Ampeg Guitar Amplifier J12T User Manual

							J-12T TECHNICAL SPECIFICATIONS
OUTPUT POWER RATING15 Watts RMS @ 5 % THD 8 ohm load 120 VAC
SIGNAL TO NOISE RATIO70dB Typical
POWER REQUIREMENTSDomestic: 750mA, 100/120 VAC, 60 Hz 
Export: 375mA, 220/240 VAC, 50 Hz 
GAIN62 dB 
TONE30 dB Boost and Cut @ 4 kHz  
SPEAKER SPECS12”, 20 w, 8 ohm, 1” voice coil diameter, 15 oz. magnet
SIZE AND WEIGHT18.75” W x 16” H x 10” D
30 lbs.
THIS EQUIPMENT HAS BEEN DESIGNED AND ENGINEERED TO PROVIDE SAFE AND RELIABLE OPERATION. IN ORDER TO PROLONG THE LIFE OF
THE UNIT AND PREVENT ACCIDENTAL DAMAGES OR INJURY, PLEASE FOLLOW THESE PRECAUTIONARY GUIDELINES:
CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK, DO NOT OPEN CHASSIS; DO NOT DEFEAT OR REMOVE THE GROUND PIN OF THE POWER
CORD;  CONNECT ONLY TO A PROPERLY GROUNDED AC  POWER  OUTLET.
WARNING:TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE.
CAUTION: NO USER-SERVICEABLE PARTS INSIDE. REFER SERVICING TO QUALIFIED SERVICE PERSONNEL.
CAUTION: IF YOU USE AUDIO AMPLIFIERS PROFESSIONALLY OR IN WORK RELATED SITUATIONS AS AN EMPLOYEE, THE OCCUPATIONAL SAFETY
AND HEALTH ADMINISTRATION (OSHA) HAS SPECIFIED REGULATIONS CONCERNING PROLONGED EXPOSURE TO HIGH SOUND PRESSURE LEV-
ELS. PLEASE REFER TO THE CODE OF FEDERAL REGULATIONS DOCUMENT 29CFR1910 FOR ADDITIONAL INFORMATION.
CAUTIONRISK OF ELECTRIC SHOCK
DO NOT OPEN
CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK,
DO NOT REMOVE COVER.
NO USER-SERVICEABLE PARTS INSIDE.
REFER SERVICING TO QUALIFIED SERVICE PERSONNEL.
ATTENTIONRISQUE DELECTROCUTION
NE PAS OUVRIR
ATTENTION: POUR REDUIRE DELECTROCUTION NE PAS
ENLEVER LE COUVERCLE. AUCUNE PIECE INTERNE NEST REPRABLE
PAR LUTILISATEUR. POUR TOUTE REPARATION, SADRESSER A UN
TECHNICIEN QUALIFIE.
VORSICHTELEKTRISCHE SCHLAGGEFAHR
NICHT OFFENEN
VORSICHT: ZUR MINIMIERUNG ELEKTRISCHER SCHLAGGEFAHR NICHT
DEN DECKEL ABENHMEN. INTERNE TEILE KONNEN NICHT VOM
BENUTZER GEWARTET WERDEN. DIE WARTUNG IS QUALIFIZIERTEM
WARTUNGSPERSONAL ZU UBERLASSEN.
IT IS NECESSARY FOR THE USER TO REFER TO THE INSTRUCTION MANUAL
REFERREZ-VOUS AU  MANUAL DUTILISATION
UNBEDINGT IN DER BEDIENUNGSANLEITUNG NACHSCHLAGEN EXPLANATION OF
GRAPHICAL SYMBOLS:DANGEROUS VOLTAGE
DANGER HAUTE TENSION
GEFAHLICHE SPANNUNG=
=
Specs and other information subject to change without notice.
Ampeg is proudly Made in America. A product of SLM Electronics, 1400 Ferguson Avenue, St. Louis, MO 63133 U.S.A.
47-277-02 • 12-95
 









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							MODEL J-12T MODEL J-12T
GUITAR ACCORDION
VOLUME0 1 2345
6
7
8
9
10ON OFF
TONEB0 1 2345
6
7
8
9
10SPEED0 1 2345
6
7
8
9
10INTENSITY TREMOLO0 1 2345
6
7
8
9
10
JET II
TDIMENSIONREVERB0 1 2345
6
7
8
9
10123456789
Thank you for selecting the Ampeg Classic Jet guitar amplifier. Revived from the sixties and ready for the nineties, this easy-to-use
amplifier represents Ampeg’s quest to provide you the finest instrument amplification systems available. In order to get the most
out of your new amplifier, please read these instructions before its use. 
THEFRONTPANEL:
1. Guitar Input accepts a stan-
dard 1/4” instrument plug from
your electric guitar. This input is at
0dB level.
2. Accordion Inputaccepts a
standard 1/4” instrument plug from
high output electronic instruments.
This input is padded 6dB to com-
pensate for higher output sources.
3. Volumecontrols the overall out-
put level of the amplifier. At lower
volume settings the sound will be
clean. As you push the volume
higher and crank your guitar the
sound becomes distorted.
4. Tonecontrols the overall tonal
character of the amplifier. Rotating
the knob toward the “T” increases
the higher frequencies, giving a
brighter, more “crisp” sound.
Rotating the control towards the
“B” reduces the high frequencies,
giving a darker, more “muffled”
sound. The Tone control offers a
cut or boost of 30dB at 4kHz.5. Tremolo-Speed sets the rate at
which the tremolo effect “vibrates.”
The Tremolo-Intensity control (#6)
must be turned up to hear the
effects of this knob’s setting.
6. Tremolo-Intensitysets the
depth of the tremolo effect. For
slow, smoother vibrato effects try
the Intensity control at around 6
and the Speed control at 1. For the
really wild sounds, crank the
Intensity up towards 8 (or beyond)
and go from there.
7. Reverb-Dimension controls
the amount of reverberation
applied to the signal. With the con-
trol at the “0” position there is no
reverb applied; as the control is
turned towards “10” the amount of
reverb increases accordingly.
8. Power lightindicates the ampli-
fier is turned on by glowing an iri-
descent blue color.
9. Power switchis used to turn
the amplifier on and off.THE REAR
PANEL:
10. Power cordconnects the
amplifier to a suitable source of
A.C. voltage. This is a grounded,
three-wire cord and must be con-
nected to a properly grounded out-
let. DO NOT  attempt to defeat
the ground connection of the
power cord!If your amp was pur-
chased outside of the United
States, see the sticker next to the
A.C. connector for its power rat-
ings. Follow the above guidelines. 
11,12. Power Tubes:EL84 /
6BQ5 (2)
13. Power Amp Phase Splitter
Tube:12AX7A / 7025 (1)
14. Preamp Tube:12AX7A / 7025
(1)
Replace tubes ONLY with same
types! Refer to enclosed publica-
tion about Tubes and Tube
Amplifiers for additional informa-
tion.
The Front Panel:
1011121314
    

 
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yyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyy yyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyy yyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyy(Reverb cables:
do not disturb) (Reverb cables:
do not disturb)
The Rear Panel: