Ampeg Guitar Amplifier SJ12R User Manual

							 















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							BASS0 1 2345
6
7
8
9
10DIMENSIONREVERB0 1 2345
6
7
8
9
10
MODEL SJ-12R MODEL SJ-12R
GUITAR ACCORDION
VOLUME0 1 2345
6
7
8
9
10ON OFF
TREBLE0 1 2345
6
7
8
9
10
SUPERJET
MID0 1 2345
6
7
8
9
101234567 89
THEFRONTPANEL:
1. Guitar Input accepts a
standard 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 elec-
tronic instruments. This input
is padded 6dB to compen-
sate for higher output
sources.
3. Volumecontrols the over-
all output level of the amplifi-
er. At lower volume settings
the sound will be clean. As
you push the volume higher
and crank your guitar the
sound becomes distorted.
4. Trebleadjusts the output
level of the high frequency
and offers a cut or boost of
12dB at 6kHz.
5. Mid adjusts the output
level of the middle frequency
and offers a cut or boost of
16dB at 800Hz.6. Bassadjusts the output
level of the low frequencies
and offers a cut or boost of
24dB at 50Hz.
7. Reverb-Dimension con-
trols the amount of reverber-
ation applied to the signal.
With the control 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
amplifier is turned on by
glowing an iridescent 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 connected
to a properly grounded out-
let. DO NOT attempt to
defeat the ground connec-tion of the power cord!If
your amp was purchased
outside of the United States,
see the sticker next to the
A.C. connector for its power
ratings. Follow the above
guidelines. 
11,12. Power Tubes:EL34 /
6CA7 (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 publication about
Tubes and Tube Amplifiers
for additional information.
15: Footswitch Jackis
located up inside the amplifi-
er, just past the cabinet’s
covered back panel. Connect
the supplied footswitch here
for control of the Reverb
on/off and a switchable 15dB
of gain from 250Hz to 8kHz.
Thank you for selecting the Ampeg Classic SuperJet guitar amplifier. Inspired by the classic
Ampeg guitar amps of the sixties, 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.  
						

							THIS EQUIPMENT HAS BEEN
DESIGNED AND  ENGINEERED
TO PROVIDE SAFE AND RELI-
ABLE OPERATION. IN ORDER
TO PROLONG THE LIFE OF THE
UNIT AND PREVENT ACCIDEN-
TAL DAMAGES OR INJURY,
PLEASE FOLLOW THESE PRE-
CAUTIONARY 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 MOIS-
TURE.
CAUTION:NO USER-SERVICE-
ABLE PARTS INSIDE. REFER
SERVICING TO QUALIFIED SER-
VICE PERSONNEL.
CAUTION:OUR AMPLIFIERS
ARE CAPABLE OF PRODUCING
HIGH SOUND PRESSURE LEV-
ELS. CONTINUED EXPOSURE
TO HIGH SOUND PRESSURE
LEVELS CAN CAUSE PERMA-
NENT HEARING IMPAIRMENT
OR LOSS. USER CAUTION IS
ADVISED AND EAR PROTEC-
TION IS RECOMMENDED IF
UNIT IS OPERATED AT HIGH
VOLUME.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.
IT IS NECESSARY FOR THE USER TO REFER TO THE INSTRUCTION MANUAL
“ES NECESARIO QUE EL USUARIO SE REFIERA AL MANUAL DE INSTRUCCIONES.”
REFERREZ-VOUS AU MANUAL DUTILISATION
UNBEDINGT IN DER BEDIENUNGSANLEITUNG NACHSCHLAGENEXPLANATION OF GRAPHICAL SYMBOLS:
EXPLICACION DE SIMBOLOS GRAFICOS:
EXPLICATION DES SYMBÔLES GRAPHIQUES:DANGEROUS VOLTAGE
“VOLTAJE PELIGROSO”
DANGER HAUTE TENSION
GEFAHLICHE SPANNUNG==
PRECAUCIONRIESGO DE CORRIENTAZO
NO ABRA
PRECAUCION PARA DISMINUOIR EL RIESGO DE CORRIENTAZO
NO ABRA LA CUBIERTA
NO HAY PIEZAS ADENTRO QUE EL USARIO PUEDO REPARAR
DEJE TODO MANTENIMIENTO A LOS TECHNICOS CALIFICADOS
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.
ESTE APARATO  HA SIDO  DISE-
NADO Y CONSTRUIDO PARA
PROVEER ANOS DE OPERA-
CION SEGURA Y CONFIABLE.
PARA PROLONGAR LA VIDA DE
ESTA UNIDAD E IMPEDIR
DANOS ACCIDENTALES  POR
FAVOR SIGA ESTAS INSTRUC-
CIONES PREVENTIVAS:
PRECAUCION:PARA DISMINUIR
EL RIESGO DE DESCARGAS
ELECTRICAS: (1) NO ABRA LA
CUBIERTA, (2) NO ES
RECOMENDABLE REMOVER O
DESACTIVAR LA PATA DEL
POLO A TIERRA DEL CABLE  DE
CORRIENTE, CONECTE COR-
RECTAMENTE A UNA TOMA DE
CORRIENTE A TIERRA.
ADVERTENCIA:PARA EVITAR
DESCARGAS EL ECTRICAS O
PELIGRO DE INCENDIO, NO
DEJE ESTE APARATO
EXPUESTO A LA LLUVIA O
HUMEDAD.
PRECAUCION: NO HAY PIEZAS
ADENTRO QUE EL USUARIO
PUEDE REPARAR. DEJE TODO
MANTENIMIENTO A LOS TÉCNI-
COS CALIFICADOS.
PRECAUCION:NUESTROS
AMPLIFICADORES PUEDEN
PRODUCIR NIVELES DE PRE-
SION DE SONIDO ALTO.
EXPOSICION CONTINUADA A
LOS NIVELES DE PRESION DE
SONIDO ALTO PUEDE CAUSA
DANO PERMANENTE A SU
OIDO. ES ACONSEJADO QUE
USE PRECAUCION AL USUARIO
Y ES RECOMENDADO PROTEC-
CION PARA LOS OIDOS SI LA
UNIDAD ES OPERADA A VOLU-
MEN ALTO.CET ÉQUIPEMENT AVAIT ÉTÉ
INVENTÉ ET ARRANGÉ POUR
POURVOIR DES ANNÉES
DUSAGE SAUF ET SÛR.  POUR
PROLONGER LA VIE DE CET
APPAREIL ET POUR EMPÊCHER
LES DOMMAGES ET LES TORTS
ACCIDENTELS, SUIVEZ LES
INSTRUCTIONS DE PRÉCAU-
TION.
AVERTISSEMENT:POUR
RÉDUIRE LES RISQUES DÉLEC-
TROCUTION: (1)  N’OUVREZ
PAS LE CHÂSSIS, (2)  NE PAS
ESSAYER DE SUPPRIMER LA
BROCHE CORRESPONDANT À
LA TERRE.
ATTENTION: POUR RÉDUIRE
LES RISQUES DUN FEU OU
DÉLECTROCUTION, N’EX-
POSEZ PAS LAPPAREIL À LA
PLUIE OU À LA MOITEUR.
ATTENTION:IL NY A PAS
D’ÉLÉMENTS RÉPARABLES
DANS LAPPAREIL.  CONSULTER
UN TECHNICIEN QUALIFIÉ
POUR LES RÉPARATIONS.
ATTENTION:NOS AMPLIFICA-
TEURS SONT CAPABLES DE LA
PRODUCTION DES NIVEAUX DE
SON DUNE HAUTE PRESSION.
LEXPOSITION CONTINUE AUX
CES NIVEAUX PEUT CAUSER
LA SURDITÉ PERMANENTE.  LA
PRUDENCE EST ADVISÉ À UTIL-
ISATEUR ET LA PROTECTION
DES OREILLES EST RECOM-
MANDÉ SI LAPPAREIL EST
UTILISÉ À UN HAUT NIVEAU DE
VOLUME.
The SJ-12R is covered with a durable Tolex material: wipe it clean with a lint-free cloth. Never
spray cleaning agents onto the cabinet. Avoid abrasive cleansers which would damage the finish.
El SJ-12R esta cubierto con un material durable Tolex: limpielo con una toalla seca. Nunca rocie
el gabinete con sustancias limpiadoras. Evite usar materiales abrasivos con los cuales
pueda danar el acabado.
Le SJ-12R est couvert avec «Tolex» un revêtement noir et durable.  Essuyez cette matière avec
une toile propre et sans charpie.  Ne pulvérisez jamais les agents de nettoyage sur lappareil.
Evitez les nettoyeurs abrasifs qui peuvent endommager le «Tolex.» 
						

							Ampeg is proudly Made in America.
A product of SLM Electronics, 1400 Ferguson Avenue, St. Louis, MO 63133 U.S.A.
SJ-12R TECHNICAL SPECIFICATIONS:
OUTPUT POWER RATING50 Watts RMS @ 5 % THD 8 ohm load 120 VAC
SIGNAL TO NOISE RATIO70dB Typical
POWER REQUIREMENTSDomestic: 100/120 VAC, 60 Hz, 2A Slo Blow fuse 
Export: 220/240 VAC, 50 Hz, 1A Slo Blow fuse 
GAIN69dB 
TREBLE12dB Boost and Cut @ 6kHz 
MID16dB Boost and Cut @ 800Hz 
BASS24dB Boost and Cut @ 50Hz
SPEAKER SPECS12”, 50 w, 8 ohm, 1.5” voice coil diameter, 34 oz. magnet
SIZE AND WEIGHT21” W x 17” H x 10.25” D
40 lbs.
Ampeg continually develops new products, as well as improves existing ones. For this reason,
the specifications and information in this manual are subject to change without notice.
Ampeg continuamente desarrolla nuevos productos, así como también mejora los existentes. Por esta razón,
las especifaciones é información incluidos en este manual están sujetos a cambios sin previo aviso.
Ampeg développe continuellement des nouvels produits, ainsi daméliorer ceux qui existe.  Pour cette
raison les spécifications et les informations dans ce manuel peuvent se changer sans préavis.
P/N 47-277-12 • 03/96