5. Connect the power supply to the mains (do this last!)
The «Edison» phono amplifier usually doesn’t need special power
conditioning because there is already a power filter integrated into the
power supply.
A good, direct connection to the mains without disturbance is beneficial
for the «Edison», it is important not to connect the phono amplifier to
the same AC outlet as for example the power amplifiers, which have
irregular power consumption.
Operation
Pushing the “on-off” switch engages the display and the LED at the
„mute“ switch. The „mute“ switch is disabled as long as the display
shows „Edison“. During this time the tubes are heating up.
About two minutes later the display shows the previously selected input,
the gain for this input is calibrated in dB, the functions “xfmr” and
“mono” if selected, optionally the phase 0° or 180°, whatever has been
selected for this input.
By switching to another input all the preselected functions for this next
input are shown.
All these functions are stored in a micro processor when another input
is selected or the unit is switched off. The individual configurations are
still stored when the «Edison» is disconnected from the mains and is
moved to another place.
„Mute“ and the input selector can also be switched from the remote
control.
Optimizing the sound
Allow us to share some advice with you as to how to extract the
«Edison»’s best sound performance:
The back panel shows the switches for adjusting the resistive load on
the inputs. The values are 47k, 10k, 5k, 2k, 1k, 600ohms, 400ohms,
200ohms, 150 ohms 100ohms 75ohms and 50ohms.
These resistive loads will assure that peaks coming from the cartridges
are well damped or even a “soft roll off” is preferred.
The adjustments allow for individually loading all cartridges and even for
personally preferred sound aspects.
The 47kohms allow for connecting MM cartridges to the «Edison».
Seen from the back the most left position starts with 47kohms, the
center position is 400ohms.
The load values will change when the transformer „xfmr“ is switched
into the signal path :
47kohm > 10kohm, 10kohm > 5k5ohm, 5kohm > 3k5ohm, 2kohm >
1k7ohm, 1k > 900ohm, the lower values are not affected in a way that
needs attention.
As the 47kohm are gone with the transformer in the signal path, no MM
cartridges can be used anymore.
On the other hand the use of the transformer gives the inputs a true
balanced state, what means that both poles (pin 2 and 3 of the XLR
socket) are „hot“, carry signal.
