OROSYS Two Notes Torpedo Reload II User Manual page 6

Last update: 2025/02/19 15:44
Recommendation on the Proper use of a
Load box with a Tube Amplifier
1. What is a Load Box?
In routine use of a tube amplifier, it is highly recommended that the power output of the amplifier is
always connected to a speaker cabinet or suitable load prior to powering on. The speaker cabinet
(rated at either 4-, 8- or 16-Ohms) must always be connected to the corresponding speaker output of
the amplifier. Neglecting to do so can lead to partial or complete destruction of the output stage of
the tube amplifier.
The majority of tube amplifier designers protect their products with fuses or alternative suitable
protection systems; however, some amplifiers are still insufficiently protected. It is therefore
impossible to predict the behavior of all amplifiers on the market in relation to the instantiated load
(be it a speaker cabinet or a Load Box).
The electronic term that describes the speaker cabinet with respect to the amplifier is the "load": we
say the cabinet "loads" the amplifier. The term "Load Box" is used to describe any product that
provides a load to the amplifier. The main parameter of the Load Box is its impedance, expressed in
Ohms. Impedance matching between a Load Box and amplifier is paramount and as such should be
actioned wherever possible (i.e. an 8-Ohm Load Box must be plugged to the 8-Ohm speaker output of
the related amplifier).
The power sent by the amplifier to the corresponding load is turned into heat; as such, it is vital to
refer to the cooling recommendations stipulated in the manual of the respective load; overheating
may cause damage, both to the Load Box and to the amplifier.
Warnings & Setup Considerations
Always connect the speaker out of your tube amplifier to an appropriate load
(speaker cabinet or Load Box). Reload II, once powered, is such a load. Always
power on Reload II before your amplifier. The maximum admissible power of
Reload II is 200W RMS.
Always ensure the impedance rating of your amplifier's speaker output is
matched to the AMP IMPEDANCE setting on Reload II; failure to ensure a correct
match may result in irreversible damage to your amplifier or Load Box.
Always use a Speaker Cable for connections between the amplifier's speaker out
and Reload II's Reload AMP IN. Always use a Speaker Cable for connections between
the Reload IIs CAB OUT A/B and any connected cabinets. Using an Instrument Cable
instead of a Speaker Cable can cause significant damage to your amplifier or Reload
II, ultimately requiring service by a qualified technician. If unsure about the
classification of your cabling, please seek advice from a qualified specialist.
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Printed on 2025/02/19 18:22