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music. For best performance, the SuperNova should be left ON when not in use (in
Charging Mode). Remember to let the SuperNova warm-up for one hour if you
should disconnect it.
11) MIKE YEE’S NOTES ON THE SUPERNOVA
The SuperNova is a three-input phono preamplifier intended for use with more than
one turntable or a turntable with more than one tonearm. There is user-adjustable
loading and gain for each of the inputs. The loading and gain is set via switches and
is accessible from the rear of the chassis.
The SuperNova switching between the inputs does not actually switch the inputs and
loading, but rather by three independent front ends that are switched by means of
switching the current source to one of the front ends. The outputs of the front ends
are summed into the back-end circuitry. In this way no switching occurs in the signal
path when not using the switched attenuator.
The SuperNova is fully dual mono and is powered from a remote dual mono power
supply. The remote power supply supports NiMH rechargeable batteries but is
designed to work perfectly without the batteries.
The batteries will allow the SuperNova to run completely isolated from the wall
power for a period of three hours. There are four independent charging circuits for
the four battery packs.
The SuperNova has an 11-position switched attenuator output that allows "direct
output" to a power amplifier.
HOW THE LIMITED ATTENUATOR WORKS:
Gain in a typical system: Gain with a Limited Attenuator
and SuperNova:
Moving-coil Phono Stage 60dB
Line Amp 18dB Moving-coil Phono Stage 40dB
Power Amp 30dB Power Amp 30dB
____ ____
Total Gain = 108dB Total Gain = 70 dB
Required Attenuation = -30dB Required Attenuation = -5dB
Most Audio systems have far too much gain. The excess gain needs to be reduced by
setting an attenuator by a typical -30dB. By fine-tuning the SuperNova Gain
Switches and using the Limited Attenuator, typical listening can be done with little or
no attenuation. By reducing unneeded gain, the system does not need to work as
hard, thereby achieving a more natural sound. The extra 25dB gain equates to about
20 times more work. Imagine working 20 times harder than you need to?
The Limited Attenuator has a major advantage over a Passive Attenuator. A Passive
Attenuator typically has significant output impedance creating sensitivity to the
particular type of output cable. The Limited Attenuator has much lower output
impedance.
(12 pages)
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