Swiss Physics model 5 preamp MM phono input - diyAudio
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Old 1st December 2003, 03:42 PM   #1
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Join Date: Dec 2003
Location: Hong Kong
Default Swiss Physics model 5 preamp MM phono input

Hi All,
Recently I bought a 2nd hand Swiss Physics model 5 pre-amp and find there is problem with the mm phono input.
The Swiss Physics has two phono input (MC & MM). I have tried 2 MM heads (AT140ML & Shure V15VxMR), 2 TT (Thorens TD321/SME3009R & Rega Planar 3) with Swiss Physics MM, all the combination sound poor, blur (not clear).

I try a AT-F3II mc head/Thorens TD321 with Swiss Physics mc input, it sounds bright and great. Also try AT-F3II mc head with AT660T/OCC (Transformer for MC phono cartridge) connect to Swiss Physics MM input, select AT660T to 3ohm, it also sounds bright and great.

Any idea what is going wrong with the Shure (& A140ML)/Swiss Pyhsics MM combination?
I don't have the manual for Swiss Physics and don't know if the previous owner has modified anything. Thanks in advance.

Specification of the 3 pickup:

AT140ML mm
Output voltage 5.0mV
Coil impedance 3.2kohm (1 kHz)
DC resistance 790 ohm
Coil inductance 490 mH
Load resistance 47 kohm
Load capacitance 100 ~ 200 pF

Shure V15VxMR mm
Output voltage 3 mV
DC resistance 1000 ohm
Coil inductance 425 mH
Load resistance 47 kohm
Load Capacitance 250 pF

AT-F3II mc
Output voltage 0.35mV
Coil impedance 12 ohm (1 kHz)
DC resistance 12 ohm
Coil inductance 50 uH
Load resistance 100 ohm, 200 ohm
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Old 15th January 2004, 06:31 PM   #2
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Location: Holland, The Hague
Swiss Physics was very expensive stuff. I have a Dutch magazin wth a review of a pre/power combo.
Is that all there is?
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Old 15th January 2004, 06:42 PM   #3
sreten is offline sreten  United Kingdom
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Location: Brighton UK
sounds like loading problems the MC cartridge and
transformer can deal with but the MM cartridges can't.

Do results vary with the transformer setting ?

You should be able to trace the MM input. Check input R
is not too low, should be 47K, and look for loading capacitors.

Also of interest is how the MM/MC switching is achieved.

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Old 16th January 2004, 01:34 AM   #4
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Location: Belgium

Sounds as if the previous owner has removed the MM loading R (nominally 47K) and cap (100 to 200pF) to optimize for his MC cart.

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Old 15th March 2004, 09:25 PM   #5
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Join Date: Feb 2004
Location: San Francisco, California
Hi Eric....I have a used Swiss Physics model 6A power amp and I have been unable to find any source for Manuals, schematics, spec.sheets, or any other info that I can use in repairing the unit. Do you know of any place where I can obtain any of this info? I would be greatful for a reply.
Thank you and greetings from San Francisco, California!
Besr Regards, Cole Johnson
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Old 5th April 2008, 01:51 PM   #6
soatj is offline soatj  Norway
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Default Swiss 6A

I have this power amp, and have gathered some information and data , as well as fixed the weak point related to cooling fans (and a humming instability) . But no idea of what happened to the "genius designer" del Nobile or schematic information for the amplifier. It had a absurd price in Norway, but was soon sold for 1/3 and hit the 2handmarked. Its sound quality and looks have levels then makes a change out of the question driving new JM lab Diva Utopias.

Thor O Jensen, Norway
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Old 8th April 2008, 08:19 AM   #7
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Join Date: Feb 2004
Location: San Francisco, California
Default Swiss Physics

Hi Thor.....Wow, I had forgotten that I had published this request....Thanks for the response. ANY info about this amp and I will be greatful. This was given to me after it had made a fall down a stairwell. It appears that the damage was to the wooden case, the fan control module, and one side of the power supply caps. This capacitor array cought fire when I powered it ON. I need to re-assemble it correctly this time ( and power up with a variac). Does this amp preform well when functioning? The build quality looks very good. Any leed for a schematic (or anything else)? My e-mail is
P.S. Love your name! Very few "Thor's" in San Francisco. Is he the guy with the hammer? Don't **** with Thor!
Thank you, Cole
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Old 8th April 2008, 08:48 AM   #8
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Location: At the sea front, Rotterdam or Curaçao
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Originally posted by soatj
no idea of what happened to the designer del Nobile
Mauro del Nobile has been developing loudspeakers, named his company SwissPhonics.
Delphine Bard did her MSc thesis research at SwissPhonics in 2004.
As of the beginning of this year it seems that SwissPhonics changed hands and Mr del Nobile has moved on to Swiss cow pasture retirement.
It doesn't count how one deals with winning, but how to handle a loss (© DjT)
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Old 18th April 2008, 11:28 AM   #9
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Location: Osnabrück -Germany
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Hi folks,

I got a Problem with a Swiss Physics Amp too.
It is a "Model 3" preamp. It was hit by lightning into the mains.
The power transformer and a regulationboard (a capsuled blackbox) are jammed.
So I don`t even know what voltages are supplied.

After a lot of searching I found the adress of the shop that bought up the parts and schematics of "Swiss Physics".

It is:

Mr. Trimigliozzi
Audiovision Sàrl
Route de Bussy 14, 1530 Payerne/VD
0041 0 26 660 85 15

This is in the french speaking part of switzerland.
One of the people at the shop also speaks german.

But they don`t sell any spareparts or schematics. The only oppinion is to send the amplifier to switzerland for repair.

If I only knew which voltages are generated on the regulation boards and served by the Transformer it would help a lot to fix this outstanding manufactured Amp.
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Old 18th April 2008, 01:44 PM   #10
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Location: Osnabrück -Germany

It had to be:

The only option is to send the amplifier to switzerland for repair.

Sorry for my english!!
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