This is a great sounding tube preamp. The sound is warm and natural,
but somehow also revealing of upstream equipment and sources. The
upgrade was performed in November 2014. Signature Plus is basically the
previous signature upgrade, with the substitution of V-caps for the
caps previously used. The V-caps can be seen in the photo. There's
stats below in case anyone is interested, but the main thing is the
sound. I can't verify this, but the Signature is purported by some to
be very close to the LA300ME.
The "New Retail Price" represents the original cost of a factory manufactured unit.
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Input Impedance: 15,000 ohms
Output Impedance: Selectable 400 ohms & 1200 ohms
Gain: Selectable 8 db & 4 db
Tube complement: : 4-6350's, 2-6EM7's