IMPORTANT SAFETY INSTRUCTIONS! 1) 2) 3) 4) 5) Read these instructions. Follow all instructions. Keep these instructions. Heed all warnings. DO NOT turn on the AT-212 without the loudspeaker connected. Do not use the AT-212 near water. Be extra cautious when moving the AT-212 during rain or while transporting it over wet surfaces as water might splash onto the amplifier. Clean only with dry cloth. Do not block any ventilation openings and operate in accordance with manufacturer's instructions. Do not install near heat sources such as radiators, stoves or other devices that may produce heat. Do not defeat the safety purpose of the polarization or grounding-type plug. A polarized plug has two blades with one wider than the other. A grounding-type plug has two blades and a third grounding prong. The wide blade or the third prong is provided for your safety. If the provided plug does not fit your outlet, consult an electrician for replacement of the obsolete outlet. Protect the power cord from being walked on or pinched, particularly at the plug and the point where it exits the AT-212 amplifier. Only use attachments / accessories specified by B-52 Professional. Unplug the AT-212 during lightning storms and when not in use. Refer all servicing to qualified personnel. Servicing is required when the AT-212 has been damaged in any way such as when power-cord or plug is damaged, liquid has been spilled into the amplifier, the unit has been exposed to moisture or rain, does not operate normally, or has been dropped. To reduce the risk of fire or electric shock, do not expose the AT-212 to rain or moisture. Moisture can damage the AT-212 and can cause corrosion of electrical contacts. Keep the unit out of extended or intense direct sun light. No containers filled with any type of liquid should be placed on or near the AT-212. Never remove the front or rear panels of the AT-212 while it is connected to an electrical outlet. Important Safety Instructions / Features .....2 Product Information .......................................3 AT-212 Controls ..............................................4-5 Set-up & Warranty Information .....................5-7 Contact Information .......................................8 INSIDE THIS INSTRUCTION MANUAL 6) 6) 7) 8) 9) AT-212 ALL-TUBE COMBO This AT-212 is a 3-channel, all-tube, tri-mode rectified combo that gives you unparalleled tone and astounding versatility. The clean channel yields sparkling vintage tone that stays clean even at high volume. The overdrive section features 2 independent high-gain channels and independent volume controls with a shared 3-band EQ. The assignable contour (mid-scoop) control gives you the ability to make each overdrive channel sound radically different. The Global section features Low-Res (Resonance), Reverb and Master Volume. All-Tube Signal Path Tri-Mode Rectifier: Tube - Class A or AB, Solid-State - Class AB Overdrive Channel: Gain 1 and Gain 2 Each with Independent Master Volumes, 3-Band EQ, Assignable Contour Control Clean Channel: Master Volume, 3-Band EQ and Bright Switch Global Controls: Volume, Low-Res (Resonance) and Reverb Effects Loop with Level Controls (Footswitchable) Line Out with Level Control Selectable 4 / 8 / 16 Ohms External Speaker Jacks 4-Position Footswitch: Channel, Gain, Reverb and Effects Loop Ground Lift Switch Rugged 18mm Baltic birch construction Detachable casters for easy transport Dimenisons: 27" (W) x 11" (D) x 21" (H) Weight: 80lbs. 10) 11) 12) 13) 14) 15) 16) 17) HEED ALL WARNINGS! CAUTION RISK OF ELE TRIC SH C OCK DO NOT OPEN 2 WARNING: To reduce the risk or fire or electrical shock do not expose this equipment to rain or moisture. AT-212 100-WATT ALL-TUBE 2x12" COMBO! THANK YOU FOR CHOOSING THE B-52 PROFESSIONAL AT-212 COMBO! The B-52 AT-212 is a feature-laden all-tube 2 x 12" open-backed combo with 100 relentless watts ripping through two custom-built B-52 loudspeakers. The AT-212's foundation is outstanding tone, versatility and power. Each channel - Clean and Overdrive - has its own set of gain, treble, mid and bass equalization controls for maximum flexibility. The Clean Channel goes from classic sparkle to serious crunch while the Overdrive Channel features two independent gain options. Gain 1 moves from bluesy grit all the way to metallic shred. Gain 2 takes over where Gain 1 leaves off for the most intense gain ever.. The assignable contour control "scoops" the all important mids, effectively producing the ultimate metal tone or, when switched out, creates the warm, full bodied tones of the great classic amps. A three position rectifier switch adds even more versatility, offering Tube ClassAB1, Tube Class A and Solid State settings. The AT-212 also features solid Baltic birch construction,detachable casters and a four function heavy-duty footswitch. Power Tubes: Preamp Tubes: Reverb Tube: Rectifier Tube: Effects Loop: Phase Inverter: AT-212 TUBES 4 x 6L6 / 5881 4 x 12AX7 1 x 12AX7 1 x 5AR4 1 x 12AX7 1 x 12AX7 CUSTOM B-52 TRANSDUCER Power Handling: Freq. Response: Nominal Impedance: Voice Coil Diameter: 120 watts 50-5K Hz 16 Ohms 2.5" B-52 Professional amplifiers and speakers, including the AT-212, are capable of producing sound pressure levels (SPL) sufficient to cause permanent hearing damage to performers, production crews or people in the audience. Hearing protection devices such ear-plugs are recommended. Caution should be taken to avoid extended SPL is excess of 90 dBA. Do not attempt to service the AT-212 by yourself. Refer all servicing to a B-52 Stealth Series Authorized dealer. Service is required when the AT-212 has had liquid spilled on or inside the unit, has been damaged in any way, has been exposed to rain or moisture, does not operate normally or has been dropped. To reduce the risk of fire or electrical shock, do not expose this unit to rain or moisture. Do not operate your AT-212 near a pool or other standing water. Make sure all blades on the polarized power plug are fully inserted into the power source. Ensure the power cord is not stretched, pinched or otherwise abused. Ensure the power cord is routed to avoid foot traffic. Your AT-212 amplifier should be cleaned only with a dry cloth. HEARING DAMAGE, PROLONGED EXPOSURE TO EXCESSIVE SPL AMPLIFIER MODULE PRECAUTIONS WARNING ­ SHOCK HAZARD: 3 AT-212 - CONTROLS AND FEATURES 1. 2. 3. 4. 5. 6. LOW/HIGH INPUTS: Plug your guitar in here. Use the input that best suits your playing style. Most players use the High input for maximum gain. For a cleaner sound, use the Low input. Always use a high quality, shielded instrument cable. OVERDRIVE CHANNEL ­ GAIN 1: Adjusts the amount of distortion in Gain 1. (Activated LED indicates in use). OVERDRIVE CHANNEL ­ GAIN SWITCH: Push switch Selects between Gain 1 and Gain 2 controls. Activated LED lights indicate which channel is currently use. OVERDRIVE CHANNEL ­ GAIN 2: Adjusts the amount of distortion in Gain 1. (Activated LED indicates in use). OVERDRIVE CHANNEL ­ BASS: Adjusts the amount of low frequency boost or cut as desired in the overdrive channel. Bass is B-52's signature. Turning this control clockwise increases depth and low-end punch to your music. OVERDRIVE CHANNEL ­ MIDDLE: Adjusts the amount of 7. 8. 9. 10. 11. 12. 13. 14. 15. To reduce the risk of fire or electrical shock, do not expose this unit to rain or moisture. Do not operate your AT-212 near a pool or other standing water. Make sure all blades on the polarized power plug are fully inserted into the power source. Ensure the powercord is not stretched, pinched or otherwise abused. Ensure the power cord is routed to avoid foot traffic. Your AT-212 amplifier should be cleaned only with a dry cloth. WARNING: SHOCK HAZARD! mid-range frequencies as desired in the overdrive channel. Similar to the Clean Channel function, the O.D. Channel Middle control adds body and punch to your sound. OVERDRIVE CHANNEL ­ TREBLE: Adjusts the amount of high frequency boost or cut as desired in the overdrive channel. Turning this control clockwise adds clarity to your sound. OVERDRIVE CHANNEL ­ GAIN SWITCH 1: Activates the CONTOUR control for Gain 1. OVERDRIVE CHANNEL ­ CONTOUR: Varies the critical midrange tone in the overdrive channels. Adjusts from "classic" midrange punch to "scooped metal" madness. OVERDRIVE CHANNEL ­ GAIN SWITCH 2: Activates the CONTOUR control for Gain 2. OVERDRIVE ­ VOLUME 1: Controls the overall volume of the medium gain overdrive channel. OVERDRIVE ­ VOLUME 2: Controls the overall volume of the high gain overdrive channel. CHANNEL SELECT: Push switch selects between the clean and overdrive channels. Activated LED lights indicate which channel is in use. CLEAN CHANNEL - BASS: Adjusts the amount of low frequency boost or cut as desired. Adding bass will increase the depth and fullness of your sound. CLEAN CHANNEL - MIDDLE: Adjusts the amount of mid-range 4 26. AC INLET & PRIMARY FUSE: Connects AC powercord and houses primary fuse. Always use correct value as indicated on amp panel chart. 27. POWER TUBE FUSE: This fuse protects the AT-212 against circuit damage caused by a power tube failure. Only replace with a 1 AMP Fast Blo (never Slo Blo) fuse. 28. 3-SETTING RECTIFIER SWITCH: SOLID-STATE ­ Gives tightest low-end definition and fastest attack. TUBE AB1 ­ Punchy, warm and tighter definition than Tube A. TUBE A ­ "Vintage" attack and feel. Warmest sounding setting. 29. GROUND / LIFT SWITCH: Removes ground from the circuit to eliminate 60-cycle hum. 30. LOUDSPEAKER OUTPUTS: Connects the AT-212 to the speaker cabinets such as the AT-412A or AT-412B. 31. IMPEDANCE SELECTOR SWITCH: Allows the AT-212 to safely operate into any 4 ohm, 8 ohm or 16 ohm cabinets(s). NOTE: Always set the switch to match the impedance of your cabinet(s). NOTE: Always be sure the speakers are plugged in before attempting to operate the amplifier. Always use a high quality, heavy duty, unshielded speaker cable. Severe damage can occur from failing to connect the speakers and properly setting the impedance selector switch. AT-212: CONTROLS AND FEATURES 16. 17. 18. 19. 20. 21. frequencies as desired in the clean channel. Turning the middle control clockwise will increase the amount of warmth in your tone. Counterclockwise settings create a more pristine, acoustic kind of sound. CLEAN CHANNEL - TREBLE: Adjusts the amount of high frequency boost or cut as desired in the clean channel. Treble adds brightness to your tone. Turning this control clockwise will add brilliance to your sound. Turning the control counterclockwise softens the tone. CLEAN CHANNEL - BRIGHT: Adds high end sparkle. CLEAN CHANNEL ­ VOLUME: Controls the overall signal level of the clean channel.Adjusting the volume control enables you to produce sparkling clean sounds to crunchy, dirty blues. Turned all the way to the left you will experience clean sounds. A setting all the way to the right will produce moderate levels of distortion. MASTER VOLUME: Controls the overall signal level of the AT-212. To increase the overall signal and/or volume, rotate the control clockwise. The Master volume control allows you to preset the output levels of both the Clean and Overdrive Channels. MASTER LOW RESONANCE: Controls the overall resonance of the amplifier. Turning the control clockwise adds rich low end. MASTER REVERB CONTROL: Adjusts the amount of reverb produced by the amplifier. To increase the amount of reverb turn clockwise. 22. PILOT JEWEL. Power on indicator. 23. STANDBY ON/OFF SWITCH: Allows the AT-212 to remain turned ON for limited periods of inactivity without the risk of damaging / over-heating the amplifier tubes. When the Standby switch is in the STANDBY position the AT-212 is in a nonoperational setting. When in Standby the Sovtek tubes remain hot and ready for use. This bypasses the time required for the tubes to warm up before use. When the Standby switch is in the ON position the AT-212 is operational and should not be left inactive. DO NOT turn on the AT-212 or have the Standby switch set to ON without it connected to a loudspeaker. 24. POWER ON/OFF SWITCH: Turns the AT-212 on and off. Do not attempt to service the AT-212 by yourself. Refer all servicing to a B-52 Authorized dealer. Service is required when the AT-212 has had liquid spilled on it or has been damaged in any way, the amplifier has been exposed to rain or moisture, does not operate normally or has been dropped. AMPLIFIER PRECAUTIONS 32. LINE OUT LEVEL CONTROL: Controls the output capacity of the Line Out Level. 33. LINE OUT JACK: Connects the AT-212 to an external linelevel device such as a mixing board. 34. FOOTSWITCH - EFFECTS/REVERB: Connects footswitch to turn the reverb on/off and the effects loop on/off. 35. FOOTSWITCH ­ GAIN AND CHANNEL SWITCH: Switch between Gain 1 and Gain 2 in the overdrive Channel. Also switches between clean and overdrive channel. 36. EFFECTS ­ RETURN JACK: Connects the AT-212 to the ou ...