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Old 30th June 2011, 06:25 PM   #1
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Default anyone modded their musical fidelity V-LPS?

I'm thinking firzt to change the op-amps, but would like to know if anyone modded this cheap but decent phono and could point me to whats more important to swap?
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Old 5th June 2012, 04:32 PM   #2
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Quote:
Originally Posted by jasonthegreat View Post
I'm thinking firzt to change the op-amps, but would like to know if anyone modded this cheap but decent phono and could point me to whats more important to swap?
Try OPA604 or LME49710. You could read below threads for more information. All the mods I have done so far had improved the sound a lot. You will see how capable is this small wonder after doing these upgrades mentioned. Also make sure to use good regulated PSU with enough juice. Wall wart doesn't do any good for this unit.

Here is my modification to the musical fidelity vlps - Page 2 - AudioKarma.org Home Audio Stereo Discussion Forums
WiredState Audio Community • View topic - Modding the MF V-LPS
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Old 12th November 2016, 04:33 PM   #3
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The Musical Fidelity power supply must be ditched.
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File Type: png MusicalFidelity_V_LPSii Power.png (32.4 KB, 63 views)
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Old 12th November 2016, 04:45 PM   #4
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The VLPS also has a 7809 regulator and a diode to prevent wrong way insertion -- this is going to hurt overload margin as you can only swing a little over 2V output. At a minimum you would like 20dB overload margin vis a vis 5mV. With gain of ~42dB @1kHz the VLPs should be able to swing an impossible 6.2V.

RIAA compliance is excellent.

Lastly, don't replace the NE5534. It's an excellent performer.
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File Type: png MusicalFidelity_V_LPSii Overload.png (37.9 KB, 51 views)
File Type: png MusicalFidelity_V_LPSii RIAA.png (38.9 KB, 51 views)
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Last edited by jackinnj; 12th November 2016 at 05:06 PM.
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Old 13th November 2016, 02:40 PM   #5
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Here's a solution -- MC pre-pre feeds into the MM stage.

1) Snip R9 and replace with an LM317L set for 10.0V. Bypass the adjust pin with 10u for low noise operation.
2) Replace electrolytics (16V) in MM stage with 35V devices.
3) Replace LM7809 with an LM317 set for 22V.
4)Power the unit with 24V.
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Old 17th November 2016, 08:29 PM   #6
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Some pictures of the MC pre-pre

THD with 500uV signal, gain is 16dB so the reference, dBrA is 3.2mV.

And the pre-pre can probably take over 4mV input before it runs into trouble. Should be able to handle most high output MC carts.
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File Type: png MusicalFidelity_V_LPSii MCFFT.png (18.3 KB, 22 views)
File Type: png MusicalFidelity_V_LPSii MCOverload.png (24.1 KB, 24 views)
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