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INTRODUCTION
The 12k72 is a high class preamplifier which contains a 'module' per channel.
The main feature of these 'modules' is a sound completely clear and
transparent, with deep bass and an extremely natural treble.
The components used in manufacturing come essentially from the same
manufacturers that supplied the ones used originally, reproducing and
expanding the benefits of these. Everything inside this preamplifier is high
quality: the wires, rotary switches, capacitors, resistors and connectors.
STAGES
The 12K72 is formed by two stages, the first gain stage is set with a Gain
control, while the second stage remains fixed.
The Output control regulates the amount of signal passing from the first stage
to the second stage (as a typical fader function).
HEATING AND WARM-UP
It is advisable to wait a minute after turning it on, to modify the gain and output
levels, this way avoiding any noise generated by the lack of capacitor charging.
An effect that may damage the reference speakers.
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