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IMPEDANCE
SELECTOR
T.P. ADJUST
AC LINE IN
BIAS
100 / 120 VAC T5A SLO BLO
220 / 240 VAC T2.5A SLO BLO
TO REPLACE THE RISK OF FIRE,
REPLACE FUSE WITH SAME TYPE
AND RATING.
UTILISER UN FUSIBLE DE RECHANGE
DE MEME TYPE.
168
RISQUE DE CHOC ELECTRIQUE. NE PAS OUVRIR.
TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK,
DO NOT EXPOSE THIS APPLIANCE TO RAIN OR
MOISTURE.
AVIS:
WARNING:
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
MODEL VC-60
SERIAL # A
MADE IN THE U.S.A. BY SLM ELECTRONICS
1400 FERGUSON AVENUE, ST. LOUIS, MO 63133
EXT. MAIN
(USE FIRST)
SPEAKERS
120 WATTS RMS
SPEAKER IMPEDANCE MUST MATCH
SELECTED AMPLIFIER IMPEDANCE
MODEL:
SERIAL:
LINE: V ~ Hz
WATTS: MAX
VC-120H
VC-120H0000001
18 19
FOOTSWITCH
TIP = CH. SELECT
RING = LOOP ON/OFF
SLEEVE = GROUND
EFFECTS LOOP
RST
S
T
R
NOTE: BIAS ADJUSTMENT
SHOULD BE PERFORMED
ONLY BY QUALIFIED SERVICE
TECHNICIAN.
22
RETURN
SEND
EFFECTS LEVEL
010
17 20 21 23 2524
The Rear Panel:
17. FOOTSWITCH JACK: Connect the supplied two button
footswitch for control of channel switching and the effects
loop on/off. The tip of the jack is for channel switching; the
ring is for effects. When a footswitch is connected here, the
front panel channel select switch is disabled.
18. EFFECTS LOOP SEND JACK: Connection to an external
effects device is made via this jack. Connect a shielded
instrument patch cord from the send jack to the input jack
of the effect. The send jack also doubles as a "preamp out"
jack, to feed a post-eq signal to a mixing board, recording
console or external amplifier.
NOTE: Effects loop operation is parallel with the signal
path. Mix controls on the effects should be set to 100% (full
wet). If no effects are connected to the Effects Loop, the
Effects Level control (#20) acts as an extra volume boost
which can be activated by the footswitch. For the best sig-
nal to noise ratio when NOT using the effects loop, keep
the Effects Level control (#20) set to “0”.
19. EFFECTS LOOP RETURN JACK: Connection from an
external effects device is made via this jack. Connect a
shielded instrument patch cord from the output jack of the
effect to the return jack. The return jack also doubles as a
"power amp in" jack, to feed a line-level signal directly into
the internal power amp. This is useful when "slaving" two
amplifiers together. When using in this mode (slaving),
make sure the front panel Master volume controls are all
the way down (at “0”).
20. EFFECTS LEVEL CONTROL: Use this knob to set the
input level of the signal from the Effects Loop Return jack
(#19). The Effects Loop Send level is adjusted by the
Master volume controls (#6).
21. SPEAKER JACKS: Connect the amplifier to your speaker
cabinet(s) via these jacks, using heavy-duty speaker
cables (not instrument patch cords). Use cabinets rated at
8 ohms or higher, in combinations which never create a
load lower than 8 ohms. Make sure the Impedance switch
(#22) is properly set. Always use the MAIN speaker jack
first, then connect to the EXTENSION jack if using more
than one cabinet.
22. IMPEDANCE SWITCH: For the best performance and
least strain on the amp, you MUST match the amp’s imped-
ance to that of your speaker cabinet(s). Set the selector
switch to the 8 or 16 ohm position, depending on the total
impedance of your cabinets. The chart below can help you
determine that impedance based on the following combi-
nations of speakers connected in parallel.
CAB IMP. # OF CABS TOTAL IMP.
16 ohms 2 8 ohms
32 ohms 2 16 ohms
32 ohms 4 8 ohms
23. BIAS ADJUST / BIAS TEST POINT: For qualified
Service Personnel only! (All others please just ignore
these internal Bias adjustment potentiometers.)
24. FUSE: This fuse protects the amplifier against damages
caused by overload conditions in the unit. If the fuse blows,
replace it only with the same size and type as indicated on
the rear panel. If the fuse blows continually, the line voltage
may be incorrect, or the amp may need servicing.
25. AC LINE IN: Firmly plug the female end of the supplied
power cord into this socket, pushing it in until it is fully seat-
ed. Plug the male end of the cord into a properly grounded
AC outlet of the correct voltage. DO NOT DEFEAT THE
GROUND PIN OF THE AC PLUG! Use only the supplied
power cord. If the amplifier is to be used outside of the
United States, see your authorized Crate dealer for infor-
mation about alternate line cords and power converters if
needed.
VC-120H Amplifier