TUBE POWERAMP
930/60
930/
Operator´s Manual
Please, first read this manual carefully!
1
20
In addition to a first class tube tone, the poweramp offers a number
of practical features in a powerful 2x60 watt (Model 930/120=>2x120 W)
package. A switchable input system (INPUT A/B) enables you to switch back
and forth between two preamps; each of the two stereo channels features
two volume and two presence controls (A and B), so you can dial in diverse
volume and presence settings for each preamp. The A/B controls, in
combination with one preamp, also enables you to activate different volume
and presence settings for an incredible range of switching options. The
DEPTH BOOST button delivers loads of low end. Similar to the A/B functions,
it is also switchable via an external footswitch or MIDI commands via the
MIDI Interface. The GAIN button provides optimum input signal levels
for both poweramp sides and the MONO/STEREO function enables you to
activate the mono mode where both poweramp channels receive identical
signals. You can assign the INPUT A/B button´s function to the A/B
VOLUME switching via a button located on the rear panel.
Comprehensive connection options offer you maximum flexibility: the Stereo
Master FX Loop enables you to patch in FX devices in combination with two
preamps. The 930 is equipped with 4, 8 and 16 ohm speaker outputs for
virtually any kind of cabinet rig you care to devise. Separate Standby
switches provide a single p.a. side operation option.
The integrated E.C.S. (Emergency Circuit System) protects the amp from
damage due to power tube defects/failure and ensures the amp does not
shut down. It continues to function on both channels; the affected channel
operates at a reduced power output level.
This amp is defined by the effort and materials that went into it:
intelligent design features, superior craftsmanship, impeccable finishing and
quality components. However keep in mind, that a few precautions will
radically extend tube life (see handling and care guidness). The entire
-Team would like to thank you for your faith in our product; we hope
you derive a great deal of joy and satisfaction from your -TUBE
POWERAMP 930.
PLEASE NOTE: Read the Operator's Manual carefully and thoroughly,
especially the Handling and Care section as well as the guidelines in
bold-face type. Avoid operating errors and potential damage to the amp by
heeding the guidelines and cautionary remarks in this manual. The footnotes
also cover a few convenient pointers and interesting tips on several
functions. These are listed on side 3 of the manual.
The VOLUME A/B switching feature can be used for the following applications:
TIP1
1) In combination with one preamp, to activate two different volumes, for instance
one for rhythm work, the other for soloing.
2) In combination with two preamps, to define a separate volume level for each
preamp. In this case, set the button 32 to the VOLUME A/B mode, then VOLUME A
is assigned to INPUT A and VOLUME B is assigned to INPUT B automatically.
3) In combination with two preamps, to define separate volume levels than can be
assigned to either preamp. Set button 32 to the INPUT A/B mode so you can assign
the volume levels freely to the two inputs. In this case select inputs via the
INPUT A/B button(11).
The PRESENCE A/B switching feature can be used for the following applications:
TIP2
1) In combination with a two-channel preamp (Clean/Lead) a possible option could be
a setting of 1 to 4 o´clock for the two PRESENCE A controls and a setting of 8 to 12 o´clock
for the two PRESENCE B controls. Use PRESENCE A when the preamp is in the clean mode,
and PRESENCE B for lead tones.
2) In combination with two preamps, to define a separate PRESENCE setting for each
preamp, or
3) to assign the PRESENCE controls freely to the two preamps.
If you encounter a ground loop in your 19" rack (usually caused by a double connection
TIP3
between grounded devices and the audio signal ground), you can sever the ground from
the housing by setting the GROUND LIFT switch to the GROUND FLOATED position.
The ENGL MIDI INTERFACE offers even more comfortable handling features and loads of
TIP4
interesting combinations. This interface allows you to switch the four defined functions via
a MIDI stage board. You can also save diverse sound combinations as presets in up to
99 MIDI memory locations, assign polychannels 1-8 via the interface and control another
ENGL device, equiped with the MIDI Interface Port.
The switching functions VOLUME A/B (3), PRESENCE A/B (8), INPUT A/B (11) and DEPTH BOOST
TIP5
(12) can also be executed via a looper/switcher or other MIDI devices that feature four
freely-programmable (switching-)inputs. Depending on the type of MIDI device, you may have
to split the FOOTSWITCH stereo jacks into four mono jacks. Each switching function requires
the mono or stereo contact see 26 and 27 for assignments and the ground!
NOTE! If the switching and signal grounds are identical in the MIDI device, then you may
encounter a ground loop, especially if the amp and device (e.g. FX processor) exchange signals!
The MASTER FX LOOP offers you the opportunity to run two preamps through an FX processor
TIP6
without requiring a separate complex looping system!
Choose only one of the following cabinet options for each channel:
A. One 4 ohm cabinet connected to a 4 ohm jack,
TIP7
B. Two 8 ohm cabinets connected to the 4 ohm jacks,
C. One 8 ohm cabinet connected to a 8 ohm jack,
D. Two 16 ohm cabinets connected to the 8 ohm jacks,
E. One 16 ohm cabinet to the 16 ohm jack.
If you are using one stereo speaker cabinet for both channels, ensure it actually operates
in the stereo mode, otherwise you may damage the power amp!
Front Panel
TUBE POWERAMP 930/60
14 15 16 17
160 mAM 160 mAM 160 mAM 160 mAM
P
A / BLEFT BLEFT A RIGHT A RIGHT B LEFT A LEFT B A / B RIGHT A RIGHT B
V
OLUME
P
RESENCE
OWER TUBE FUSES
MIDI
MODE
INPUT
DEPTH
A / B
LEFT RIGHT
BOOST
S
TANDBY
P
OWER
1 2 34 567 8 9 10 12
VOLUME LEFT A
1
volume control A for the left power amp.
VOLUME LEFT B
2
volume control B for the left power amp.
VOLUME A / B
3
switches between VOLUME A and VOLUME B,
the activ VOLUME controls are identified by
TIP1
LED´s next to the respective controls:
VOLUME A: red LED´s
VOLUME B: green LED´s
This feature can also be switched via the MIDI
Interface Port (25) or a footswitch connected
to jack 27; the VOLUME A/B pushbutton is
deactivated once a footswitch is connected.
VOLUME RIGHT A
4
volume control A for the right power amp.
VOLUME RIGHT B
5
volume control B for the right power amp.
PRESENCE LEFT A
6
treble control A in the power amp, left channel.
PRESENCE LEFT B
7
treble control B in the power amp, left channel.
PRESENCE A / B
8
switches between PRESENCE A and PRESENCE B,
the activ PRESENCE controls are identified by
TIP2
LED´s next to the respective controls:
PRESENCE A: red LED´s
PRESENCE B: green LED´s
This feature can also be switched via the MIDI
Interface Port (25) or a footswitch connected
to jack 27; the PRESENCE A/B pushbutton is
deactivated once a footswitch is connected.
PRESENCE RIGHT A
9
treble control A in the power amp, right channel.
PRESENCE RIGHT B
10
treble control B in the power amp, right channel.
INPUT A / B
11
switches between INPUT A and INPUT B,
red LED inicates INPUT B is activ.
TIP1
11 13
18 19 20
This feature can also be switched 1) via the MIDI
Interface Port (25) or 2) a footswitch connected
to jack 26. 3) It also can be assigned to
the VOLUME A/B function (see button 32).
The INPUT A/B pushbutton is deactivated in
case 2) and 3).
DEPTH BOOST (Lo/Hi)
12
Boosts the bottom end in both channels of the
poweramp; red LED indicates activ function.
This feature can also be switched via the MIDI
Interface Port (25) or a footswitch connected
to jack 26; the DEPTH BOOST A/B pushbutton is
deactivated once a footswitch is connected.
MIDI MODE
13
This red LED illuminates when the ENGL
Interface is connected and activated; the LED
flashes when the poweramp is operating in
the MIDI mode.
POWER TUBE FUSE
14
Power tube fuse (E.C.S. - read description!) for
the power tube V4 assigned to the left channel.
The red LED indicates a defective fuse.
POWER TUBE FUSE
15
Power tube fuse (E.C.S. - read description!) for
the power tube V5 assigned to the left channel.
The red LED indicates a defective fuse.
POWER TUBE FUSE
16
Power tube fuse (E.C.S. - read description!) for
the power tube V6 assigned to the right channel.
The red LED indicates a defective fuse.
POWER TUBE FUSE
17
Power tube fuse (E.C.S. - read description!) for
the power tube V7 assigned to the right channel.
The red LED indicates a defective fuse.
STANDBY LEFT
18
left channel standby
STANDBY RIGHT
19
right channel standby
POWER
20
AC power on/off
25 26 27 28 29 30
DEPTH
VOLUME
BOOST
MIDI INTERFACE PORT
C
AUTION !
C
ONNECT TO
M
IDI INTERFACE
O
NLY !
CAUTION !
DO NOT OPEN !
RISK OF ELECTRIC SHOCK !
DO NOT EXPOSE THIS EQUIPMENT
TO RAIN OR MOISTURE !
22
21
!
GROUND LIFT
SWITCH
GROUND
FLOATED
GROUND
23 24
A / B
INPUT
PRESENCE
A / B
A / B
F
OOTSWITCH
All-tube Stereo Poweramp
MADE IN GERMANY
Optically refined by: CLARK / Meinerz
930/60
FUSED
V
OLTAGE
100-120 V
5 AM
220-240 V
2,5 AM
R
EPLACE FUSE ONLY WITH
SAME TYPE AND RATING !
SERIAL NUMBER:
WIRED FOR:
930/120
6,3 AM
3,15 AM
Rear Panel
FUSED
31
32 33 34
A INPUT RIGHT B A INPUT LEFT B
SENDR L R RETURN L
8 OHM 16 OHM
4 OHM
PARALLEL RIGHT
GAIN INPUT
HIGH
LOW
RIGHT
S
OUTPUT
PEAKER
INPUT
A / B
ASSIGNED
TO:
I
NPUT
MONO
A / B
V
OLUME
STEREO
A / B
MASTER
F.X. LOOP
16 OHM
8 OHM
LEFT
4 OHM
PARALLEL LEFT
41424344454648,47
35,36
37,38
39,40
AC Socket
21
connect AC cord here.
ATTENTION: Ensure you use an intact AC
cord with an insulated plug only!
Before you power the amp up, ensure the
voltage value printed beside the AC socket
corresponds to the available current!
AC Fuse Box
22
contains mains fuse (rear chamber) and
spare fuse (front chamber).
NOTE: Ensure replacement fuses bear
identical ratings (refer to the table)!
GROUND LIFT SWITCH
23
GROUND-position: direct connection between
amp´s ground and outlet ground.
TIP3
GROUND FLOATED-position: no direct
connection between amp´s ground and
outlet ground => use this feature, to avoid
ground loops in combination with other
grounded 19" units.
Fan Shaft
24
ultra-quiet fan ensures your poweramp
remains cool; fresh air is sucked in via
this shaft.
ATTENTION: Install the amp in a 19" rack
in such a manner as to ensure air
circulation is not impeded.
Do not block or cover the fan shaft,
the side and the front coolant vents.
25
MIDI INTERFACE PORT
You can connect the ENGL MIDI INTERFACE
to this jack (Sub D, 25 pins) and then execute
TIP4
VOLUME A/B (3), PRESENCE A/B (8),
INPUT A/B (11) and DEPTH BOOST (12)
switching via MIDI. You can also save the
switch settings. The MIDI MODE LED (13)
illuminates when the interface is active.
Flashing LEDs denote the amp is operating
in the MIDI mode.
FOOTSWITCH: DEPTH BOOST,
26
INPUT A/B
1/4" stereo jack for connecting a two-way
TIP5
footswitch for the following functions:
1. DEPTH BOOST-switching Lo/Hi
(Mono contact).
2. Switching between INPUT A and
INPUT B (Stereo contact).
FOOTSWITCH: VOLUME A/B,
27
PRESENCE A/B
1/4" stereo jack for connecting a two-way
footswitch for the following functions:
1. Switching between VOLUME A and
VOLUME B (Mono contact).
2. Switching between PRESENCE A and
PRESENCE B (Stereo contact).
INPUT RIGHT A
28
Signal input A to right power amp channel.
INPUT RIGHT B
29
Signal input B to right power amp channel.
GAIN Hi/Lo
30
power amps’ input sensitivity
INPUT MONO/STEREO
31
In the MONO position, the left and right inputs
are bridged and the two poweramp sides
receive the same signal.
INPUT A/B ASSIGNED TO
32
Use this button to assign the
INPUT A/B switching function to:
TIP1
1.INPUT A/B position (button depressed):
Input A or B is activated via the
INPUT A/B (11) button.
2.VOLUME A/B position(button not depressed):
Input A or B is activated via the
VOLUME A/B (3) button; in this case
the INPUT A/B button (11) is deactivated.
VOLUME A: Input A activ,
VOLUME B: Input B activ.
INPUT LEFT A
33
Signal input A to left power amp channel.
INPUT LEFT B
34
Signal input B to left power amp channel.
MASTER FX LOOP: SEND RIGHT
35
Signal output right channel for the
Master stereo FX loop.
TIP6
Connect this output to the signal processor's
right input/return jack via a shielded cable
with 1/4" plugs.
MASTER FX LOOP: SEND LEFT
36
Signal output left channel for the
Master stereo FX loop.
TIP6
Connect this output to the signal processor's
left input/return jack via a shielded cable
with 1/4" plugs.
MASTER FX LOOP: RETURN RIGHT
37
Signal input right channel for the
Master stereo FX loop.
TIP6
Connect this intput to the signal processor's
right output/send jack via a shielded cable
with 1/4" plugs.
MASTER FX LOOP: RETURN LEFT
38
Signal input left channel for the
Master stereo FX loop.
TIP6
Connect this intput to the signal processor's
left output/send jack via a shielded cable
with 1/4" plugs.
SPEAKER OUTPUT:
39,
8 OHM PARALLEL LEFT
40
8Z left channel speaker output jacks;
internal parallel signal path for the
TIP7
connection of one 8Z or two 16Z cabinets.
SPEAKER OUTPUT: 4 OHM
41,
PARALLEL LEFT
42
4Z left channel speaker output jacks;
internal parallel signal path for the
TIP7
connection of one 4Z or two 8Z cabinets.
SPEAKER OUTPUT: 16 OHM LEFT
43
16Z left channel speaker output jack for
the connection of one 16Z cabinet.
TIP7
SPEAKER OUTPUT: 16 OHM RIGHT
44
16Z right channel speaker output jack for
the connection of one 16Z cabinet.
TIP7
SPEAKER OUTPUT: 4 OHM
45,
PARALLEL RIGHT
46
4Z right channel speaker output jacks;
internal parallel signal path for the
TIP7
connection of one 4Z or two 8Z cabinets.
SPEAKER OUTPUT: 8 OHM
47,
PARALLEL RIGHT
48
8Z right channel speaker output jacks;
internal parallel signal path for the
TIP7
connection of one 8Z or two 16Z cabinets.
IMPORTANT: If you choose to use just one
power amp channel, ensure you switch the
other channel's STANDBY switch off.
Never operate an active stereo channel
without a connected speaker, you may
destroy the power amp!
Ensure your cabinet's specifications match
the respective output's specs!
Tube array
left output
transformer
right output
transformer
fan
V 5 V 7
V 4
V 1 V 2 V 3
V6
BIAS
left
MIDI
fuse
internal
fuse for
the mains
right
power
transformer
Technical Data
Rated power 2x60 Watt (model 930/60)
2x120 Watt (model 930/120)
Outlet each channel
Input level
(0 dB => 1Veff)
Tubes
4, 8 and 16 ohms
GAIN Lo: - 5 dB, max. 15 dB
GAIN Hi: -23 dB, max. -3 dB
V1 => ECC83/12AX7 selected
V2,V3 => ECC83/12AX7 standard
930/60:
V4,V5 => 6L6GC, matched set
V6,V7 => 6L6GC, matched set
Fuses
930/60
AC Mains
external
internal
Power Tube Fuses (E.C.S.): 4x160mAM
Caution: Replace fuses only with others of the same rating!
Dimensions 19', 3 rack spaces, depth: 350mm (not including handles)
Weight
230V
2,5 AM
3,15 AT
100V und 120V
5 AM (medium)
6,3 AT (slow)
930/120:
V4,V5 => 6550A, matched set
V6,V7 => 6550A, matched set
930/120
AC Mains
external
internal
Power Tube Fuses (E.C.S.): 4x315mAM
app.15 kg (930/60), 19 kg (930/120)
230V
3,15 AM
4 AT
100V und 120V
6,3 AM
8 AT
E.C.S. (Emergency Circuit System)
This circuit ensures the poweramp does not shut down completely when a
single power tube failes. You can continue to play, but the affected channel's
output power is reduced by 2/3rds (depending on the type of defect).
Gas developing in the power tubes can cause a momentary short circuit.
The fuse activates, but the poweramp is not shut down!
Often the tube absorbs the developed gas, and is operable after a short circuit.
Usually the problem can be rectified by replacing the fuse, but if the new fuse
activates as well, the defective power tube needs to be replaced.
Handling and Care
Protect the poweramp from mechanical knocks (tubes!)
Let the poweramp cool down before you transport it (app.10 minutes).
Tubes need about 20 seconds to warm up after you switch the power on,
and furtheron a few minutes before they reach their full power capability.
Avoid storing the poweramp in damp or dusty rooms, they are hard on jacks,
switches and potentiometers.
Ensure air can circulate at the rear, the front and both sides of the poweramp
to allow for adequate cooling (increases component life).
Never operate the poweramp without an adequate load!
Replace tubes with select replacement tubes (special selection criteria)
to avoid microfonic properties, undesireable noise and unbalanced
performance.
Attention! Please read the following!
This Amp is in a position, to produce high volume levels. Exposure to
high volume levels may cause hearing damage!
Leave tube replacement and power amp biasing to a qualified
professional. Ensure the unit is switched off and unpluged!
Caution -tubes can get very hot and cause skin burns.
Always use high-quality cables.
Never operate the amp through an ungrounded outlet!
Never bridge a defective fuse and ensure replacement fuses feature
identical ratings!
Pull the AC mains plug before replacing fuses!
Never open the chassis or attempt repairs on your own. Consult
qualified service personnel!
Never expose the amplifier to extreme humidity or dampness!
Please read the instructions carefully before operating the unit!
We reserve the right to make unannounced technical upgrades!
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