ETI Sound Systems, INC AT-212 User Manual
CAUTIONCAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
IMPORTANT SAFETY
INSTRUCTIONS!
1) Read these instructions.
2) Follow all instructions.
3) Keep these instructions.
4) Heed all warnings.
DO NOT turn on the AT-212 without the
5)
loudspeaker connected.
6) 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.
6) Clean only with dry cloth.
7) Do not block any ventilation openings and
operate in accordance with manufacturer’s
instructions.
8) Do not install near heat sources such as
radiators, stoves or other devices that may
produce heat.
9) 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.
10) Protect the power cord from being walked on
or pinched, particularly at the plug and the
point where it exits the AT-212 amplifier.
11) Only use attachments / accessories specified
by B-52 Professional.
12) Unplug the AT-212 during lightning storms
and when not in use.
13) 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.
14) To reduce the risk of fire or electric shock, do
not expose the AT-212 to rain or moisture.
15) Moisture can damage the AT-212 and can
cause corrosion of electrical contacts.
16) 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
17)
the AT-212 while it is connected to an
electrical outlet.
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INSIDE THIS INSTRUCTION MANUAL
Important Safety Instructions / Features.....2
Product Information.......................................3
AT-212 Controls..............................................4-5
Set-up & Warranty Information.....................5-7
Contact Information.......................................8
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.
l All-Tube Signal Path
l Tri-Mode Rectifier: Tube - Class A or AB,
Solid-State - Class AB
l Overdrive Channel: Gain 1 and Gain 2
Each with Independent Master Volumes,
3-Band EQ, Assignable Contour Control
l Clean Channel: Master Volume, 3-Band
EQ and Bright Switch
l Global Controls: Volume, Low-Res
(Resonance) and Reverb
l Effects Loop with Level Controls (Footswitchable)
l Line Out with Level Control
l Selectable 4 / 8 / 16 Ohms External Speaker Jacks
l 4-Position Footswitch: Channel, Gain,
Reverb and Effects Loop
l Ground Lift Switch
l Rugged 18mm Baltic birch construction
l Detachable casters for easy transport
l Dimenisons: 27” (W) x 11” (D) x 21” (H)
l Weight: 80lbs.
HEED ALL WARNINGS!
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 PROFESSIONALAT-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 Aand Solid State settings.
The AT-212 also features solid Baltic birch construction,detachable casters and a four function
heavy-duty footswitch.
AT-212 TUBES
Power Tubes: 4 x 6L6 / 5881
Preamp Tubes: 4 x 12AX7
Reverb Tube: 1 x 12AX7
Rectifier Tube: 1 x 5AR4
Effects Loop: 1 x 12AX7
Phase Inverter: 1 x 12AX7
CUSTOM B-52 TRANSDUCER
Power Handling: 120 watts
Freq. Response: 50-5K Hz
Nominal Impedance: 16 Ohms
Voice Coil Diameter: 2.5”
HEARING DAMAGE, PROLONGED EXPOSURE TO EXCESSIVE SPL
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.
AMPLIFIER MODULE PRECAUTIONS
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.
WARNING – SHOCK HAZARD:
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.
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