Zesto Audio 2015
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P a g e
9
Installing Tubes
This EROS 300 ships with a matched sextet of KT88’s so they can go in any socket V1 thru V6. KT88’s have a key and
can only go in one way.
Tip:
The logo and the key on the tube faces forward.
Caution! Do not ROCK the tube,
install straight up and down holding the metal collar. If you look at the bottom of the
tube there is a black plastic cylinder in the center of the pins with a key. This plastic is fragile and can easily break if you
rock the tube. Broken keys are not covered under warranty. However a broken key does not affect the performance of the
tube or the amplifier.
WARNING! If the tube is not installed in the correct orientation it is likely that you will do permanent damage to
the amplifier with a considerable amount of drama.
ECC82/12AU7 tubes only go in one way in any socket V7 thru V8
Hookup, Settings and Adjustments
Before you start you will need:
RCA or XLR Interconnect, power and speaker cables to your system.
Output
Using speaker cables connect the speakers to the common and either 4 or 8 Ohm output binding posts. You can also
connect the speaker cable using a 4 pin SpeakOn connector.
SpeakOn Wiring Diagram
4 Ω
1 +
1 -
8 Ω
2 +
2 -
Input
Using RCA or XLR interconnect cables; connect your preamp to the input of the power amp. You have a choice
,
balanced cables are preferred
for sonic reasons as well as it will allow you to use the ground lift switches if you
encounter any ground loop problems.
Power
Important!
Power amps need good clean power.
For best results it is recommended to plug the EROS 300 directly into an AC wall outlet with a proper ground and not
through any power conditioner, extension cord or power outlet strip. Carefully plug in the AC power cable to the power
amp first then into the wall outlet.
Turn it on
Turn on the power amp using the ON/OFF switch located on the front logo plate. The amber LED indicates low voltage
and the red LED indicates high voltage. Both lights will go on together and will remain illuminated while the unit is on. The
eight tubes should start glowing.
If they
don’t glow, turn off the unit at the power switch and unplug the power cord. After waiting a few minutes unplug each
vacuum tube in turn (using the glove provided) and make sure that none of the pins are bent. If the pins are bent please
contact Zesto Audio for instructions
