Rear Panel
15
16 17
19
20
13 14
13 AC Socket:
Connect 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.
14 AC Fuse Box:
Contains mains fuse (rear chamber) and spare fuse (front chamber).
NOTE:
Ensure replacement fuses bear identical ratings (refer to the table)!
15 Footswitch: Clean / Lead; Crunch / Lead
1/4" stereo jack for double footswitches, executes the following functions:
1. Channel switching Clean/Lead (mono terminal)
2. Channel switching Crunch/Lead (stereo terminal).
Impotant Note:
You can use standard two-way 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.
16 FX Loop: Send
Signal output for
the Effects loop. Connect this output to a signal processor’s
input/return jack via a shielded cable with 1/4" plugs.
17 FX Loop: Return
Signal input for the Effects loop. Connect this input to a signal processor’s
output/send jack via a shielded cable with 1/4" plugs.
18 Balance:
FX mix control for the Effects loop: Rotate the knob to the Dry position for the pure
amp signal, i.e. no effect on the signal. Turn clockwise to blend in an effect connected to the loop
to the dry signal (parallel/passive). At the Effect position, only the wet signal, i.e. the signal
sent from the FX device is fed to the power amp (serial/passive).
NOTE:
If no effects processor is connected to this loop, leave this control in position Dry!
19, 20 Poweramp Output: 8 Ohms, parallel
Parallel 8-ohm speaker outs, connected internally in parallel. Connect an 8-ohm cabinet or,
in the case of the Combo E320 and E322, its internal speaker here. Alternatively, two 16-ohm
cabinets can also be connected to these two outputs.
21 Poweramp Output: 16 Ohms, serial
16-ohm speaker out, connected internally in series with Jack 22. Connect a 16-ohm cabinet here.
Two 8-ohm speakers are connected to Jacks 21 and 22, for example a combination of the internal
8-ohm speaker of the Combo E320 (E322) and an external 8-ohm cabinet,
e.g. the ENGL models E112 or E412.
C
AUTION: If you intend to use a 16-ohm cabinet only, make absolutely certain you
connect it to Jack 21! Jack 22 is only enabled when a speaker is connected to jack 21.
22 Poweramp Output: 16 Ohms, serial
16 ohms serial. This is an auxiliary output connected in series with Jack 21. This jack is designed
for one application for only—when you are driving a combination of two 8-ohm cabinets/speakers.
This output may only be used when an 8-ohm speaker is connected to Jack 21.
(See the example for Item 21)
NOTE: Never operate the amplifier without a sufficient load, otherwise you may damage
or destroy the power amp! Ensure your cabinet’s specifications match the respective
output’s specs.
Possible speaker co
mbinations:
1 x 8 ohms or 2 x 16 ohms (Jacks 19 and 20) or
1 x 16 ohms (Jack 21!) or 2 x 8 ohms (Jacks 21 and 22).
18
21
22
F
OOTSWITCH
F.X. L
OOP
S
END
B
ALANCE
DRY EFFECT
SERIAL NUMBER:
WIRED FOR:
REPLACE FUSE
ONLY WITH SAME
TYPE AND RATING !
DO NOT OPEN !
RISK OF ELECTRIC SHOCK !
DO NOT EXPOSE THIS EQUIPMENT
TO RAIN OR MOISTURE !
!
C
LEAN
/ L
EAD
C
RUNCH
/ L
EAD
VOLTAGE
FUSED
100-120 V
220-240 V
2,5 A
1,25 A
P
OWERAMP
O
UTPUT
16 OHMS SERIAL
1 x 16 OHMS
(USE LEFT JACK!)
2 x 8 OHMS
8 OHMS
PARALLEL
1 x 8
OHMS
2 x 16 OHMS
COMBO: INTERNAL SPEAKER
R
ETURN
MADE IN
GERMANY
All-tube
Guitar Amplifier
Thunder 50 Reverb
TYPE E320
Thunder 50
TYPE E322
Thunder 50
HEAD: TYPE E325
Amp-Design by
Horst Langer
R
230 VOLT
098320
