Millennia LOC Analog Legacy Phonographic / Archiving Preamplifier - Manual (Page 4)


LOC
Millennia
Media & Music Systems

LOC Millennia
Media & Music Systems
LOC REAR PANEL
() Inputs:
Bal Phono Input 
Conventional 3-pin female XLR input connectors for use with differential-balanced phono
cartridges. Can also be used with certain line-level sources. Standard input load resistance is 47,000 ohms. This
resistance ( R1 and R2 on each phono preamp PCB) can be changed by the user to facilitate different phono car-
tridge load requirements. See phono preamp PCB illustration on page 11. Standard input load capacitance is 470
pF. This capacitance (C1 on each phono preamp PCB) can be changed by the user if necessary, but should not
be lower than 270pF. XLR pin 2 is positive polarity. XLR pin 3 is negative polarity. Connector contacts are Neutrik
gold plated. It is suggested that XLR cable connectors used with the LOC employ identical plating.
Bal Phono Input 2,
Conventional 3-pin female XLR input connectors for use with all standard phono cartridges.
Can also be used with certain line-level sources. Inputs 2 and 3 connect to an input transformer.
Unbal Phono In 
Unbalanced RCA input. To use the RCA input connections, select “RCA IN” on the front panel
Use your cartridge manufacturers recommended R/C loading. The cartridge loading can be modified by changing
resistors R2 and R4 and capacitors C1 and C2 on the Input Transformer PCB. See illustration on page 13. J3 and
J6 are normally open. If you are only using this unbalanced in, you can jumper it if necessary for hum problems.
(2) Phono Pre Dir Out
Buffered Direct output from the pre amp card. Post polarity and mono switching. This is the same signal fed into
the compensation and filter circuits.
() Phono Pre Trim Out
Adjustable, buffered signal derived from the Direct out.
(4) Unbal EQ Out Pre Trim
Post filter and compensation circuit unbalanced signal. Available in both RCA and XLR connections. Output RCA
connections are independent of input switching.
() Bal EQ Out Post Trim
Balanced output from the compensation and filter circuits.
(6) Earth/audio Ground Jumper Strap
A barrier terminal which ties earth ground to audio ground. If ground “hum” loops are experienced when using
the LOC, removing this jumper may help. Using this jumper to lift ground, the integrity of the chassis/earth safety
ground connection is never compromised.
() AC Voltage Mains Selection “00-20” or “200-240”
A power entry module with a removable fuse holder block. This fuse holder block is selectable for 100 - 120 Volt
or 200 - 240 Volt worldwide mains powering. The fuse block contains two fuses one fuse is in series with the hot
power line while the other fuse is in series with the neutral power line. Both fuses must be installed. To change the
mains voltage selection, remove IEC power connector and assure that the LOC is not connected to mains power.
With a non-conductive tool, gently pry the fuse block away from the power entry module. Remove the two fuses
and replace both with type as shown below. Slide out the internal PC Board, turn it over, and reinsert the PCB so
that the desired AC mains voltage appears in the viewing window. Double check that the fuses installed corre-
spond to the AC mains voltage range which appears in the viewing window. Gently push the fuse block back until
flush and snug.
FUSES:
For 100-120 VAC mains, use two 5 x 20 mm, 1A, slow blow, 250 V, Littelfuse 218 or equiv.
For 200-240 VAC mains, use two 5 x 20 mm, 500 mA, slow blow, 250 V, Littelfuse 218 or equiv.
Use only the power cord provided with the LOC unit or equivalent U/L approved type SV, SVT, SJ, or SJT AC
power supply cord. Do not defeat the third pin earth ground. If ground lifting is desired, remove the Earth/Audio
Ground Jumper Strap (topic #6, above).
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