Operator`s manual

all possible, avoid operating the amp at temperatures far higher than 30°C for longer

periods. Running the amp at mains voltages exceeding the nominal mains input

voltage over longer periods can also shorten component life.

Replace tubes with selected tubes that satisfy ENGL selection criteria to forestall

microphonic properties, undesirable noise and unbalanced power amp signals.

Because power tubes' idle current (bias) must checked and possibly adjusted when

replacing tubes, this is a job best left to experienced and authorized specialists.

In this manual, MIDI programs are called presets and patches.

Though the MIDI standard defines program numbers 000 to 127, almost all MIDI

devices and foot boards indicate and control these programs using a 1-to-128

numbering scheme.

MIDI specifications define 16 channels for sending and receiving MIDI data. The

encoding buttons on the back of the amp determine the MIDI data receiver channel.

MIDI channels: 1 to 16, or OMNI (meaning that all 16 channels receive MIDI data).

This option lets you access the amp's Amp Mute function via a suitable MIDI foot

board. This foot board must like the ENGL Z-15 - be able to send MIDI controller #07

data. In order to afford access to , this function must be enabled using the

corresponding encoding button on the back of the amp.

Glossary

MIDI Preset:

MIDI Channel:

MIDI Volume and Master Volume Mute, :Amp Mute

Amp Mute

Power Tube Monitor:

An electronic surveillance system that monitors each power tube's current and shuts

the given tube down when it detects a value that is too high.