Specifications

CARTRIDGE LOADING - CAPA C I TA N C E
With some phono cartridges (both MM and MC), the
addition of some capacitance loading to the cartridge
may prove beneficial in “taming” any high frequency res-
onance or response peaks inherent in the design of the
cartridges. Typical capacitance values for MM cartridges
are in the range of 100 to 250pf. We suggest that you
discuss the possible loading requirements of your car-
tridge with the dealer where you purchased the cartridge
or with the cartridge manufacturer. The additional capaci-
tance may be soldered to the “C-Load” solder terminals
(both channels).
After the insertion of the tubes and the phono stage set-
up, replace the cover and fasten it with the screws provid-
ed. The Pre 1 is now ready for operation. For further infor-
mation on tube replacement, NOS (New Old Stock) tubes,
loading, resistance or capacitance parts contact a Sonic
Frontiers Customer Service Representative or The Parts
Connection, a division of Sonic Frontiers.
O P E R A T I O N
Before plugging in the Pre 1, check to see that the unit is
configured for the correct AC line voltage for country of
use. The operating AC line voltage is indicated on the side
of the shipping box. If the Pre 1 is set incorrectly for the
country in which it is to be operated, contact the dealer or
distributor in your area. If the unit is configured properly,
continue with operation.
Connect the DC Power Supply Cord (J) to the Pre 1 DC
Input (K) (see Figure 3) before connecting the Detachable
Power Cord to the Pre 1 Power Supply chassis (I) (see
Figure 4). Plug your Pre 1 into the AC power source.
Note: Never operate the Pre 1 Power Supply when not
connected to the DC input on the main chassis.
All remaining connections are made with co-axial cable
and RCA connectors to or from other single-ended units.
Connect source units to the Inputs of the Pre 1 (N and P);
left channel to left channel and right channel to right channel.
If a tape or other line level recording or processing device
is being implemented, connect the left and right audio out-
put of the unit to the corresponding left and right Tape/
EPL Input (O) of the Pre 1. Also connect the left and right
Tape/EPL Outputs (M) on the Pre 1 to the corresponding
left and right audio inputs of the external device.
Connect Set 1 of the Main Outputs (L) on the Pre 1 to a
stereo amplifier or two mono amplifiers; left channel to left
channel and right channel to right channel. Set 2 of the
Main Outputs (L) may be used under different situations
and in combination with Set 1. These situations include
biamping, the use of active crossovers, powered sub-
woofers and other equipment; all situations being unique
and system dependent. Refer to the instruction manuals
provided with the other equipment before using the sec-
ond set of Outputs.
The Pre 1 is now ready for operation. Power the Pre 1 by
placing the On-Off button (G) in the ON position. The
Power Indicator LED (E) will stay DIM for approximately 45
seconds. During this time, the signal outputs are muted
while the tubes are warming up and stabilizing. As soon as
the Power Indicator LED is at steady, normal intensity, the
Pre 1 is ready to play.
Select a ready source through the Selector Switch (A).
Balance is adjusted through use of the Balance Control (B);
turning it left and right will adjust the left and right levels
respectively in a -6dB adjustment range. The center detent
is an indicator for equal, or balanced, left and right levels.
Volume is adjusted through use of the Volume Control (C).
Turning this control clockwise increases the volume level
of both channels. Be sure the level is sufficiently low when
turning the unit ON or returning to the OPERATE mode
after MUTING, to prevent damage to speakers, amplifiers
or the Pre 1 itself.
To record from a source, place the Tape/EPL-Source but-
ton (D) in the SOURCE position, select the source material
you wish to record via the Selector Switch (A), and com-
mence recording. To play back a tape recording, place the
Tape EPL/ Source button in the TAPE position.