Chapter Nine: Maintenance and Cleaning
9.1 Cleaning
Never use a wet method of cleaning the amplifier, i.e. 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.
9.2 Care
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 its 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.
You’ll hate it if this happens, guaranteed!
9.3 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 three circuit bias system. It is quick and
easy to accomplish biasing, but involves removing the chassis and use of specialized equipment for
measuring currents inside the amplifier. Only trained professionals should attempt this procedure.
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