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The 'tube-transistor' enigma by MC carts?

By accident I got to know an guy from Swizerland who has
worked for years as technician (R&D,testing,manuf.etc) by
Benz. I made some joke about 'Zelle',the expresion he used
to refer to carts,by asking if the carts are made by
prisoners? ('zelle' is 'the box' in the prison) He appreciated my joke and explaned to me in 2 sentences
something I never thought about. There are 2 kinds of
'bobins': iron and the other kind. The 'classical example'
of 'iron' is the Ortofon SPU. The advantage: stronger signal and some kind of 'pleasing warm sound.the disadvantage:(more)distortion.
The 'ruby-cross' bobin has (much?) less distortion but can
sound 'thin' depending on the rest of 'the chain'.
This is obviously the so-called 'Holistic' approach ;
aka Rauls 'it depends...'. Me? Because I can't cope with
more then 2 variables at the same time I am for 'simplicity' approch. The best 'definition' of this
approch is from O.Wilde:'I have the simplest tastes. I am
alwys satisfid with the best'. So I am still seaching.
Raul will you please bring (more) light to this issue?


Cheers
128x128nandric
bimasta's avatar
bimasta
227 posts
 
@chakster — Thanks, I think I have that text in the booklet that came with it. But a question...
" Air core coil is adopted as coil.... In addition, by adopting a new special lightweight resin coil bobbin...
It seems "core" and "bobbin" are different things. I thought both referred refer to whatever the wire is wound around, i.e. a single thing — apparently not. So now I don’t know what an "air" core is. Can someone educate me, and explain the difference between core, bobbin, armature?

@lewm — More resistance would lower the output, yes? But we’re dealing with low output anyway. Would it have any other significant effects?

nandric's avatar
nandric OP
4,086 posts
 

I was stunned to see that this was/is my own thread. From 2009!

I also had difficulty to recognize my own English.

Well the expression ''CORE-LESS''  may give the right direction

for our thoughts. ''Iron-core'' in the ''coil-former'' is used , like

by cheap inductors , to increase the cart output. As Lew put

it ''less coil wire'' is then needed reducing the moving mass.

Lukatatschek, the owner&designer by Benz , stated ''I don't like

iron'' anywhere in the signal  path and use ruby plate to wind

coils on. But his LP S (or mr.) has + 40 Ohms impedance

''suggesting'' much (more) wire. Mori san invented ''8 form

 coil-former'' for his series XL Sony MC's. Those coils are also

''core-less'' but the whole series, like Benz, has +40 Ohms

impedance ''implicating''  more wire. Ergo: those LOMC''s with

output around 0,2 mV or less are ''core-less'' with little wire

and with low impedance.

analogluvr
859 posts
 
@bimasta  it's nice to run into somebody with an FRMC201.  I have had one for a while when I picked it up on a curiosity. I absolutely love it, it is fantastic Mounted on an ET2.   It is an air core  design with I believe .17 mV output. 
nandric's avatar
nandric OP
4,086 posts
 

Addition, I don't know why exactly Lukatschek dislike ''iron''

(core) but he stated '' I don't like iron anywhere in the signal path''

(see above). I now remember his comment on Fremer's

review of his LP s. He blamed Fremer for using SUT by

his listening tests. One can see this as one more argument

against SUT's ( see Raul) but he used more wire for the

coils to get output at an ''reasonable level'' of 3.6 mV.

That is to say that one can avoid SUT's with this kind of

output.  I have no idea if SUT's can be made without iron

core . I am very fond with my Denon AU-S1 and don't

believe that this SUT uses any iron. But I also know that

''believing'' is not an strong argument.

chakster's avatar
chakster
6,144 posts
 
Last month i have opened my headamp designed by Nakatsuka-San. The reason to unscrew it was expired batteries. It was a first time when i saw input resistors like that. Those resistors looks like an MC cartridge coil and made by winding the wire to a coil that has no inductance in a special process. Those resistors made by ZYX to transfer the output signals with no noise and no inductance at all. They are made of pure coil wire of MC cartridges, cryogenically purified. Signal from LOMC cartridge should go into ZYX CPP-1 Headamp’s resistor wihtout any influences from resistor noise and inductance. Nakatsuka-San decided to use his own resistors made of pure copper wire, same material as a copper wire of MC carts. In order to playback the sound info of LOMC carts in 100% fidelity, CPP-1 headamp has special circuit in the simplest amplification circuit.

Great device to avoid SUT !
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