TCL-2
TCL-2 REAR PANEL
(1) INPUTS "In 1 (Left), In 2 (Right)"
Conventional 3-pin female XLR input jacks for all balanced or unbalanced line level signals. In-
put impedance is greater than 10k ohms when "10 dB" gain range switch is engaged (+/- 10dB),
greater than 40k ohms when gain range switch is disengaged (+/- 20dB), and greater than 100k
ohms when optional balanced inputs are installed. Standard TCL-2 line input is unbalanced us-
ing pin 1 as chassis ground, pin two as signal, and pin 3 tied to audio ground.
(2) OUTPUTS "Out 1 (Left), Out 2 (Right)"
Conventional 3-pin male XLR output jacks. Output is unbalanced. Pin 1 is chassis ground, pin
2 is signal, and pin 3 is tied to audio ground. J-FET topology output impedance is 55 ohms.
Vacuum tube output impedance is 150 ohms.
(3) EARTH/AUDIO GROUND JUMPER
A barrier terminal which ties earth ground to audio ground. If ground "hum" loops are experi-
enced when using the TCL-2, removing this jumper may help. Using this jumper, the integrity
of the chassis/earth ground connection is never compromised.
(4) AC VOLTAGE MAINS SELECTION "100-120" or "200-240"
A power entry module with a removable fuse holder block. This fuse holder block is selectable
for 100 to 120 Volt or 200 to 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 TCL-2 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 correspond 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 5x20mm, 1A, slow blow, 250V, Littelfuse 239 or equivalent.
For 200-240 VAC mains, use 5x20mm, 500 mA, slow blow, 250V, Littelfuse 239 or equivalent.
(5) POWER ENTRY "IEC Power Receptacle"
An IEC-type AC line-power receptacle for use with removable cords. Use only the power cord
provided with the TCL-2 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 (item number 3, above).
NOTE: Units configured for 200-240 do not have a power cord included. Contact your dealer
or distributor for a cable appropriate for your country.
