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> To get technical, the input noise impedance (optimum for noise) of a
> direct solid state input will not match a mic at 150ohms without a
> transformer.
David,
I think that this not an issue anymore with modern operational amplifiers. =
The
spec sheets of the best recorders with transformer-less inputs all exhibit =
an
EIN of -130 dBu(A), which I believe cannot be surpassed by transformer-base=
d
preamps.
See for instance this integrated instrumentation amplifier that has been
specifically optimized for mic preamps:
http://www.ti.com/lit/gpn/ina163
Read the NOISE PERFORMANCE section at page 6.
Regards,
Raimund
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