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Summary of Contents for Ceriatone JM 100w
- Page 1 Ceriatone Joyful Music! 50/100W all-tube guitar amplifier User’s Manual...
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Page 2: Table Of Contents
Thank you for the purchase of your Ceriatone JM50/JM100 Joyful Music! guitar amplifier! Here, we hope to explain how best to use your new amp. Table of Contents 1) About the JM..……………...…………………………………………………………………………………………page 2 2) Quick setup……………………………………………………………………………………………………………page 3 3) Front Panel controls………………………………………………………………………………………………….page 4 4) Rear Panel controls…………………………………………………………………………………………………..page 7... -
Page 3: Quick Setup
In order to produce the most sonically faithful recreation possible, we continued to pour additional time, manpower, and money into many custom parts specifically for this amplifier. In our humble opinion, the result of our labors is truly sublime and an entirely unique circuit compared to our OTS series. -
Page 4: Front Panel Controls
3) FRONT PANEL CONTROLS From left to right: 1) INPUT ¼” instrument jack 2) GAIN control 3) BRIGHT three-way toggle switch 4) MID BOOST three-way toggle switch 5) DEEP two-way toggle switch 6) TREBLE control 7) MIDDLE control 8) BASS control 9) SEND (REVERB) control 10) RETURN (REVERB) control 11) MASTER control... - Page 5 INPUT is a ¼” jack for instrument cables. Plug your guitar in here. GAIN adjusts the signal strength coming out of the tonestack, and going into the second tube stage. Think of this as a traditional gain control in a primarily clean amplifier. BRIGHT is a high-frequency boost that can be used to add sparkle to your tone in both clean and overdrive modes.
- Page 6 RETURN (REVERB) controls the amount of signal from the three-tube reverb circuit as blended back into the preamp circuit. The RETURN control will generally increase the prominence of the reverb signal compared to the dry signal. Turning the REVERB control clockwise will make the reverb sound louder compared to the dry signal, creating a more wet, effected sound. MASTER sets the overall volume of your amplifier.
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Page 7: Rear Panel Controls
4) REAR PANEL CONTROLS 1) HT slow-blow fuse 2) MAINS slow-blow fuse 3) A.C. MAINS IEC cable inlet 4) HALF POWER two-way toggle switch 5) BIAS CHECK multimeter probe jacks 6) SPEAKER OUTPUT ¼” speaker jacks 7) IMPEDANCE three-way rotary selector 8) EFFECTS LOOP RETURN ¼”... - Page 8 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 –...
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Page 10: Tube Compliment And External Bias Jacks And Adjustment
5) TUBE COMPLIMENT AND EXTERNAL BIAS JACKS AND ADJUSTMENT From left to right: V9, V8, V7, V6 – 6L6GC power tube V5 – 12AX7 / ECC83 (phase inverter) V4 – 12AX7 / ECC83 (reverb / preamp mixer) V3 – 12AT7 / ECC81 (reverb driver) V2 –... - Page 11 NOTE : V6 = BIAS CHECK “D”, V7 = BIAS CHECK “C”, V8 = BIAS CHECK “B”, V9 = BIAS CHECK “A”...
- Page 12 To measure your power tube bias, carefully follow these steps with the amplifier in OPERATE and connected to a speaker load (not doing so may damage your amplifier!): 1) Turn on a digital multimeter (DMM), and set it to read millivolts (mV) in the 100mV range (this will vary from DMM to DMM) 2) Plug a black probe into the color-coded jack on your DMM, and do the same for a red probe 3) Insert the black probe tip into the black probe jack labeled COM on the rear of the amplifier.
- Page 13 An example is as follows: 30�� × 55% × 1000 = ���������� 35 − 40���� 455������ You might wonder why your DMM is set to millivolts and not milliamps – simply, we have a 1 Ohm resistor placed between your probe jacks and ground to convert a current reading to a voltage reading.
- Page 14 Even though the bias test points and adjustment are external to reduce risk of electrical shock, all precautions must be taken while biasing. Again, bias at your own risk. Ceriatone Amplification is not responsible for any damages or injuries resulting from user biasing.
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Page 15: Frequently Asked Questions
Usage of other power tubes (ex – modern 6V6s like Electro-Harmonix, JJ) may be possible, but please first consult Ceriatone Amplification or your local competent amplifier technician. ONLY USE A 12AT7 / ECC81 IN V3!!!! What settings do you recommend? - Try setting all controls at 12:00, and adjust MASTER to a suitable volume. - Page 16 Do I need to use matched power tubes? - Although not necessary, matched power tube sets are recommended for best results. Do I need to use a matched and balanced phase inverter? - It is not necessary. Feel free to experiment with different tubes (of the same type) in your JM, though! I’ve read that the components used in this type of amplifier are really important.