Ampeg Bass heads SVT2PRO User Manual

							Owners Guide for the Owners Guide for the
Ampeg® is Proudly Made in America Ampeg® is Proudly Made in America
Bass Amplifier Bass Amplifier
-15dB PAD
MUTEPEAK /
  MUTEULTRA LO
BRIGHTULTRA HI
GRAPHIC EQ
MASTER TREBLE FREQUENCY MIDRANGE BASS DRIVE GAIN INPUTPOWER STANDBY
-12dB 0 +12dB
-10dB 0 +8dB40Hz 90Hz 180Hz 300Hz 500Hz 1kHz 2kHz 4kHz 10kHz LEVEL
ACTIVE / PEAK  
						

							2Important Safeguards and Precautions:
All Ampeg products are designed for continuous safe operation, as long as common sense is used and steps are taken to
help avoid certain problems. Abiding by the following rules can help prevent damage to your preamp, yourself and others.
•The amplifier is equipped with a three-pronged AC power cord. To reduce the risk of electrical shock,
NEVERremove or otherwise attempt to defeat the ground pin of the power cord.
•Connect the amplifier ONLYto a properly grounded AC outlet of the proper voltage for your amp. 
•Avoid sudden temperature extremes, rain and moisture. Also, avoid sudden and intense impact. (If the unit
has been subjected to any of the preceding abuses, have it looked at by an authorized service center.) 
•Never set the amplifier on a support that might give out under its weight. 
•When using tall or stacked speaker cabinets, use them ONLYon a level surface. NEVER set tall or stacked
cabinets on a surface with more than a five degree incline since tipping or falling could occur, possibly caus-
ing serious injuries. 
•Always keep the total speaker impedance at or above the rated load.
•Unplug the amplifier before cleaning it. NEVER spray liquid cleaners onto the amp. Wipe it with a slightly
dampened, lint-free cloth to remove dirt and film.
•Don’t use the amplifier if it has sustained damage to the chassis, controls, or power cord. Refer the unit to
an authorized service center for inspection.
•Amplifiers capable of producing high volume levels are also capable of inflicting permanent hearing loss or
damage, if the exposure to such levels is prolonged. Such damage is progressive and irreversible! 
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.
THIS EQUIPMENT HAS BEEN DESIGNED AND ENGINEERED TO PROVIDE SAFE AND RELIABLE OPERATION. IN ORDER TO PROLONG THE LIFE OF THE UNITAND PREVENT ACCIDEN-
TAL DAMAGES OR INJURY, PLEASE FOLLOW THESE PRECAUTIONARY GUIDELINES:
WARNING: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 PROP-
ERLY GROUNDED AC POWER OUTLET.
CAUTION: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:OUR AMPLIFIERS ARE CAPABLE OF PRODUCING HIGH SOUND PRESSURE LEVELS. CONTINUED EXPOSURE TO HIGH SOUND PRESSURE LEVELS CAN CAUSE PERMANENT
HEARING IMPAIRMENT OR LOSS. USER CAUTION IS ADVISED AND EAR PROTECTION IS RECOMMENDED IF UNIT IS OPERATED AT HIGH VOLUME. The chart below shows the U.S.
Government Occupational Safety and Health Administration (OSHA) regulations which were in effect at the time of this publication for permissible noise exposure, per 29CRF1910, Table G-16.
According to OSHA, any exposure in excess of those listed above could result in some hearing loss.
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=
=
SOUND LEVEL dBA DURATION PER DAY
SLOW RESPONSE IN HOURS
90 8
92 6
95 4
97 3
100 2SOUND LEVEL dBA DURATION PER DAY
SLOW RESPONSE IN HOURS
102 1-1/2
105 1
11 0 1 / 2
115 1/4 or less
TABLEOFCONTENTS
Important Safeguards and Precautions  . . . . . . . . . . . . . . .2
Introduction  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Features  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
System Block Diagram  . . . . . . . . . . . . . . . . . . . . . . . . . . .3
The Front Panel Controls and Their Use  . . . . . . . . . . . . . .4 
The Rear Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Some Suggested Settings  . . . . . . . . . . . . . . . . . . . . . . . . .6
Changing the Tubes  . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Setting Tube Bias  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Troubleshooting  . . . . . . . . . . . . . . . . . . . . . . . . .back cover
Technical Specifications  . . . . . . . . . . . . . . . . . . .back cover
SVT-2 PRO Bass Amplifier 
						

							3
An Introduction to your new Ampeg SVT-2 PRO Bass Amplifier
The harmonically rich sound and legendary performance of the AMPEG SVT are redefined in the SVT-2 PRO.
This dynamically powerful bass amplifier delivers a thundering 300 watts of unsurpassed quality, reliability and
tonal flexibility, offering the classic vibrancy of tubes as well as contemporary features.
All of the features and controls of your SVT-2 PRO are covered in detail within the pages of this owner’s
guide. We recommend going over them before you use the amplifier.
Features
In the world of high performance bass amps, Ampeg’s SVT amplifiers stand alone. Keeping with true Ampeg tra-
dition, the SVT-2 PRO Bass Amplifier offers you more performance and flexibility than any other amplifier 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.
•ATTENUATOR:A switchable input pad, this feature is perfect for basses with active electronics or
very “hot” pickups (page 4).
•MUTE SWITCH:Lets you cut the sound from the amp, letting you tune your bass in private (page 4).
• ULTRA LOW, ULTRA HIGH AND BRIGHT SWITCHES:Lets you tailor your sound 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).
•9-BAND GRAPHIC EQ:Use as a “second channel” for bass solos, or to shape your sound to your own
exacting standards. An independent level control lets you adjust the Graphic EQ volume. Switchable at
front panel or with a footswitch (page 4).
•BIAS ADJUSTMENT CONTROLS:Let you adjust the tube bias for proper operation (pages 5,7).
•SLAVE OUT:Use for powering another amp from the SVT-2 PRO’s preamp (page 5). 
System Block Diagram
SVT-2 PRO Bass Amplifier
GAIN
LEVEL
INPUT
-15dB PAD
BUFFER
TUNER
OUT
FREQUENCY
PEAK
LED
DRIVEMIDBRIGHT
EQ ON
ULTRA
LOWBASSTREBLEULTRA
HIGH
IMPEDANCE
4 OHMS
2 OHMS
MUTEPRE/POST
LEVEL
MASTER
BIAS
ADJUSTBALANCED 
OUT
GRAPHIC
EQEFFECTS
SENDEFFECTS
RETURN
BUFFER
PREAMP
OUT
POWER AMP
PROTECTION
SLAVE
OUT
1/4 JACK
1/4 JACK SPEAKON
®JACK
SPEAKER
OUTPUTS PWR AMP
INPUT
PWR AMP
POWER
STDBY
FAULT
BIAS
INDICATORS
1+
2+ 1- 2-
GRAPHIC
EQ MUTE
FOOTSWITCH
SWITCHING
CIRCUIT 
						

							4
SVT-2 PRO Bass Amplifier
The Front Panel Controls and Their Use
1. INPUT:This jack accepts a passive or active
instrument or a line level signal through a shield-
ed instrument cable.
2. PAD:This switch attenuates the input signal
by 15dB. Attenuation allows the Gain control (4)
to be used in a more usable (higher) position. If
clipping is indicated even with the Gain control all
the way down, attenuation is needed.
3. MUTE:This switch kills the input to everything
except the Tuner Out (34) to allow silent tuning.
4. GAIN:This control, along with the Attenuator
switch (2), adjusts the basic level of signal in the
preamp. To get the best signal to noise ratio, set
this control so that, on the loudest passages, the
Peak LED (5) flashes occasionally.
5. PEAK/MUTE LED:This LED flashes when
the signal level in the preamp (excluding the
Graphic EQ) approaches clipping. When the
Mute switch (3) is engaged, this LED stays on as
a visual indicator that Mute is active.
6. ULTRA LOW:This switch, when engaged,
provides emphasis to the low frequencies by
boosting the low frequencies and selectively cut-
ting the mid frequencies.
7. BRIGHT:This switch, when pushed IN,
boosts upper mid and high frequencies.
8. DRIVE:This control is used to overdrive the
preamp in order to get various distortion sounds.
In the fully counterclockwise position the preamp
is in the cleanest, traditional SVT condition. As
the control is rotated clockwise, signal level is
increased to drive the preamp harder (into distor-
tion). The tone of the signal is also changed to
provide a smoother overdrive. The tone controls
may have to be readjusted to obtain the overall
desired tone. The Gain control (4) and Attenuator
switch (2) interact with the Drive control. For
greater overdrive, the Attenuator switch shouldbe out and the Drive control fully clockwise. Use
the Gain control to set the amount of overdrive
desired. The Peak LED (5) will glow a steady red
when the amp is used in this manner.
9. BASS:This is the primary low frequency con-
trol. It allows for 12dB of cut or boost at 40Hz.
10. MIDRANGE:This is the primary midrange
control. It allows for 15dB of cut or 12dB boost at
the center frequency selected by the Frequency
control (11).
11. FREQUENCY:Allows you to select the cen-
ter frequency for the Midrange control (10), giving
you a choice of five “voices” for the Midrange.
The center frequencies are (from left to right)
220Hz, 450Hz, 800Hz, 1.6kHz and 3kHz.
12. TREBLE:This is the primary high frequency
control. It allows for 12dB of cut or boost at 4kHz.
13. MASTER:This controls the signal to the
power amp and therefore the overall listening
level. It also controls the level to the Preamp Out
jack (27).
14. ULTRA HIGH:This switch boosts higher fre-
quencies than those affected by the Bright switch
(7).
15. GRAPHIC EQ:This switch places the
Graphic EQ circuitry in or out of the signal path.
The switch must be pushed IN for the Graphic
EQ footswitch to function. In the OUT position,
there is no solid state circuitry in the signal path
from input to power amp out.
16. STANDBY/POWER/FAULT INDICATOR
LED:This is a multi functional LED. In Standby
mode, it glows red. In the On mode (when the
high voltage comes on) it glows green. If it does
not turn green in the On mode, there is no high
voltage present and the unit needs servicing. If
the amp detects a fault in the power tube circuit,
the high voltage is turned off and the LED flash-es between red and green. This usually indicates
a bad power tube. The amp will remain in this
condition until the unit is turned off.
17. STANDBY:The Standby mode allows the
tubes to warm or remain warm without high volt-
age being applied to them. This extends tube life.
During short periods of non-use, the amp should
be put into Standby mode. When the amp is first
turned on, it is automatically in Standby mode,
regardless of the switch position. After approxi-
mately 20 seconds, the amp is in the mode
selected by the switch.
18. POWER:This supplies AC power to the unit.
This switch must be turned off to reset the amp
after a Fault condition.
GRAPHIC EQ SECTION
The Graphic EQ can be used in two ways: 1) To fine
tune your sound, make small adjustments at the
desired frequencies and leave the EQ on throughout
the entire session. (This is great for adapting to varying
room acoustics when going from club to club, etc.) 2)
For a completely different sound, make larger adjust-
ments and only activate the EQ when you want a “sec-
ond channel” sound (such as during bass solos). 
19. FREQUENCY SLIDERS:These control the
nine frequencies of the Graphic EQ section at
the points indicated over each slider.
20. LEVEL:This adjusts the level of the signal
to compensate for boosts or cuts, or for a
desired level change when using the Graphic
EQ.
21. ACTIVE LED:This LED glows green when
the EQ section is enabled by the proper combi-
nation of Graphic EQ switch (15) and footswitch
(35). It flashes red when the signal gets close to
clipping.
-15dB PAD
MUTEPEAK /
  MUTEULTRA LO
BRIGHTULTRA HI
GRAPHIC EQ
MASTER TREBLE FREQUENCY MIDRANGE BASS DRIVE GAIN INPUTPOWER STANDBY
-12dB
0
+12dB
-10dB 0 +8dB
40Hz 90Hz 180Hz 300Hz 500Hz 1kHz 2kHz 4kHz 10kHz LEVEL
ACTIVE / PEAK 
148910111213171816523671415
192021 
						

							5
SVT-2 PRO Bass Amplifier
The Rear Panel
22. AC LINE IN:Firmly plug the supplied AC
power cord into this socket, pushing it in until it is
fully seated. Plug the male end of the cord into a
grounded AC  outlet. DO NOT DEFEAT THE
GROUND PRONG OF THE AC PLUG!
23. FUSE: The fuse protects the amplifier from
damage due to line current faults and other con-
ditions. If the fuse blows, replace it only with the
same size and type as listed on the amplifier.
24. POLARITY:Place this switch in the position
that provides the least electrical buzz from the
unit.
25. BIAS SECTION:These controls and LEDs
allow the user to properly bias the power amp.
26. SLAVE OUT:This jack receives the same
signal that is being sent to the power amp. It is
useful for powering another amp (slave) from
this unit’s preamp.
27. PREAMP OUT:This jack carries the post-
Master (13) signal. It does not break the path to
the power amp. This signal can be used to feed
an external power amplifier, mixing console, or
house PA system.
28. POWER AMP IN:This jack accepts a signal
to be sent to the power amp and the Slave Out
jack (26). It does break the path from the
Preamp Out jack (27). This can be used as a
post-Master (13) patch point.
29. LEVEL:This control adjusts the level of the
signal at the Balanced Out jack (31).
30. PRE/POST:This switch selects a direct out
from the bass (Pre) in the OUT position and thepreamp signal just before the Master (Post) in
the IN position to be sent to the Balanced Out
jack (31).
31. BALANCED OUT:This XLR-type jack is the
output as selected by the Pre/Post switch and
adjusted by the Level control (29). This signal
can be used to feed an external power amplifier,
mixing console, or house PA system.
32. EFFECTS LOOP SEND:This is a post-EQ,
pre-Master (13) patch point send jack. It does
not break the path through the preamp. When
using an external signal processor, connect the
INPUT of the effect to this jack using a shielded
instrument cable to send the signal to the effect
for processing.
33. EFFECTS LOOP RETURN:This is a pre-
Master (13) patch point return jack. It breaks the
path through the preamp. When using an exter-
nal signal processor, connect the OUTPUT of
the effect to this jack using a shielded instrument
cable to feed the processed signal into the
power amp section.
34. TUNER OUT:This is a direct output from the
instrument which can be routed to a tuner. It is
the only output that stays active when the Mute
switch (3) is engaged.
35. FOOTSWITCH:This is a stereo jack which
will operate with a standard dual footswitch. The
tip of the plug controls the Mute operation, the
ring controls the Graphic EQ operation, while the
sleeve acts as a ground common to both. With
the footswitch inserted, both the front panel and
the footswitch Mute switches are active. Thefront panel Graphic EQ switch (15) must be IN
for the Graphic EQ footswitch to operate.
36. IMPEDANCE SELECTOR:Use this switch
to match the output impedance of the amp to the
speaker(s) being used (2 or 4 ohms). For help in
deciding the impedance of your system, consult
the chart below.
37. SPEAKERS:These jacks are provided for
connecting speakers to the unit. While the 1/4”
jacks are convenient, the Speakon
®connector is
preferred for carrying the heavy current from this
amplifier. 
NOTE: In some areas the 1/4” speaker jacks
are not acceptable for use on amplifiers
capable of high output power levels. For this
reason your amplifier may have been
shipped with the 1/4” jacks sealed – use only
the Speakon
®jack for connecting your
speakers. 
38. This is a 1/4-20 weld-nut which can be used
to provide additional support for the rear of the
unit.
Cabinet # of Total
Impedance Cabs Impedance
4Ω22Ω
8Ω24Ω
8Ω42Ω
CAUTION: TO REDUCE THE RISK OF FIRE, REPLACE
FUSE WITH SAME TYPE AND RATING.ATTENTION: UTILISER UN FUSIBLE DE RECHANGE
DE MEME TYPE.
AC LINE IN
POLARITYTO ADJUST BIAS:  ALLOW UNIT TO WARM UP
FOR 20 MINUTES.   ADJUST BIAS CONTROLS
SO  THAT  ONLY  GREEN  LEDS  ARE  LIT.   SEE
MANUAL IF THIS CONDITION CAN NOT BE MET.BIAS 1
CONTROL–
+
SLAVE
OUT
BALANCED OUT BALANCED LINE OUT EFFECTS
LOOP
LEVELPREPREAMP OUT
POWER AMP IN
MODEL
SERIAL #SVT2PRO
MADE IN THE U.S.A. BY   -   SLM ELECTRONICS
1400 FERGUSON AVENUE - ST. LOUIS, MO 63133
100/115VAC - 10A SLO BLO, 125V
       230VAC - 5A SLO BLO, 250V
BIAS 2
CONTROLTUNER OUT
FOOTSWITCHSEND
RETURNPOST
            
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IMPEDANCE
SELECTORSPEAKERS
300 WATTS @
SELECTED
IMPEDANCE
WARNING:HIGH DECIBEL
OUTPUT –
SEE OWNERS
MANUAL
4 OHM
2 OHM
CAUTIONRISK OF ELECTRIC 
SHOCKAVIS:
TO REDUCE THE RISK OF FIRE 
OR ELECTRIC SHOCK, DO NOT 
EXPOSE THIS EQUIP-MENT TO 
RAIN OR MOISTURE.
   RISQUE DE CHOC 
ELEC-TRIQUE – 
NE PAS 
OUVRIR
22 2524 38 26 28 29 30 3127 3332 3536 37
34 23 
						

							6
Some Suggested Settings*
SVT-2 PRO Bass Amplifier
PEAK /
  MUTEULTRA LO
BRIGHTULTRA HIMASTER TREBLE FREQUENCY MIDRANGE BASS DRIVE GAIN
IN
OUT OUTOUT
AS NEEDEDAS NEEDED
PEAK /
  MUTEULTRA LO
BRIGHTULTRA HIMASTER TREBLE FREQUENCY MIDRANGE BASS DRIVE GAIN
IN
OUT OUT
AS NEEDEDAS NEEDED
PEAK /
  MUTEULTRA LO
BRIGHTULTRA HIMASTER TREBLE FREQUENCY MIDRANGE BASS DRIVE GAIN
OUT
OUT OUT
AS NEEDEDAS NEEDED
PEAK /
  MUTEULTRA LO
BRIGHTULTRA HIMASTER TREBLE FREQUENCY MIDRANGE BASS DRIVE GAIN
IN
OUT OUTOUT
AS NEEDEDAS NEEDED
IN
IN
GRAPHIC EQ
GRAPHIC EQ
GRAPHIC EQ
GRAPHIC EQ
*A Note About The Graphic EQ:
The Graphic EQ can be used in two ways:
1)To fine tune your sound, make small adjustments at the
desired frequencies and leave the EQ on throughout the
entire session. (This is great for adapting to varying room
acoustics when going from club to club, etc.); 
2)For a completely different sound, make larger adjustments
and only activate the EQ when you want a “second channel”
sound (such as during bass solos).
ROCK:
JAZZ:
COUNTRY:
FUNK “POPPING”: 
						

							7
SVT-2 PRO Bass Amplifier
Changing the Tubes
Tubes wear out in direct proportion to how often and how hard you play the amplifier. Power tubes should be checked
at least once a year – more frequently if you use the amplifier nearly every day. When the power tubes wear out, the ampli-
fier will begin to grow weak, lack punch, fade up and down, or lose highs and lows. Power tubes work together in a
push/pull configuration and should all be replaced at the same time with matched or balanced tubes. Your dealer can rec-
ommend the best replacement tubes for your amplifier.
Preamp tubes aren’t worked as hard as power tubes and typically last longer. When a preamp tube wears out, the
amplifier may squeal, get noisy, lose gain and sensitivity, or just quit working. A service center can determine which tube(s)
may need replacing.
To get to the tubes in the SVT-II PRO, the rear screen must be removed and the tube retainer(s) must be moved out
of the way. Qualified service personsmay follow these steps to change the tubes:
• Turn the amp off, unplug it and let it cool for at least 5 minutes.
• Remove the screws which hold the four large plastic feet to the rear of the chassis. Set the feet and their screws aside.
• Taking care not to stretch or disconnect any wiring, gently set the perforated metal screen aside.
• Remove the tube retainer(s) by lifting them off the tube and moving them to one side.
• Grasp the tube at its top and gently work it out of its socket by rocking it slightly back and forth as you lift up on it.
• When inserting new output tubes, align the tab in the tube’s plastic base with the slot in the socket and press the tube
gently but firmly into place by pushing down on its top. Preamp tubes have a “missing pin” which corresponds with
the “missing hole” in the socket – line up the missing pin and hole before pressing the tube into its socket.
• Replace the tube retainer(s) on the tube(s).
• Replace the perforated screen, the four large plastic feet, and tighten their screws.
• Power up the amplifier and let it sit for at least 20 minutes. Bias the amplifier as directed in the section below.
Setting Tube Bias
Allow the unit to warm up at proper AC line voltage for at least 20 minutes. With no input signal present, adjust each
control so that only the associated green LED is lit. The controls may be slightly interactive. If neither LED is lit, the amp
is overbiased. This will result in some distortion in the power amp and a generally thin sound. If the green and red LED are
lit, the amp is underbiased and too much current is flowing in the power tubes. This will give a big, full sound but will also
reduce the life of the power tubes. Once set, the controls should not have to be changed except as needed for tube
replacement, or to compensate for tube aging. Note that the AC line voltage may vary from place to place and the LEDs
will read slightly different. There is no need to fiddle with this every other day. Note that it is normal for the red LEDs to light
when there is a signal present. Bias 1 Control adjusts the three left (as seen from the rear) power tubes. Bias 2 Control
adjusts the three right power tubes. By observing the LEds as the Bias Controls are slowly rotated clockwise, a number of
tube problems can be diagnosed by the user:
Condition
ProblemSolution
Green comes on, then red No problem (The longer the green LED is on before the red
LED comes on, the better matched the tubes are.)
Red comes on, then green Tubes not properly matched Set slightly before green comes on, obtain 
matched tubes when possible.
Red comes on, no green One or more tubes are non-functioning Check to make sure tubes are all seated properly;
if so, find and replace bad tube(s).
None on Possibly no high voltage or bad Have unit checked by a service technician.
Bias Control or bad tube(s)
Both on all the time Possible bad Bias Control or bad tubes Have unit checked by a service technician.
If the tubes are bad enough to cause damage to the unit, the Fault Indicator (#16, front panel) will signal and the unit will
shut down. 
						

							Ampeg reserves the right to change specifications without notice.
Ampeg is proudly Made in America
©1998 SLM Electronics • 1400 Ferguson Avenue • St. Louis, MO 63133 U.S.A.
P/N 47-509-11 • 04/98
Technical Specifications
OUTPUT POWER RATING300 Watts RMS minimum continuous @