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Summary of Contents for Ceriatone 2550
- Page 1 2550 50W Amplifier User’s Manual...
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Page 2: Table Of Contents
You’ll notice our version holds true sonically, and includes modern features including external bias measurement and adjustment, an effects loop, and an available post phase inverter master volume control. Most of all, we hope the 2550 and 2555 become an integral part of your tone equation to exhilarate your playing and music. Rock on! -
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 bottom right of the front panel 2) Plug a suitable power cable from the amp’s rear panel MAINS cable inlet to your wall power receptacle 3) Plug the amp into your speaker cabinet using 1/4”... -
Page 4: Front Panel Controls
3) FRONT PANEL CONTROLS From left to right: 1) INDICATOR LED 2) POWER 2-way toggle switch 3) STANDBY 2-way toggle switch 4) MASTER VOLUME control (optional) 5) PRESENCE control 6) BASS control 7) MIDDLE control 8) TREBLE control 9) OUTPUT MASTER control 10) LEAD MASTER LED 11) CHANNEL 2-way toggle switch 12) LEAD MASTER control... - Page 5 INDICATOR will illuminate when the amp is powered by turning the front panel POWER toggle switch to the ON position. If INDICATOR does not turn on, check your power cable connections, and then the fuse on the rear of the unit. POWER two-way toggle switch powers the amp on and off.
- Page 6 CHANNEL 2-way toggle switches between the Clean and Lead channels of the amplifier. LEAD MASTER LED will turn on when the LEAD channel has been selected. LEAD MASTER adjusts the volume of the LEAD channel in comparison to the CLEAN channel. This is only active in the LEAD channel.
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Page 7: Rear Panel Controls
SEND ¼” instrument jack can be used to plug the input of your effects unit. The placement of the FX loop is somewhat non- traditional for the 2555 and 2550, and we recommend it only for use of FX units. - Page 8 BIAS TEST and COM multimeter probe jacks – use this for external bias current measurements (see Section 5, Page 8) PENTODE / TRIODE switches the power output of the power amp. For the 2550, half mode is approximately 25W. HALF mode configures the power tubes to run in triode operation, and this negates any need to reconfigure the IMPEDANCE SELECTOR.
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Page 9: Tube Compliment And Bias Adjustment
5) TUBE COMPLIMENT AND BIAS ADJUSTMENT From left to right: V1 – 12AX7/ECC83 (Input and stage 2 gain stages – both channels) V2 – 12AX7/ECC83 (stages 3 [to FX SEND] and 4 [input from FX return]) V3 – 12AX7/ECC83 (phase inverter for power amplifier) V4-5 –... - Page 10 To measure your power tube bias, carefully follow these steps with the amplifier in OPERATE, MASTER at minimum, 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 probe jack labeled COM.
- Page 11 An example is as follows: 25�� × 60% × 1000 = ���������� 35���� 440������ 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. That way, a bias current of 35mA measures as 35mV on your DMM.
- Page 12 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 13: Frequently Asked Questions
6) FREQUENTLY ASKED QUESTIONS How do I hook up this thing? - See Section 2, beginning on page 3. Is the FX loop series or parallel? Active or passive? - The FX loop is series, and is active in a non-traditional sense, in that it sits between two active gain stages. It does not have the same performance of a standard tube-driven effects loop, given that the send is tapped off a high impedance plate network, but still performs better than a fully passive loop. - Page 14 NOS components from our vast surplus parts collection in locations they work well and complement the voicing or enhance the performance of the amplifier. I like to use rack-mounted multieffects units. What is the output level straight from the EFFECTS LOOP SEND jack, -10dB or +4dB? - While not exact, -10dB is a better approximation than +4dB.
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Page 15: Settings Templates
7) Settings templates...
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