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HALF POWER two-way toggle switch. Use this switch to reduce the output power of the amplifier from 100W to 50W. Doing
so will slightly reduce volume, and change the feel and response of the amplifier slightly. Experiment for best results!
BIAS CHECK DMM probe jacks – see Section 5 (page 9) for a thorough explanation on their use and biasing
SPEAKER OUTPUT ¼" speaker cable jacks. Use a ¼" speaker cable to connect your speaker cabinet to the amplifier using
these jacks. If you use one speaker cabinet, use the jack labeled MAIN. If you want to run two cabinets in parallel, connect the
second cabinet to the amplifier using the jack labeled EXTENSION.
NOTE – never turn your amplifier to OPERATE mode without connecting the amplifier to a speaker cabinet or suitable dummy
load! Failing to do so may damage your amplifier!
IMPEDANCE three-way rotary selector. Set this selector to the position that matches the impedance of your speaker cabinet.
NOTE – if you are using two speaker cabinets in parallel (ex – two 16 Ohm cabinets), set the impedance selector to half that of
a single cabinet (in this case, 8 Ohms).
EFFECTS LOOP RETURN ¼" instrument jack can be used to directly interface the power amp of the Joyful Music!, thereby
bypassing the preamp and using the amplifier as a power amplifier. Conversely, this is usually used as the RETURN of the
effects loop. Plug the output of your effects unit, or interface device (ex – C-lator, Klein-ulator) into this jack using ¼" instrument
cable. The effects loop in the Joyful Music! amplifier is all passive.
EFFECTS LOOP SEND ¼" instrument jack can be used to directly interface the preamp of the Joyful Music!, thereby bypassing
the power amplifier and using the JM as a preamp. Conversely, this is usually used as the SEND of the effects loop. Plug the
input of your effects unit, or interface device (ex – C-lator, Klein-ulator) into this jack using ¼" instrument cable. The effects
loop in the JM amplifier is all-passive. If only using the preamp of the Joyful Music!, the amplifier still must be connected to a
suitable speaker or passive load.
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