Better MC Pre-Pre solution for low internal coil resistance- not only for Pearl phono - diyAudio
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Old 15th October 2009, 05:35 PM   #1
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Default Better MC Pre-Pre solution for low internal coil resistance- not only for Pearl phono

The presently MC prepre of the Pearl phono stage (configured as high input impedance common emitter line stage with input at gate of the j-FET) is the ideal choice for MC cartridges with internal coil resistance above 100 ohms. If I have a internal coil resistance arround 15 until 40 ohms (like some models of Lyra and Audio Technica) I get better results (more tight and clear so as more sonic dymanics) with line stages in common base topology like Hiragas prepre, see
Hiraga MC Preamp
or the Mark Levinson JC1 (see pdf schematic)

what could be the reason for this?
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Old 15th October 2009, 09:54 PM   #2
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Disagreed. Even with low impedance sources, the Ono/XP-15 is one of the quietest phono preamps I have had my hands on.
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Old 15th October 2009, 10:19 PM   #3
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The Hiraga circuit is a great sounding classic. Not so sure about the JC1 with the 1000uF at input.

If noise is not an issue i would take a single resistor loaded common cathode fet (or even better - a triode) instead of the Pearl arrangement.
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Old 16th October 2009, 06:02 PM   #4
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Quote:
Originally Posted by HBarske View Post
Disagreed. Even with low impedance sources, the Ono/XP-15 is one of the quietest phono preamps I have had my hands on.
You haven’t understand my question.
Additional I don’t know about the phono preamp “ONO/XP-15”
I know only the models
- “Aleph ONO”
- “X-ONO” (successor Aleph ONO)
- “XP-15” (currently available and successor for “X-ONO”)
Maybe you mean one of this models.

The Pearl Phono stage (not a commercial product)
http://www.passdiy.com/pdf/pearlphono.pdf
use as MC prepre a line stage in common emitter resp. source topology, i. e., a voltage controlled input. For me it is definitely clear, that MC prepre versions, which use a common base topology, that means current control input (unfortunately, very few commercial models), give better sonic quality by MC cartridges with low internal coil impedance (but I don’t know, why; and a possibility for configuration to both topologies it would be very helpful).
Because I haven’t schematic of all three mentioned models, I will not rule out, that one of the above Pass models use a prepre topology which use a common base topology (because one of the earlier preamp model of master developer Nelson Pass uses also a common base respective gate topology – see PDF file at bottom). Perhaps this is the reason of your statement.

The type number “ONO/XP-15” is total unknown for me – please send me a weblink about this, if it should really exist.

Last edited by tiefbassuebertr; 16th October 2009 at 06:07 PM.
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Old 16th October 2009, 06:04 PM   #5
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PDF Threshold SL-10
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Old 17th October 2009, 11:34 AM   #6
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Quote:
The Pearl Phono stage (not a commercial product)
http://www.passdiy.com/pdf/pearlphono.pdf
use as MC prepre a line stage in common emitter resp. source topology...
The Pearl is intended to be used with MM or high ouput MC cartridges, not with classical MC cartridges. Despite from the fact that the input stage is far from optimal for MCs (you are right on that one), overall gain is a little low for MCs.
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Old 1st November 2012, 10:07 PM   #7
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I am looking for commercial products in the kind from post #1.
Thank you for advices.
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Old 7th June 2013, 10:06 AM   #8
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even tube amplifiers with such topologies (GND-GRID) like that one from post #1 are present - go to the schematics from follow URL:
Teflon coupling capacitors & More No-Gain—No-Pain Tube Buffer Circuits

I know only this commercial products:

1) Audio Space Reference Two phono preamp and line stage amplifier
SoundStage! Equipment Review - Audio Space Reference Two Preamplifier (4/2008)
Audio Space Reference 2 Linestage Preamplifier | The Absolute Sound

2) Audio Research MCP33
Audio Research MCP 33 (go to post #4 for schematics)
REFERENCE COMPONENTS-MOVING COIL STEP-UP DEVICES

Who knows additional brands and models for MC step-up pre-preamps in this kind ?
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Old 7th June 2013, 07:31 PM   #9
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Didn't Nelson's preamp for Nakamichi have a common-base FET input for the MC stage?
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Old 7th June 2013, 07:49 PM   #10
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