DECWARE ZEN TORII MK III MANUAL
to roll off the top end frequencies should they become too loud. There is no “flat”
position of this control because it changes from one loudspeaker to another. It has to be
set by ear. One way to do this is to simply turn it all the way down (counter clockwise)
and then slowly raise it until you're satisfied with the amount of treble.
The Bass Control is not a frequency adjustment as the name would suggest. Instead
what this control does is allow you to adjust how much interaction your loudspeaker has
with the amplifier. This works by placing the voice coil of your loudspeaker in parallel
with the cathode resistor of the input stage in this amplifier. As the impedance rises the
gain of the amplifier is reduced in real time as the music plays. The control simply lets
you vary how much this happens. The result varies widely from one speaker to another
so again there is no such thing as a “flat” position on the control. In fact it can even
work backwards with some speakers, so you simply have to listen and adjust. I usually
start with the Bass Control fully counter clockwise and experiment from there.
FUSES
There is a single 5 amp fuse in the TORII MK III located inside the IEC connector for the
removable power cord. The fuse holder cleverly holds a spare fuse as well. If you ever
blow a fuse the most likely cause is one of the rectifier tubes arced on startup or simply
shorted. If a fuse blows, remove both rectifier tubes, replace the fuse and turn the amp
back on without the rectifier tubes installed. If the output tubes and the input tube light
up, turn the amp back off and install the rectifiers. If the fuse blows after the rectifier is
re-installed, then the rectifier tube is bad and must be replaced. Rectifiers can last for
30 years or fail for no reason at any time, or so it would appear. Of course there is
always a reason. Sometimes it's that the tube was beat around pretty hard during
shipping and had an early failure as the result. Sometimes it's a thunderstorm or some
other issue that caused a large voltage spike that makes them fail.
PREAMPS
If you plan to use an active preamp with your TORII MK III, you may find the best sound
is with the gain control on the TORII somewhere below “all the way up”. As a general
rule you can add weight to a recording by turning the preamp up higher and the gain on
the amp lower. The reverse is also true if a recording is too thick, just turn the gain on
the amp higher and the volume on the preamp lower.
Many users will find the transparency of the TORII MKIII to be so spectacular that only
the finest preamps will preserve it... this is why we designed the amp with a gain control
so that it can be used straight up with any line level source. Sometimes eliminating the
preamp is the answer.
Manufactured by High Fidelity Engineering Co. WWW.DECWARE.COM
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