7.6 Phantom Power
The two outer pins of the Midi port can supply power to the midi controller pedal. See
3.5.1
Chapter 8
Cleaning and Servicing the VH4/VH4S
8.1 Cleaning
Never use a wet method of cleaning the amplifier. Any amplifier. Usually it is sufficient to
wipe down the outside of the amp with a slightly moist cleaning rag. Do not use abrasive
cleaning chemicals. Sometimes a vacuum cleaner can be used to remove dust and dirt
from nooks and crevices. Do not remove the chassis from the housing to clean the amp.
The inside of your amp carries dangerous Voltages.
8.2 Care and Feeding
Be gentle with this Amplifier. Any mechanical shocks and wide temperature changes,
moisture rich environments and extreme conditions ( dust, wind, heat, cold, moisture) can
substantially shorten tube life, in some cases even amplifier life.
Do not block the air circulation grilles in the front and in the back of the amp. Do not push
the amp right up against objects that would interfere with it’s normal airflow. The top of
the amplifier might get warm after prolonged use, this is normal, but will melt your ice
cream and definitely ruin your beer. Never put beverages on top of the amp where they
could spill and flow inside the amplifier. This would be very bad overall.
Get it?
8.3 Tube Change
Tube changes are only to be undertaken by authorized service personnel. If Power tubes
with different values then the original ones are to be installed, then the amplifier must be
re-biased before operation can be resumed. The amplifier uses a hard wire bias system. It
is quick and easy to accomplish biasing, but involves removing the chassis and
soldering/measuring currents inside the amplifier. Only trained professionals should
attempt this procedure.
Salwender International and the Diezel Company wish to express their gratitude and
congratulate you for your decision to purchase the Diezel VH4 or VH4S Amplifier.
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