Ceriatone Chupacabra HRP Series User Manual Download | Manualshive

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10

5) TUBE COMPLIMENT AND EXTERNAL BIAS JACKS AND ADJUSTMENT

Chupacabra 50W

From left to right:

V1 – JJ 12AX7/ECC83S (input stage 1 and gain stage 2)

V2 – JJ 12AX7/ECC83S (gain stage 3 and tonestack driver)

V3 – JJ 12AX7/ECC83S (phase inverter for power amplifier)

V4 – JJ E34L
V5 – JJ E34L

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Summary of Contents for Chupacabra HRP Series

Page 1: ...1 Ceriatone Chupacabra HRP Series 50W amplifier User s Manual ...

Page 2: ...ra is a mythical creature known for its violent attacks on animals and penchant for drinking the blood of its victims Sounds evil right Well so does the amplifier at hand Don t let the name fool you though because it is capable of much more This amplifier particularly draws upon the lineage of famous 1980s amp technician Jose Arredondo but with modern twists and refinements We ve voiced the power ...

Page 3: ... 3 Plug the Chupa into your speaker cabinet using 1 4 speaker cable 4 Set the OUTPUT SELECTOR to the match the impedance of your speaker cabinet 5 Set all rotary controls on the front panel to 12 00 clock face 6 Set ERA control to the far right position 7 Set BRIGHT 1 and 2 to the far left positions 8 Set front panel POWER switch in the 1 position down position with adjacent STANDBY switch in the ...

Page 4: ...WER 2 way toggle switch 3 STANDBY 2 way toggle switch 4 RESONANCE control 5 PRESENCE control 6 BASS control 7 MIDDLE control 8 TREBLE control 9 MASTER control 10 ERA 3 way toggle switch 11 GAIN 2 control 12 BRIGHT 2 3 way toggle switch 13 GAIN 1 control 14 FOCUS push pull control located on GAIN 1 15 BRIGHT 1 3 way toggle switch ...

Page 5: ...o use the Chupa With the toggle switch in the UP position the Chupacabra is in STANDBY mode In the DOWN position the Chupacabra is in OPERATE mode RESONANCE adjusts the low frequency response of the power amplifier using negative feedback Use this control to add depth punch and thump to your tone PRESENCE adjusts the high frequency response of the power amplifier using negative feedback Use this c...

Page 6: ...of your Chupacabra BRIGHT 2 is a high frequency boost that can be used to add sparkle and gain to your tone In the middle position BRIGHT 2 is defeated In the left position it boosts upper mid and high frequencies and adds noticeable gain With the toggle switch in the right position it boosts extreme high frequencies and adds less gain boost than the right position In conjunction with an active Br...

Page 7: ... GAIN 1 With the control pushed in it is defeated Pulling out the GAIN 1 control engages FOCUS FOCUS will reduce bottom end reduce saturation increase midrange and accentuate pick attack INPUT is a jack for instrument cables Plug your guitar in here ...

Page 8: ...sing the power amplifier Conversely this is usually used as the SEND of the effects loop Plug the input of your effects unit or interface device ex C lator Klein ulator into this jack using instrument cable FX RETURN instrument jack can be used to directly interface the power amp of the Chupacabra thereby bypassing the preamp and using the amplifier as a power amplifier Conversely this is usually ...

Page 9: ... you are using two speaker cabinets in parallel ex two 16 Ohm cabinets set the impedance selector to half that of a single cabinet in this case 8 Ohms BIAS TEST multimeter probe jacks use this for external bias current measurements see Section 5 Page 10 MAINS FUSE slow blow fuse used to protect your amplifier from voltage spikes or excessive current draw Replace only when necessary 3A is used for ...

Page 10: ...IAS JACKS AND ADJUSTMENT Chupacabra 50W From left to right V1 JJ 12AX7 ECC83S input stage 1 and gain stage 2 V2 JJ 12AX7 ECC83S gain stage 3 and tonestack driver V3 JJ 12AX7 ECC83S phase inverter for power amplifier V4 JJ E34L V5 JJ E34L ...

Page 11: ...adjustment potentiometer shaft V4 3 Black arrow black probe jack ground COM 4 Orange arrow red probe jack V5 5 Blue arrow bias adjustment potentiometer shaft V5 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 ...

Page 12: ...n arrow and insert into V5 red probe jack orange arrow This measures bias for V5 7 Adjust V5 bias adjustment blue arrow SLOWLY until your DMM reads approximately 36mV see calculations below 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 13: ...ing price of NOS matched power tubes this is an effective way at saving some money just purchase individual tubes and match them to your amplifier yourself A FEW COMMENTS ON BIASING Due to the nature of vacuum tube amplification there are inherent risks when biasing your amplifier Extremely high voltages are present and vacuum tubes reach high temperatures during use The risk of electrical shock a...

Page 14: ...X loop Stay tuned 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 Most rack mount units have different input impedance than pedals and thus can sometimes function fine without a buffer before them...

Page 15: ...If this is an issue you can simply turn off BRIGHT 2 or decrease gain settings or turn down your guitar volume during breaks If you need all of that gain and then some we recommend a noise gate standard procedure on any modern high gain amplifier However if you are a straight to amp player we have installed a trimmer aptly named PUSSY TRIMMER The amp is sent from our test bench with it at its maxi...

Page 16: ...al Can this amp do that Hell yeah Put Gain 1 at 1 30 Gain 2 at 11 00 Both BRIGHT switches to the left Select ERA in the left modern position Turn the MASTER up to about 3 00 Start with BASS around 9 30 MIDRANGE around 11 00 TREBLE around 2 00 PRESENCE around 11 00 and RESONANCE around 1 00 Make sure your neck is properly stretched beforehand Sorry I just want to rock Classic like Can this amp do t...

Page 17: ...ition resistors 1W carbon film resistors Mallory 150M polyester film capacitors high voltage silver mica capacitors Belton tube sockets and Alpha potentiometers Cliff jacks Finally we occasionally use 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 ...

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