Users Guide for the
Users Guide for the
Bass Preamp
Bass Preamp
Ampeg
Ampeg® is Proudly Made in America
®
is Proudly Made in America
SVPCL Bass Preamp
2
Table of Contents
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
The Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
The Rear Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Some Suggested Settings . . . . . . . . . . . . . . . . . . . . . . . .6
Changing the Tubes . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
System Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . .7
Technical Specifications . . . . . . . . . . . . . . . . . .back cove
r
IMPORTANT SAFETY INSTRUCTIONS
• READ, FOLLOW, HEED, AND KEEPALL INSTRUCTIONS AND WARNINGS.
• DO NOTOPERATE NEAR ANYHEAT SOURCE AND DO NOT BLOCK ANY VENTILATION OPENINGS ON THIS APPARATUS. FOR PROPER OPERATION, THIS UNIT REQUIRES 3”
(75CM) OF WELL VENTILATED SPACE AROUND HEATSINKS AND OTHER AIR FLOW PROVISIONS IN THE CABINET.
• DO NOTUSE THIS APPARATUS NEAR SPLASHING, FALLING, SPRAYING, OR STANDING LIQUIDS.
• CLEAN ONLY WITH LINT-FREE DAMP CLOTH AND DO NOT USE CLEANING AGENTS.
• ONLY CONNECT POWER CORD TO A POLARIZED, SAFETY GROUNDED OUTLET WIRED TO CURRENT ELECTRICAL CODES AND COMPATIBLE WITH VOLTAGE, POWER, AND
FREQUENCY REQUIREMENTS STATED ON THE REAR PANEL OF THE APPARATUS.
• PROTECTTHE POWER CORD FROM DAMAGE DUE TO BEING WALKED ON, PINCHED, OR STRAINED.
• UNPLUG THE APPARATUS DURING LIGHTNING STORMS OR WHEN UNUSED FOR LONG PERIODS OF TIME.
• ONLY USE ATTACHMENTS, ACCESSORIES, STANDS, OR BRACKETS SPECIFIED BY THE MANUFACTURER FOR SAFE OPERATION AND TO AVOID INJURY.
• WARNING: TO REDUCE THE RISK OF ELECTRIC SHOCK OR FIRE, DO NOT EXPOSE THIS UNIT TO RAIN OR MOISTURE.
• SERVICE MUST BE PERFORMED BY QUALIFIED PERSONNEL.
• OUR AMPLIFIERS ARE CAPABLE OF PRODUCING HIGH SOUND PRESSURE LEVELS. CONTINUED EXPOSURE TO HIGH SOUND PRESSURE LEVELS CAN CAUSE PERMA-
NENT HEARING IMPAIRMENT OR LOSS. USER CAUTION IS ADVISED AND EAR PROTECTION IS RECOMMENDED IF UNIT IS OPERATED AT HIGH VOLUME.
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
WARNING: TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO NOT EXPOSE
THIS APPARATUS TO RAIN OR MOISTURE. TO REDUCE THE RISK OF ELECTRIC
SHOCK, DO NOT REMOVE COVER. NO USER-SERVICEABLE PARTS INSIDE. REFER
SERVICING TO QUALIFIED SERVICE PERSONNEL.
PRECAUCION
RIESGO DE CORRIENTAZO
NO ABRA
PRECAUCION: PARA REDUCIR EL RIESGO DE INCENDIOS O DESCARGAS ELECTRICAS, NO PERMITA QUE ESTE APARATO QUEDE EXPUESTO A LA LLUVIA O LA HUMEDAD. 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.
ATTENTION
RISQUE D'ELECTROCUTION
NE PAS OUVRIR
ATTENTION: PROTÉGEZ CET APPAREIL DE LA PLUIE ET DE L'HUMIDITÉ AFIN D'ÉVITER TOUT
RISQUE D'INCENDIE OU D'ÉLECTROCUTION. POUR REDUIRE D'ELECTROCUTION NE PAS ENLEVER
LE COUVERCLE. AUCUNE PIECE INTERNE N'EST REPRABLE PAR L'UTILISATEUR. POUR TOUTE
REPARATION, S'ADRESSER A UN TECHNICIEN QUALIFIE.
"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 D'UTILISATION"
EXPLANATION OF GRAPHICAL SYMBOLS:
EXPLICACION DE SIMBOLOS GRAFICOS:
EXPLICATION DES SYMBÔLES GRAPHIQUES:
"DANGEROUS VOLTAGE"
“VOLTAJE PELIGROSO”
"DANGER HAUTE TENSION"
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SVPCL Bass Preamp
3
An Introduction to your new Ampeg SVPCL Bass Preamplifier:
The harmonically rich sound and legendary performance of the classic AMPEG SVT are redefined in the SVPCL.
This dynamic preamp delivers a thunderous unsurpassed quality, reliability and tonal flexibility, offering the classic
vibrance of tubes as well as contemporary features. The SVPCLhas the best of both worlds. It is true to the design
of an early-70’s SVT with the addition of modern tone-shaping and output selection.
All of the features and controls of your SVPCL Preamp are covered in detail within the pages of this user’s guide.
We recommend going over them before you use the preamp.
Features:
In the world of high performance bass amps, Ampeg’s SVT amplifiers stand alone. Keeping with true Ampeg tradi-
tion, the SVPCL Bass Preamp offers you more performance and flexibility than any other preamp in its class. Listed
below are some of the outstanding features of your new preamp: features which set it apart from the competition!
Additional information on these features can be found on the pages indicated.
• PAD SWITCH: A switchable input pad, this feature is perfect for basses with active electronics or very
“hot” pickups (page 4)
• MUTE SWITCH, TUNER OUTPUT JACK: Lets you cut the sound from the amp, letting you tune your
bass in private (page 4,5)
• 5-POSITION ULTRA LOW SWITCH: Five different settings for the Ultra Low provide the ultimate in bottom end response (page 4)
• ULTRA HIGH AND BRIGHT SWITCHES: Lets you tailor your high frequency response in many different
ways “with the touch of a button” (page 4)
• 5-POSITION MIDRANGE SELECTOR: Take your pick from the five center frequency points available to
get just the right midrange voice (page 4)
• TRANSFORMER BALANCED LINE OUTPUT: Lets you send a high quality line level signal to the house
mixing board, a recording console, or another amplifier - switchable for pre or post EQ with switchable
ground lift (page 5)
4
SVPCL Bass Preamp
1. INPUT: Connect your instrument
here by means of a shielded instrument cable.
2. PAD: This switch, when depressed,
attenuates the input signal by 10dB.
Attenuation allows the Gain control
(#4) to be used at a higher setting. If
clipping is indicated with the Gain control close to fully counter clockwise,
attenuation is needed.
3. MUTE: This switch, when
depressed, mutes the signal at all outputs except the Tuner Output (#21).
4. GAIN: Use this control to adjust the
level of the signal going into the preamp. For the best signal to noise ratio,
set this control so the Peak LED (#5)
flashes occasionally during loud passages.
5. PEAK: This LED flashes when the
signal level into the preamp approaches clipping. When the Mute switch (#3)
is depressed, this LED remains illuminated as a visual indicator that the
Mute function is active.
6. ULTRA LOW: Use this five-position
rotary switch to select a setting for the
ultra low control, as follows:
1:Off – flat frequency response
2:Sub Cut – reduces frequencies
below the bass range to protect
the speakers
3:Low Cut Classic – provides a low
cut equal to the original SVT
4: Ultra Low Classic – contours the
sound to emphasize the low end
just like the original SVT
5:Ultra Low Modern – provides a
substantial low end boost
7. ULTRA HIGH: This switch, when
depressed, adds about a 16dB boost
to the high frequencies around 8kHz,
depending on the setting of the Gain
control (#4).
8. BRIGHT: This switch, when depressed, adds a 6dB boost to the high
frequencies at 3kHz.
9. BASS: Use this control to adjust the
low frequency output level. This control
provides +17/-13dB at 20Hz.
10. MID: Use this control to adjust the
midrange frequency output level. This
control provides +/-20dB at the frequency selected by the Mid freq control (#11).
11. MID FREQ: Use this control to
select the center frequency for the Mid
control (#10), as follows:
1: 220Hz
2: 450Hz
3: 800Hz
4: 1.6kHz
5: 3kHz
12. TREBLE: Use this control to adjust
the high frequency output level. This
control provides +18/-20dB at 7kHz.
13. MASTER: Use this control to
adjust the overall output level of the
preamp.
14. POWER: Use this switch to turn
the preamp on (top of the switch
depressed) and off (bottom of the
switch depressed). The adjacent
Ampeg logo illuminates green when
the preamp is on and the tubes are
warmed up.
The Front Panel:
1 2 3 7 84 5 6 9 10 11 12 13 14
5
SVPCL Bass Preamp
15. AC LINE IN: Firmly insert the
female end of the supplied AC power
cord into this socket. The grounded
power cord should only be plugged
into a grounded power outlet that
meets all applicable electrical codes
and is compatible with the voltage,
power, and freqency requirements
stated on the rear panel.
16. FOOTSWITCH: Use this jack to
connect the mono plug of a single button footswitch for remote control of the
Mute function.
17. PREAMP OUTPUT: Use these
jacks to send the output signal to the
input jacks of your power amplifier.
18. PRE/POST: Use this switch to
select either a Pre or Post EQ signal at
the Line Output jack (#20). When this
switch is depressed, the signal is Post
EQ and is affected by the settings of
the front panel tone controls. With this
switch in the out position the signal is
Pre EQ, taken directly after the first
tube stage.
19. GND LIFT/GND: When this switch
is in the out position, the chassis
ground at the Line Output jack (#20) is
electronically disconnected. This helps
reduce hum in the Line Output signal.
20. TRANSFORMER BALANCED LINE
OUTPUT: Use this jack to send a line
level signal from the preamp to a
house mixing board, recording console, or external amplifier.
21. TUNER OUTPUT: Use this jack to
send a signal to an electronic tuner.
When the Mute function is engaged
(#3, #16), the signal at this jack is unaffected and remains present, allowing
for silent tuning during a performance.
The Rear Panel:
171615 18 19 20 21
SVPCL Bass Preamp
6
Some Suggested Settings:
FUNK:
JAZZ:
ROCK:
COUNTRY:
The setting of the
Gain control
depends on your
particular instrument.
The Master should
be set to produce
the appropriate
output volume level.
SVPCL Bass Preamp
7
Changing the Tubes:
Tube wear is in direct proportion to how often and how hard you play. Preamp tubes aren’t worked as hard as power
tubes and typically last longer. When a preamp tube wears out, the preamp may squeal, get noisy, lose gain and sensitivity , or just quit working. Aservice center can determine which tube(s) may need replacing. T o get to the tubes in the SVPCL,
the top must be removed. This should be left to a qualified service person.
System Block Diagram:
INPUT
PAD
ULTRA LOW
TUNER
OUTPUT
GAIN
ULTRA
HIGH
MUTE
PEAK
BASS TREBLE
MID
PRE
POST
MASTER
MID FREQ.
MUTE
BUFFER
TRANSFORMER
BALANCED LINE
OUTPUT
GND
LIFT
PREAMP
OUTPUT
PREAMP
OUTPUT
Ampeg reserves the right to change specifications without notice.
Ampeg is proudly Made in America. ©2004 SLM Electronics, 1400 Ferguson Avenue, St. Louis, MO 63133 U.S.A.
P/N 47-836-01 • 012704
SVPCL Bass Preamp
www.ampeg.com
Technical Specifications
TONE CONTROL RANGE
ULTRA LOW: 1 = off; 2 = -3dB @ 30Hz; 3 = -3dB @ 200Hz; 4 = -20dB @ 600Hz; 5 = +9dB @ 30Hz
ULTRA HIGH: +16dB @ 8kHz
BRIGHT: +6dB @ 3kHz
BASS: +17dB / -13dB @ 20Hz
MID FREQ: +/-20dB @ 220Hz, 450Hz, 800Hz, 1.6kHz, or 3kHz
TREBLE: +15dB / -20dB @ 7kHz
GAIN 23dB
SIGNAL TO NOISE RATIO 80dB typical
TUBE COMPLEMENT (2) 12AX7, (2) 12AU7
POWER REQUIREMENTS 120VAC, 60Hz, 25VA
100/120VAC, 50/60Hz, 25VA
220-240VAC, 50/60Hz, 25VA
SIZE (W x H x D) AND WEIGHT 19” W x 1.75” H x 9.25” D, 9 lbs.
Declaration Of Conformity
#36, Effective 01-01-2001
Manufacturer’s Name: SLM Electronics
Production Facility: 1901 Congressional Drive, St. Louis, MO 63146, USA
Production Facility: 700 Hwy 202 W, Yellville, AR 72687, USA
Shipping Facility: 1400 Ferguson Ave., St. Louis, MO 63133, USA
Office Facility: 1400 Ferguson Ave., St. Louis, MO 63133, USA
Product Type: Audio Amplifier
Complies with the following Standards:
Safety: EN60065, E60065, C22.2, UL6500 and/or UL813
EMC: Directive 89/336/EEC, EN55103, EN55013, EN61000,
and/or FCC 47CFR 15B clA
Supplementary information provided by:
SLM Electronics - R & D Engineering
1901 Congressional Drive, St Louis, MO 63146, USA
Tel.: 314-569-0141, Fax: 314-569-0175
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