Rear Panel
18
20
22 23 24
16 17
16 AC Socket:
Connect an AC cord here.
CAUTION:
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.
17 AC Fuse Box:
Contains mains fuse (rear chamber) and spare fuse (front chamber).
NOTE: E
nsure replacement fuses bear identical ratings (refer to the table)!
18 V.L.S. Ratio:
Use this potentiometer to determine the balance between the two master volume
levels. We deliberately left the knob off this pot, but you can rotate the shaft to dial in the desired
preset. If you're operating the amp without a footswitch, "Master Hi" (high-volume mode) is active
and this pot is disabled. You can switch between the Lo and Hi Master volume levels via a standard
dual footswitch connected to Jack 21 (or via the MIDI Switcher) or the Custom Footswitch
connected to Jack 19. Turn the pot's shaft clockwise to turn up the "Master Lo" level.
19 Custom Footswitch Port:
Connect the ENGL Custom Footswitch Z-5 (optional) to this port
(Sub-D, 9-pin). This special footswitch lets you activate the four channels directly via dedicated
buttons. V.L.S. (Volume Level Switching) and reverb are activated via two additional buttons.When
the Z-5 footswitch is connected, the Clean/Lead and Gain Lo/Hi buttons on the front panel as well
as footswitch Jacks 20 and 21 are disabled.
20 Footswitch Clean/Lead, Gain Lo/Hi:
1/4" stereo jack for a dual footswitch, executes the
following functions:
1. Channel switching between Clean and Lead (mono terminal).
2. Gain Lo - Hi: switches from Clean to Crunch during Clean mode and
from Soft Lead to Heavy Lead during Lead mode (stereo terminal).
21 Footswitch V.L.S., Reverb:
1/4" stereo jack for a dual footswitch, executes the following
functions:
1. Switching between the two Master volume levels Hi and Lo (mono terminal).
2. Reverb on/off (stereo terminal).
Impotant Note:
You can use standard dual footswitches that connect the mono or stereo contact
of the ¼" jack and its ground. An LED that serves as a status indicator can also be connected in
series (power requirements approx. 10 - 20 milliamperes, depending on function). In practice
though we've found that not every footswitch by every manufacturer under the sun is compatible. If
you choose to use the ENGL Z-3 (basic plastic version without LED display) or ENGL Z-4 (rugged
metal version with LED display) footswitches, you won't encounter any compatibility problems.
10 Lead Volume:
Volume control for the Lead channel (pre-FX loop, influences the Send level). Use
this knob to dial in the desired balance of levels between the Lead and Clean channels.
11 Gain Lo/Hi:
When you press this button, the input sensitivity of both channels is increased.
The Hi-Gain function actually turns Clean into a "Crunch" channel, and Lead into a "Heavy Lead"
channel. It can also be activated via a suitable footswitch connected to Jack 19 or 20; the Gain
Lo/Hi button is automatically disabled when you connect a footswitch.
The yellow LED illuminates to indicate "Hi-Gain" mode is active.
12 Clean/Lead:
Channel selector pushbutton for Clean and Lead modes, red LED indicate Lead
mode; This function can also be activated via the respective footswitch connected to jack 19 or 20.
Once a footpedal is connected, the channel selector pushbutton is deactivated.
13 Master:
Master volume control for power amp output. The feature to switch between two Master
volume levels (V.L.S. - Lo or Hi) can be accessed by means of the respective footswitch connected to
jack 19 or 20. Adjust the ratio between the two volume levels with the "V.L.S. Ratio" pot
(see chapter 18).
14 Stand By:
Power amp standby switch: Use this switch to silence (0 position) the amp when you
take a lengthier break. The amp's tubes stay warm, which means that it is ready to roll immediately
when you switch it back to full power. The standby switch is also well-suited for muting the amp for
brief breaks, for instance when you're switching guitars.
15 Power:
AC power on/off.
19
21
25 26 27 28 29
30
31
32
F
OOTSWITCH
F.X. L
OOP
S
END
R
ETURN
B
ALANCE
L
EVEL
L
INE
O
UT
F
REQUENCY
C
OMPENSATED
P
OWERAMP
O
UTPUT
DRY EFFECT
V.L.S.
R
EVERB
B
ALANCED
L
INE
O
UTPUT
All-tube
Guitar Amplifier
Screamer 50
C
OMBO:
T
YPE
E330
H
EAD:
T
YPE
E335
Amp-Design by
Horst Langer
MADE IN
GERMANY
DO NOT OPEN !
RISK OF ELECTRIC SHOCK !
DO NOT EXPOSE THIS
EQUIPMENT TO
RAIN OR MOISTURE !
CAUTION !
!
C
LEAN
/ L
EAD
G
AIN
L
O
/H
I
C
AUTION
!
Connect To
Custom
Footswitch
Only !
C
USTOM
F
OOTSWITCH
P
ORT
OVERLOAD
GROUND
TO PIN 1
GROUND
LIFTED
L
INE
O
UT
G
ROUND
REPLACE FUSE
ONLY WITH SAME
TYPE AND RATING !
V.L.S.
R
ATIO
8
16
OR
16
AND
OR->
16
8
OR
8
AND
16 O
HMS
S
ERIAL
1 x 16 O
HMS
(U
SE
L
EFT
J
ACK
!)
2 x 8 O
HMS
8 O
HMS
P
ARALLEL
1 x 8
O
HMS
2 x 16 O
HMS
C
OMBO:
I
NTERNAL
S
PEAKER
R
