Vout max: 30Vpk-pk
THD at 1Khz (Ref 1Vrms): 0.06%
Noise measured with HP3581A
Noise at 1Khz (input in 50 ohms, 10Hz BW): -99dBV (-92dBV in 30Hz)

Noise floor, see included picture, in red my Clio system noise floor, the white is the Paradise, input terminated in 50 ohms, no shield or enclosure, but using the pre-reg and RC-filter supply. First supply 120Hz peak at -74dBV. It will be probably lower with a separate supply enclosure, put away.

1Khz FFT spectrum. The supply noise is higher there because the preamp is connected to the CLIO system. I always have this kind of error in measurement of phono preamp. It will be lower with an actual cartridge.

RIAA Curve, see table included
Well close to text book perfect, with 0.2dB almost at all frequency. Since my signal generator is not perfectly frequency stable, neither perfectly flat in amplitude, these are pretty good results.

The Paradise has excellent measured specs. Now time to start building the enclosures...
Attached Images
File Type: jpg Noise_floor_Red-PC_Card_Wht-Preamp.jpg (119.8 KB, 185 views)
File Type: jpg 1Khz_at_0dBV.jpg (120.2 KB, 176 views)
File Type: jpg RIAA_Curve_Check.jpg (127.5 KB, 173 views)

Last edited by Algar_emi; 12th November 2012 at 05:26 PM.
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Old 12th November 2012, 05:45 PM   #7694
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Here both schematics preamp and regulator with a lots of reference voltages readings. May be useful while troubleshooting your preamp.
Attached Images
File Type: jpg Paradise R3 schematic amplifier_notes.jpg (534.4 KB, 185 views)
File Type: jpg Paradise R3 schematic regulator_notes.jpg (573.6 KB, 169 views)
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Old 12th November 2012, 05:57 PM   #7695
Salas is offline Salas  Greece
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There is discrepancy from 1.5KHz upwards between channels. What is better to mod for that? Some impedance ratios, or the 11n caps?
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Old 12th November 2012, 06:13 PM   #7696
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I would tune the caps. To get a handle on the output impedance of the mirror is harder.
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Old 12th November 2012, 06:14 PM   #7697
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Algar, i see mostly PSU harmonics. That should go down a lot when the circuit is in the cabinet plus correct shielding. Otherwise it looks good.
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Old 12th November 2012, 06:18 PM   #7698
Salas is offline Salas  Greece
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Quote:
Originally Posted by Joachim Gerhard View Post
I would tune the caps. To get a handle on the output impedance of the mirror is harder.
Open loop blues...but hands on, we like hands on.
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Old 12th November 2012, 06:20 PM   #7699
FdW is offline FdW  Netherlands
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Quote:
Originally Posted by Algar_emi View Post
Here both schematics preamp and regulator with a lots of reference voltages readings. May be useful while troubleshooting your preamp.
To PSU looks perfect to me. The preamp also (but that’s not mine to judge ) Most of the mains related peaks will be gone if the measurement equipment is disconnected, when the RAW PSU has its own box, and when the preamp has its own box. (as Joachim noted)

Last edited by FdW; 12th November 2012 at 06:30 PM.
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Old 12th November 2012, 06:49 PM   #7700
MiiB is offline MiiB  Denmark
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Algar...

you have to get rid of the hum....!! all the harmonics you see at you FFT is from the 60 Hz hum you have..

And when you measure the Paradise you need to terminate the input with a lower resistor. the 50 ohm termination has more noise than the stage in itself.

But I agree, these are a clear hint of the technical qualities of the phono-stage...Not too bad..!

Last edited by MiiB; 12th November 2012 at 06:51 PM.
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