Safety Instructions

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6.3. Tube Replacement
In the case of a damaged vacuum tube , contact the manufacturer or your dealer for ordering a new one.
We will provide instructuions for replacing the tube. Replacement should be done by a professionally
qualified person! After tube replacement the automatic BIAS adjustment procedure must be done.
6.4. Cleaning
To prevent damage to the amplifier surface and plastic components, do not use aggressive chemicals for
cleaning. Do not open the amplifier for cleaning. Outer surface cleaning may be safely accomplished by
using a piece of soft cotton cloth moistured with clean water or window cleaner.
7. APPENDIX
7.1. Primary AC voltage selection
Primary section of the HV transformer is switchable for three values of AC voltage (230, 240, 250V)
Factory settings is 240VAC. Before first starting the PA we recommend checking that the correct value is
selected according to the AC voltage in your network.
Side view on the opened OM4001A
HV supply board AC Selector SW ON board
HV Transformers