harmonics when turned counter-clockwise for a smoother tone. Affects both channels, but is
more noticeable on overdrive settings when more high harmonics are present.
Resonance: Adds deep resonant bass to both channels. Lower settings provide a “tighter” low
end response, while higher settings give greater low end response.
Note: This control is more
effective with closed-back speaker cabinets, and even more exaggerated with larger enclosures
and certain speakers.
Off/Standby/Play switch (3-way): To turn on the amplifier, flip the switch from the down to
middle position. The amp is now in Standby. Standby mode mutes the sound and allows the
tubes to heat up before applying high voltage in Play mode. Leave in this mode for 30 seconds
to a 1 minute before switching into Play mode (up position). Standby can also be used to mute
the amplifier while leaving the tubes warm short breaks. For long breaks it is best to turn the
amplifier completely off.
To turn off the amplifier, follow the same turn-on procedure in reverse – allowing the amp to
idle in Standby mode for about 30 seconds before powering off. While it is perfectly okay to
turn the amp off immediately, idling in standby before powering off lets the filter capacitors
inside the amp fully discharge. If turned off immediately, there will still be some sound as the
filter caps continue to discharge.
Rear Panel
120 VAC power input: Plug in the included standard IEC power cord here. For use with 120
VAC (USA) only unless otherwise specified.
WARNING!: Use with grounded power outlet only! Discard power cord immediately if
ground pin is damaged/broken. The ground connection is for your safety in case of a
fault!
Footswitch jack: Plug included 1-button footswitch here. Plugging in the footswitch over-
rides the front panel Channel switch.
Speaker Jacks and Impedance Selector
Note: Speakers must be rated for at least the full rated clean output power of the
amplifier (100W). Under overdrive conditions, the clean power can be exceeded by
tens of watts, therefore it is preferable to use speakers whose combine power rating
exceeds the clean power rating. This topic is up for debate as some speaker
manufacturers rate their speakers with this knowledge in mind (i.e. four 25W rated
speakers may be OK for a 100W amp).
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