Peavey 400 User Manual [en, de, fr]
Cover for Classic® 400
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CAUTION: To reduce the risk of electric shock, do not remove cover. No user serviceable parts inside. Refer servicing to
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E N G L I S H
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Classic® 400 Features
• All-tube preamp and power amp • Resonance and presence controls
• Eight 6550 power tubes • Transformer balanced XLR jack
• Five 12AX7s and one 12AT7 • Push button selectable Pre and Post EQ Send
• Patented DDT™ power amp compression for XLR jack
(defeated with push button) • Ground lift push button for XLR jack
• No solid state devices in signal path • 10 dB pad for active/high output basses
• Two channels with separate EQ • Fan cooled
• Remote channel switching and combining • Standby switch
• Remote switchable effects loop
Congratulations on your purchase of the Peavey Classic® 400 all tube bass amplifier. The Classic 400 has
the sound of the vintage amplifiers but with the features and reliability of modern amplifiers. Features such
as remote channel switching, remote switchable effects loop, and our patented DDT circuitry make for an
awesome professional bass rig. Modern distortion sounds are easily obtained in the Crunch channel, something that most bass rigs don’t have! In fact, the Classic 400 is capable of mixing a screaming distortion
sound (from the Crunch channel) with the smooth tube sound of the Clean channel! So read on and familiarize yourself with all the controls of the Classic 400 so you don’t miss any of the great sounds you can
get—and be prepared to get blown away!
FRONT PANEL FUNCTIONS
INPUT PAD SWITCH (1)
Provided for instruments that have extremely high output, which can result in overdriving (distorting) the
input stage. Depressing the switch to its “in” position reduces the level of the input signal by 10 dB.
INPUT JACK (2)
This input will accept signals from all types of bass pickups.
CHANNEL SELECT SWITCH (3)
Allows selection of the Clean or Crunch channel. The “out” position of the switch selects the Clean channel,
and the “in” position selects the Crunch channel.
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Note: Channel selection may also be accomplished by the remote footswitch. If the remote selection is
desired, the select switch must be in the “out” position.
CHANNEL COMBINE SWITCH (4)
Allows selection of single channel or combined channel operation. The “in” position of the switch selects
combined channel operation where both channels operate simultaneously. The “out” position selects single
channel operation.
CLEAN CHANNEL INDICATOR (5)
Illuminates green when channel is activated.
PRE GAIN — CLEAN CHANNEL (6)
Controls the input volume level of the channel.
LOW CONTROL — CLEAN CHANNEL (7)
Passive tone control that adjusts the low frequencies.
LOW CUT SWITCH — CLEAN CHANNEL (8)
Passive low frequency roll-off filter that is activated when the button is in the “in” position.
LOW BOOST SWITCH — CLEAN CHANNEL (9)
Passive filter that provides increase in the low frequencies when the button is in the “in” position.
MID CONTROL — CLEAN CHANNEL (10)
Passive tone control that adjusts the mid frequencies.
MID SHIFT SWITCH — CLEAN CHANNEL (11)
Shifts and selects the frequencies at which the Mid Control operates.
HIGH CONTROL — CLEAN CHANNEL (12)
Passive tone control that adjusts the high frequencies.
HIGH BOOST SWITCH — CLEAN CHANNEL (13)
Passive high frequency filter that provides increase in the high frequencies when the button is in the “in”
position.
CRUNCH CHANNEL INDICATOR (14)
Illuminates yellow when channel is activated.
PRE GAIN — CRUNCH CHANNEL (15)
Controls the input volume level of the channel.
Note: Distortion sounds may be achieved by setting this control above five. The amount of distortion is
dependent on the strength of the signal coming from the instrument.
LOW CONTROL — CRUNCH CHANNEL (16)
Passive tone control that adjusts the low frequencies.
LOW BOOST SWITCH — CRUNCH CHANNEL (17)
Passive low frequency roll-off that is bypassed providing an increase in the low frequencies when the button
is in the “in” position.
Note: Distortion sounds are smoother when this button is in the “out” position.
MID CONTROL — CRUNCH CHANNEL (18)
Passive tone control that adjusts the mid frequencies.
HIGH CONTROL — CLEAN CHANNEL (19)
Passive tone control that adjusts the high frequencies.
HIGH BOOST SWITCH — CRUNCH CHANNEL (20)
Passive high frequency filter that provides increase in the high frequencies when the button is in the “in”
position.
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POST GAIN SWITCH — CRUNCH CHANNEL (21)
Controls the overall volume level of the Crunch channel. The final level adjustment should be made after the
desired sound has been achieved.
™
INDICATOR (22)
DDT
Illuminates yellow LED when DDT Compression is taking place.
™
DEFEAT SWITCH (23)
DDT
DDT power amp compression is defeated when the button is in the “in” position.
Note: When DDT is defeated there is a greater chance of loudspeaker damage since power amplifier
clipping can occur.
RESONANCE CONTROL (24)
Used to fine tune speaker enclosure low-frequency response by varying the damping factor at low
frequencies.
PRESENCE CONTROL (25)
Used to fine tune speaker enclosure high-frequency response by varying the damping factor at high
frequencies.
STANDBY SWITCH AND GREEN LED (26)
In the standby position the green LED is off indicating the amplifier is not operational. In the on position the
green LED is illuminated indicating the amplifier is operational. In the Standby mode the tubes remain hot
but the amplifier is not operational.
POWER SWITCH AND RED LED (27)
The power switch is used to turn power to the amplifier on and off. The red LED will illuminate indicating
power is being supplied to the DC power supply.
Back Panel:
28 29 30 31 32 33 34 37 38
BACK PANEL FUNCTIONS
MAINS FUSE HOLDER (28)
WARNING: THE FUSE SHOULD ONLY BE REPLACED WHEN THE POWER CORD HAS
BEEN DISCONNECTED FROM ITS POWER SOURCE.
CAUTION: USING A FUSE LARGER THAN THE RECOMMENDED SIZE COULD
RESULT IN PERMANENT DAMAGE TO THE UNIT.
The fuse is located within the cap of the fuseholder. If the fuse should fail, IT MUST BE REPLACED WITH THE SAME TYPE AND VALUE IN ORDER TO AVOID DAMAGE TO THE
EQUIPMENT AND TO PREVENT VOIDING THE WARRANTY. If the unit repeatedly blows
fuses, it should be taken to a qualified service center for repair.
LINE CORD—120 V products only (29)
For your safety, we have incorporated a 3-wire line (mains) cable with proper grounding facilities.
It is not advisable to remove the ground pin under any circumstances. If it is necessary to use
the equipment without proper grounding facilities, suitable grounding adaptors should be used.
Less noise and greatly reduced shock hazard exists when the unit is operated with properly
grounded receptacles.
38373635
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GROUND POLARITY SWITCH (30)
Three-position, rocker-type switch which, in most applications, should be operated in its center (zero)
position. There may be some situations when audible hum and/or noise will come from the loudspeaker. If
this occurs, position the Ground Switch to either positive or negative (+ or -), or until the noise is minimized.
Note: Should the noise problem continue, consult your authorized Peavey dealer, the Peavey factory, or a
qualified service technician. The Ground Switch is not functional on 220/240 volt models.
PARALLELED SPEAKER JACKS (31)
Two 1/4" speaker jacks are provided. These jacks are in parallel. The impedance switch selects the total
impedance plugged into the amplifier.
IMPEDANCE SELECTOR SWITCH (32)
Used to select the impedance of the total load plugged into the speaker jacks of the amplifier.
Note: For speakers in series, the impedance will add. For two speakers of equal impedance in parallel, the
total impedance is half.
REMOTE SWITCH JACK (33)
Provided for connection of the footswitch. Footswitch allows channel selection, channel combine and effects
loop. Front panel Channel Select and Channel Combine switches must be in the "out" position for footswitch
to function properly.
XLR JACK (34)
A transformer balanced 600 ohm XLR jack is provided for direct patching of the amplifier to recording or
sound reinforcement consoles.
GROUND LIFT SWITCH (35)
Provided to lift the XLR jack ground when hum loops are encountered when patching the amplifier to mixing
consoles.
PRE/POST SWITCH (36)
Provided for the selection of either a Pre or Post EQ send to be internally patched to the XLR jack.
PREAMP OUT/POWER AMP IN JACKS (37)
These jacks are provided for in-line patching of effects devices. To patch an effects unit, connect the Preamp
Output to the input of the device. Next, connect the output of the device to the Power Amp Input (highquality, shielded cables must be used for these connections). The Preamp Output can also be used to route
the line level signal to a mixing console, tape recorder, etc. Connect the Preamp Output, using a shielded
cable, to an input of the tape recorder, mixer, etc. This patch does not affect the operation of the amplifier.
Note: The Preamp Output level is approximately 1 volt RMS and is of relatively low impedance (600 ohms).
Any effects device used in this effects loop must be capable of receiving 1 volt input and providing 1 volt
output in order to properly drive the power amp. The Power Amp Input has an internal switch which disconnects the internal preamp.
EFFECTS SEND/RETURN JACKS (38)
Provided for connecting external effects devices into the signal path. To patch an effects device, connect the
send jack to the input of the device. Connect the output of the device to the return jack. High-quality shielded
cables must be used for these connections.
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SPECIFICATIONS
POWER AMPLIFIER SECTION
All-Tube Power Amplifier:
(8) 6550 power tubes
Driver:
(1) 12AT7
Input Stage and Phase Splitter:
(2) 12AX7s
Rated Power:
400 watts RMS into 4 or 8 ohm with 120 V AC 60 Hz line
Power at Clipping: (typically)
420 watts RMS into 4 or 8 ohm load @1 kHz with
120 V AC line
Sensitivity:
1 V RMS/0 dB
Hum and Noise:
greater than 85 dB below rated power
Power Consumption:
Domestic: 1000 watts, 50/60 Hz, 120 V AC
Export: 1000 watts, 60 Hz, 220-230/240 V AC
DDT Power Amplifier Compression:
No solid state devices in signal path
Input Sensitivity:
Clean Channel
Nominal: 90 mV RMS / -20.92 dB
Minimum: 16 mV RMS / -35.92 dB (Pre Gain set at 10)
Maximum: 1.5 V RMS / 3.52 dB
Crunch Channel
Nominal: 80 mV RMS / -21.94 dB
Minimum: 6 mV RMS / -44.44 dB (Pre Gain set at 10)
Maximum: 1.5 V RMS / 3.52 dB
Tone Controls:
Passive type controls used in both the Clean and
Crunch channels
Preamp Out/Power Amp In Jacks:
Preamp Out
Load Impedance: 1 K ohm or greater
Nominal Output Level: 1 V RMS / 0 dB
Power Amp In
Impedance: 22 K ohms
Nominal Input Level: 1 V RMS / 0 dB
(Switching jack provides Preamp out to Power Amp in
connection when not used.)
XLR Jack:
600 ohm transformer balanced
Nominal Pre EQ Send: Output buffered from input jack
Nominal Post EQ Send: 870 mV RMS, -1.2 dB
PREAMP SECTION
(3) 12AX7s
Control settings for the following measurements:
Channel Select: Out (Clean channel)
Channel Combine: Out
-10 dB Pad: Out
Clean Channel Settings:
Pre Gain: 5
Low: 5
Mid: 5
Mid Shift: 600 Hz
High: 5
Low Cut: Out
Low Boost: Out
High Boost: out
Crunch Channel Settings:
Pre Gain: 5
Low: 5
Mid: 5
High: 5
Low Boost: Out
High Boost: Out
Effects Loop:
Send
Load Impedance: 1 K ohm or greater
Nominal Output Level: 316 mV RMS, -10 dB
Return
Impedance: 500 K ohms
Nominal Input Level: 316 mV RMS, -10 dB
(Switching jack provides Effects Send to Effects Return
connection when not used.)
Footswitch Functions:
Channel Select
Channel Combine
Effects Loop selection
(Note: Front panel buttons for Channel Select and Channel
Combine must be in the "out" position for footswitch to
function properly.)
Dimensions & Weight:
11.00" H x 24.75" W x 17.125" D
93.6 lbs.
TM
®
Due to our efforts for constant improvements,
features and specifications listed herein are subject to change without notice.
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Input
-10 dB Pad
Pre Gain
Low Boost
High Boost
Tube Stage
1/2 12AX7
Post Gain
Effects
Loop Send
Effects
Loop
Return
Switch
Logic
Preamp
Out
Power Amp
In
Power Amplifier
(8) 6550s
(2) 12AX7s (1) 12AT7
400 watts RMS
Resonance and Presence
DDT Circuit
Defeat Switch
Impedance
Selector
Switch
Parallel
Speaker Jacks
4 or 8 ohms
Crunch Channel
Clean Channel
Tube Stage
1/2 12AX7
Tube Stage
1/2 12AX7
Tube Stage
1/2 12AX7
Mid Shift
Tube Stage
1/2 12AX7
Pre Gain
Tube Stage
1/2 12AX7
3-Band Passive EQ
LOW - MID - HIGH
3-Band Passive EQ
LOW - MID - HIGH
Low Boost High Boost
Low Cut
Flowchart
the unit's functions, please study this diagram carefully.
This flowchart illustrates signal flow within the unit. In order to thoroughly understand
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