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A transimpedance amplifier input looks
like a virtual short to the input signal. The input voltage is
therefore zero. The input signal is the current going in/out of that
virtual short. The input current is multiplied by the gain (in Ohms) to
give an output voltage corresponding to the input current.
There are no loading options or
concerns. A current input stage (transimpedance) input is a virtual
short. That topology obviates load resistor selection. The current going
into that short is then amplified.
You are welcome to try. It is unlikely to work very well.
We expect the Phono Loco
to work very well with most MC cartridges. But there is not yet a body
of info available. We will keep a user forum page updated so experiences
can be shared.
Conventional voltage amplifiers
express gain in dB (as the ratio between the input voltage and the
output voltage). With a transimpedance amplifier, input is current and
the output is voltage. For that topology, gain is expressed in Ohms.
Gain is approximately 10k Ohms at 1 kHz.
Most MC cartridges will work well at the medium gain setting. There
is also a low (voltage down 6dB) setting and a high (voltage up 6dB)
Most audio signal cables are designed to transfer voltage changes. The Phono Loco input
voltage is zero and doesn’t change. What does change is current. That
is generally a favorable condition for cable performance
If your dealer has taken on the Phono Loco,
they will have the experience to help build a superb analog playback
front end. Your dealer will have explored various combinations. You
don’t have to spend your money until you personally experience the
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