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General| Power Output | 100 Watts |
|---|---|
| Channels | 2 |
| Reverb | No |
| Effects Loop | Yes |
| Speaker Output Impedance | 4, 8, or 16 Ohms |
| Tubes | 4 x EL34, 3 x ECC83 (12AX7) |
| EQ | Bass, Middle, Treble |
| Controls | Bass, Middle, Treble, Gain, Presence, Master Volume |
| Dimensions | 29.5" x 12.2" x 8.3" |
| Type | Tube Amplifier |
| Inputs | 2 x 1/4" (High and Low Sensitivity) |
Describes the JCM900 4100 as a versatile, high-gain, all-valve amplifier with two channels and footswitchable reverb.
Details on connecting the mains lead and using the correct fuse for safety.
Instructions for safely moving the amplifier, including unplugging all cables.
Essential steps for setting up the amplifier correctly, including speaker connection and power sequence.
Explains the INPUT jack and the PREAMP GAIN controls for Channels A and B.
Details the TREBLE, MIDDLE, BASS, PRESENCE EQ, and REVERB controls for Channel A.
Describes MASTER VOLUME controls for both channels and the CHANNEL B 'ON' switch.
Covers the FOOTSWITCH connector, STANDBY switch, and POWER switch functions.
Details the LOOP LEVEL, SEND, and RETURN jacks for connecting external effects.
Describes RECORDING COMPENSATED and DIRECT LINE OUTPUTs for external connections.
Explains impedance matching, speaker connections, and the HIGH/LOW power output mode.
Explains the VALVE FAILURE LEDs and FUSES for output valves 1-4 and 2-3.
Details the MAINS INPUT connection and the MAINS POWER FUSE for protection.
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