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Related Manuals for Ceriatone Plexi 51 All Access
Summary of Contents for Ceriatone Plexi 51 All Access
- Page 1 50W Amplifier User’s Manual...
- Page 2 So we thought that it might perhaps be a great idea to come up with an amplifier that can have as many Plexi features inside of one amp. Thus, the Plexi 51 All Access is born – an amplifier that allow the user to have it ALL, Plexi wise! With this amp, you don‟t have to buy all 5 variations of the Plexi from us.
- Page 3 2) QUICK SETUP (for instant gratification) 1) Plug your guitar using a 1/4” instrument cable into the upper I input on the right of the front panel 2) Plug a suitable power cable from the rear panel MAINS cable inlet to your wall power receptacle 3) Plug the Plexi into your speaker cabinet using 1/4”...
- Page 4 7) Set front panel POWER switch in the ON position (down position, with adjacent STANDBY switch in the “STANDBY” mode) for 60 seconds to allow tube filaments to warm up. Select the Rectifier to be in SS (Solid State) mode first. 8) Set front panel STANDBY switch to “ON”...
- Page 5 STANDBY applies high voltage to the vacuum tube anodes (and screen grids) during use of the amp. To ensure long tube life, first power the unit on with the STANDBY toggle switch in UP position for approximately 60 seconds. You can then switch to DOWN (“ON”) to use the amp.
- Page 6 bypass capacitor, while those with 0.022uF have a bypass capacitor.. We invite you to try different combinations! 0.68uF (Left), None (Middle), 330uF (Right). TREBLE adjusts the high frequency response V1B is a 2 way switch which selects the value of the V1B coupling capacitor. Some Plexis come with 0.022uF, while some with 0.0022uF.
- Page 7 1) SPLIT/SHARED CATHODE switch 2) TONESTACK switch 3) SEND ¼” instrument jack 4) LOOP ON OFF switch 5) RETURN ¼” instrument jack 6) IMPEDANCE SELECTOR three-way rotary selector 7) SPEAKERS ¼” speaker jacks (x2)\ 8) NEGATIVE FEEDBACK (NFB) 9) BIAS TEST probe jacks (x4) 10) COM probe jack 11) FULL / HALF 2-way toggle switch 12) HT FUSE...
- Page 8 SPEAKERS 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, either jack is acceptable. NOTE – never turn your amplifier to OPERATE mode (“1” / DOWN position on STANDBY) without connecting the amplifier to a speaker cabinet or suitable dummy load! Failing to do so may damage your amplifier! NEGATIVE FEEBACK (NFB) is a 3 way switch to select different NFB resistor values:...
- Page 9 5) TUBE COMPLEMENT AND BIAS ADJUSTMENT V3 BIAS POT V4 From left to right: V1: 12AX7/ECC83 (Input stage Bright and Normal channels) V2: 12AX7/ECC83 (stage 2 and tonestack cathode follower) V3L: 12AX7/ECC83 (phase inverter for power amplifier) V4-V5: EL34 (power tubes) V6: GZ34 (tube rectifier) BIAS ADJUSTMENT CONTROL IS INDICATED BY THE RED ARROW To measure your power tube bias, carefully follow these steps with the amplifier in...
- Page 10 5) Repeat step 4 for V5 through V7, moving to each responding red probe jack for each power tube. Write down your measurement for each To calculate bias, there are two pieces of information you need to know: your amplifier‟s power tube plate voltage, and the published value for maximum plate dissipation for the power tubes used in your amplifier.
- Page 11 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.
- Page 12 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 a buffered solid state type Can I substitute different tube types? - Although you can try 12AT7s, 12AU7s, 5751s without any harm, the design is optimized for 12AX7s, and are therefore the only recommended...
- Page 13 I invite you to study the circuits of other years, so you can try them! You can view the layouts of the other circuits for the Plexi 50 on the Ceriatone website. You can also mix and match these settings, to create your own sounds! Enjoy!
- Page 14 8) Settings templates Please resize, and print the templates below, to make your settings templates...