Strain Gauge cartridge is not at all like any other cartridge. All
other cartridges, whether moving magnet, moving coil, or moving iron,
are "generators" - that is, you put motion in, and you get energy
out.....a tiny voltage that you amplify and send to your speakers. The
key here in describing all other cartridges is in the word
MOVING. All other cartridges need to move a mass around - a
magnet, and iron core with wires (moving "coil") or moving iron. They
are all magnetic generating systems, which require a mass to be
constantly moved to generate a voltage.
you move any mass, it has stored energy, just like your car when you
get it going. When you need to turn, or slow down, the mass tries to
keep you from doing so. Imagine a stylus in the groove of a record that
must make lots of changes in direction to follow the groove walls.
Imagine how the mass of the generating parts must restrain the stylus
as it tries to move.
imagine driving a car where you and the car have NO MASS. If you can,
then you can understand only one reason why the Strain Gauge is so
exciting; it has almost no "stored energy" in the moving system - there
IS no large amount of "mass" to move around - it does NOT have to move
around a magnet, or wire coils, or iron. This means that the stylus
stays in much better statistical contact with the groove walls of your
records because there is no large mass trying to keep it from doing so.
Imagine how different that sounds.
(the law by which mass tends to stay at rest or continue in the
direction in which it was moving) makes all styli "jitter" or jump
about in the groove of the record, and not stay in intimate contact
with the groove wall. If a stylus can't follow the groove wall, you
cant hear what's on the record. Its that simple.
So how does it work if it doesn't generate a voltage???
SG cartridge has two Strain Gauge elements, pieces of silicon crystal
that when compressed or expanded by tiny amounts, change resistance.
The cantilever suspension, a necessary part of any cartridge, is
coupled to these elements. The energy that is usually always "lost"
into the suspension of all cartridges is used to couple the stylus
movement and create the signal in our Strain Gauge cartridge. It is
also a purely "resistive" system, with no coils of wire to alter the
high frequency performance, or pick up hum, noise or radio stations!
Our preamp supplies it a flow of electricity, which it varies, and that
Why no RIAA required??
Strain Gauge cartridge does not use or require an RIAA playback filter
because it inherently plays the RIAA recording EQ curve used on the
record correctly. This is because the RIAA recording curve used to make
the original master recording with a magnetic cutter head COMPENSATES
for the normal cutter head velocity response
and thereby results in a groove that is basically equal
“displacement” for a signal that is swept from 20 Hz. to 20 Khz. and is
an amplitude flat (equal volume) input signal. How does that happen?
Simply. Without RIAA, the "velocity" response of the magnetic cutter
head would normally cut a large displacement groove for low
frequencies, and less displacement as the frequency rises. Using RIAA,
which LOWERS the amplitude (volume) as the frequency lowers and raises
it as the frequency increases, it "COMPENSATES" for the natural
displacement differences of a magnetic cutter head's response and
RESULTS in a basically equal displacement groove, for a flat, frequency
swept (20 to 20K) input signal. Since normal magnetic cartridges are
velocity sensitive devices (whose output is sensitive or proportional
to velocity), they need the RIAA inverse filter to result in a flat
playback response of a groove cut with an RIAA recording curve.
However, since the Strain Gauge is a DISPLACEMENT sensitive device, it
automatically produces a basically flat response from a RIAA encoded
groove, which as stated above, is a basically equal displacement
Strain Gauge cartridge is a displacement device, producing an output
that is dependent and directly proportional to the amount of
displacement of the stylus, NOT the velocity, like magnetic cartridges.
It therefore inherently plays the RIAA encoded groove correctly. If one
inspects the RIAA EQ, one will discover that there are two areas that
occur where a displacement type cartridge will deviate a small amount from a perfectly flat playback of the recorded RIAA groove, and therefore will not produce a perfectly flat response.
made in the distant past to perfectly and absolutely correct Strain
Gauge cartridges for any amplitude anomaly have required complex
equalization circuits, which add circuitry. Adding circuitry to the
signal path is strongly against our audio faith tradition. It is the
Soundsmith’s belief that human hearing is much more forgiving of
amplitude errors than time errors, so we have made the required but
absolutely minimal efforts to correct for any amplitude deviation from
absolute flatness. The result is a very flat signal that does not
deviate from the RIAA curve in an appreciable manner. We have also done
it with NO ADDITIONAL circuitry that the signal must pass through. We
believe that is the right way to do things.
it has ultra-low moving mass, and because it uses no wire coils, it has
a high frequency performance to beyond 70 Khz. Because it goes all the
way down to DC, we can use that DC information (on some models) to
display tracking forces, forces on each groove wall, record
eccentricity and "AC" component of the tracking force (record warp).
Because it does NOT have to move around a large mass, and has almost
not "stored" energy in a moving system that is required in magnetic
cartridges, it can track details that MC and MM designs simply cannot
hope to track as they suffer from the stylus "jittering" or chattering
down the groove walls due to reflected energy from the generator. The
stylus in a properly designed SG cartridge therefore stays in intimate
contact with the record groove. And because we engineered it carefully,
our Strain Gauge has user replaceable styli, a first for high end
PIEZO ELETRISK eller KERAMISK PICKUP
LYS / OPTISK PICKUP
første pickupper der aflæste signalet optisk kom fra Toshiba, Sharp og
andre. Det var tilbage i 80'erne og de virkede med en elektrisk pære
der leverede lys til en optisk film. Mekaniks var der stadig en nål i
rillen, som variede lyset internt i pickuppen. Det blev ikke lige nogen
stor succes. Teknologien var ikke rigtigt udviklet og pærer bliver
varme. Det hele gik i stykker forholdsvis hurtigt.
så her omkring 2017 skete der noget. Det japanske firma DS-Audio så
lyset - så at sige! De havde teknologien og udviklede en pickup, der
faktisk virkede. Den fik ikke den helt store mvelkomst og mange troede
det var en digital aftaster. Princippet blev dog udviklet og i dag
(2020) er der 4 pickupper i programmet, samt 4 forskellige
forstærkerbokse, som søreger for strøm og konvertering til et
liniesignal ud. Se testen samt nærmere beskrivelse af DS-E1 her:
DS-E1 LYS PICKUP