OPERATION MANUAL MODEL : MINITORII - DESKTOP AMPLIFIER
REV 1 MAR 2018
Operation and Setup
!
To operate your amp, carefully install the tubes and hook up the output jacks to the
speakers. Once you are sure the speakers and amp are securely connected together
with a high quality RCA cable you may then plug the amplifier into the wall outlet.
Before you turn it on make sure that both volume controls are turned all the way
down.
Turn on the amplifier. The amplifier will come on after about a 20 second warm up.
As it warms up turn the adjustable feedback control fully clockwise on each
channel. Your system is now on and at idle. Any noise or hum that you hear is your
system reference. Make a note of it so that later when we connect the sources we
can see if they added any additional noise or hum.
It is now time to connect your first source component to one of the input pairs on
the amp. You can do this while the amplifier is on and at idle, but be sure you
haven’t turned either volume control up yet.
If you didn’t hear any hum or noise increase when you connected your first source
that means that A) your cables are probably good and B) there is no ground loop
happening in the cables between the two components.
Now add your second source if you have one and again listen for any increase in
the noise or hum.
If with either source you DO notice an increase in noise or hum then it likely comes
from cables, small ground loops between the amp and source or the source
component itself. If you have to put your face in front of the loudspeaker to hear
the noise and hum then it’s acceptable. If on the other hand you can hear it from
the listening chair then it’s not acceptable and should be corrected before going
further.
Once everything is connected and warmed up and you are happy that there is no
excessive amounts of noise or hum you can proceed to listen to some music. If you
have only one source on and you don’t hear music when you raise the volume, flip
the source switches.
You should be able to listen to music at this point. Once you have listened to it for
awhile you can experiment with the adjustable feedback controls. Counter
clockwise rotation lowers feedback and raises gain simultaneously. The effect is
more detail and more brightness. Usually one or two clicks will do it. There is no
additional effect past four or five clicks.
Whatever the background level of noise and hum is it will increase as you lower
feedback. So lowing the feedback increases gain and noise and hum along with it
so it is not recommended for headphone use.
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