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Summary of Contents for Ceriatone Overtone Special
- Page 1 Ceriatone Overtone Special 20W Mini “Lunchbox” Amplifier User’s Manual ...
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Page 2: Table Of Contents
Thank you for the purchase of your Ceriatone Overtone Special 20W Mini guitar amplifier! Here, we hope to explain how best to use your new amp. Table of Contents 1) About the Overtone Special…………………………………………………………………………………………page 2 2) Quick setup……………………………………………………………………………………………………………page 3 3) Front Panel controls………………………………………………………………………………………………….page 4 4) Rear Panel controls…………………………………………………………………………………………………..page 7... -
Page 3: Quick Setup
2) QUICK SETUP (for instant gratification) 1) Plug your guitar using a 1/4” instrument cable into the INPUT on the far right of the front panel 2) Plug a suitable power cable from the OTS’s rear panel MAINS cable inlet to your wall power receptacle 3) Plug the OTS into your speaker cabinet using 1/4”... -
Page 4: Front Panel Controls
3) FRONT PANEL CONTROLS On the front panel of the Overtone Special, you can see fourteen items of interest. From left to right: 1) POWER two-way toggle switch 2) STANDBY two-way toggle switch 3) INDICATOR LED 4) PRESENCE control 5) MASTER control... - Page 5 POWER two-way toggle switch powers the OTS on and off. With the toggle switch in the UP position, the OTS is ON. In the DOWN position, the OTS is OFF. STANDBY applies high voltage to the vacuum tube anodes (and screen grids) during use of the OTS. To ensure long tube life, first power the unit on with the toggle switch in STANDBY position for approximately 30 seconds.
- Page 6 TREBLE adjusts the high frequency response for both clean and overdrive modes. At near-maximum settings, you may also notice an increase in gain. ROCK / JAZZ adjusts the overall frequency response and voicing of the amplifier. ROCK has a fatter midrange and a deeper, spongier bottom end.
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Page 7: Rear Panel Controls
4) REAR PANEL CONTROLS On the rear panel of the Overtone Special, you can see ten items of interest. 1) FOOT PEDAL 5-pin DIN female jack 2) OD TRIM control 3) EFFECTS LOOP SEND ¼” instrument jack 4) EFFECTS LOOP RETURN ¼” instrument jack 5) IMPEDANCE three-way rotary selector 6) SPEAKERS EXTENTION ¼”... - Page 8 FOOT PEDAL 5-pin DIN female jack is used to connect the foot pedal to the amplifier. Use the foot pedal to control the OVERDRIVE and PREAMP BOOST modes. Red LED indicates OVERDRIVE, and Green LED indicates PREAMP BOOST. OD TRIM control. This control adjusts the signal strength sent to the first tube stable in the OVERDRIVE channel. Lower settings yield more touch-sensitive, lower gain sounds.
- Page 9 HT FUSE 0.5A slow-blow fuse – used to protect your amplifier, particularly during the event of tube failure. Replace only when necessary. MAINS FUSE 2A slow-blow fuse – used to protect your amplifier from voltage spikes or excessive current draw. Replace only when necessary.
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Page 10: Tube Compliment And Bias Adjustment
5) TUBE COMPLIMENT AND BIAS ADJUSTMENT From left to right: V1 – 12AX7/ECC83 (clean and overdrive stages 1 and 2) V2 – 12AX7/ECC83 (overdrive stages 3 and 4) V3 – 12AX7/ECC83 (phase inverter for power amplifier) V4 – 6V6 V5 – 6V6 ... - Page 11 In these pictures, we have color coded the important features for simplicity 1) Blue arrow = bias adjustment potentiometer shaft 2) Yellow arrow = power tube pin connected to 1 Ohm bias measurement resistor 3) Red arrow = ground pin connected to 1 Ohm bias measurement resistor NOTE –...
- Page 12 4) Touch the red probe tip to the power tube pin connected to the 1 Ohm bias measurement resistor (yellow arrow) on the far left. This measures bias for the 6V6 in that socket position. Right down the value your DMM reads. You might expect a value between 23mV and 25mV.
- Page 13 Biasing should only be done on a clean workbench with no distractions. Do not wear loose clothing or any jewelry. Take your time, and think carefully before each step. 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 14: Frequently Asked Questions
6) FREQUENTLY ASKED QUESTIONS How do I hook up this thing? - See Section 2, beginning on page 3. When I plug effects into the effects loop, my tone noticeably changes. Sometimes the effects don’t sound quite right. What’s the deal? - Generally, what you’re hearing is a significant mismatching of impedances, and/or an overloading of the effect unit itself. - Page 15 I’ve read about something called a PI trimmer inside of the amp. Does the OTS Mini have it? - No, we omitted it from this design for simplicity. 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.
- Page 16 This all seems kind of complicated, can you tell me where all of these controls are in the preamp so I have a better idea how to set up my amplifier? Clean a nd Tonestack Input V ol Clean ...
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Page 17: Settings Templates
7) Settings templates ... - Page 18 ...