Decware SE84UFO3 User manual

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Owner’s Manual
Model!
S E 8 4 U F O 3"
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INPUT - USE
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U.-AH10<D--?CG
SYMPTOM
CAUSES
REMEDIES
Hum through
speakers
Ground Loop
Plug power cord into a
different outlet.!
!
Install 2-pin adapter on
power cord plug to float
the ground.
Intermittent ground
or shield wire in
interconnect cable
Replace interconnect
cable.
Noisy Input Tube
Replace Input Tube.
Bad Rectifier Tube
Replace Rectifier Tube.
Unshielded
Interconnect used
Re-route cable away
from power supplies and
power cords or replace
with shielded cable.
Digital Light
Dimmer’s on same
circuit
Turn off digital dimmers.
WIFI bridge or
router nearby
Locate farther away
from audio components
Hum from amp itself
Chattering rectifier
tube
Tap on tube to see if
chattering stops and if
so replace rectifier tube.
Power transformer
Poor voltage or over
voltage at the wall outlet
can cause an increase
in power transformer
vibration, correct
voltage.
Relocate amp to middle
of room to see if
transformer hum
reduces. If so, the shelf
or rack the amp was in
can be changed.

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SYMPTOM
CAUSES
REMEDIES
Popping or Spitting
noise
Noisy tube
Replace noisy tube
Wifi router or bridge
nearby
Locate away from audio
components
AC fuse blows
Line voltage surge
Replace fuse
Rectifier Tube Arced
on initial startup
If it continues, replace
rectifier tube and fuse.
Fuse is too small
Install correct amperage
fuse. If amperage IS
correct and fuse blows,
use a SLOW BLO fuse
of the same amperage.
One Channel stops
working
No signal to that
channel
Take the cable from the
channel that works and
put it into the channel
that stopped working. If
it starts working, the
amp is fine, but you
have either a bad cable
or problem with your
preamp or source
component.
Speaker cable came
unhooked
Reinstall speaker cable.
Output tube failed
Replace output tube.
Channel imbalance
Output tubes no
longer match
Replace output tubes
with a matched pair.
Input tube sections
no longer match
Replace input tube with
a new input tube that
has matched sections.
Speaker HI/LO
impedance switches
are not set the
same.
Adjust the HI/LO
switches the same for
each channel.
U.-AH10<D--?CG

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U.-AH10<D--?CG
SYMPTOM
CAUSES
REMEDIES
Amp won’t turn on
Blown Fuse
Replace fuse
Power cord is not
pushed in all the
way or intermittent
Check power cord,
replace if necessary.!
Tubes light up but
no sound
Rectifier tube is bad
even though it still
lights up
Replace rectifier tube.
Volume control is all
the way down.
Increase volume control
level
The source switch is
set to the wrong
source
Adjust the switch to the
other position.
Your source is not
playing
Start source
Interconnect cables
are unhooked
Reinstall interconnect
cables.
Incorrect tubes are
installed
Install correct tube types
tubes are installed
in the wrong
locations
Reinstall tube in the
correct locations.
Sound is real weak
Source switch set to
wrong source
Reduce volume and
Adjust source switch.!
Sound is getting
weak
Tubes are past
rated life of 3000
hours
Replace tubes.
Sound drops out on
both channels and
comes back on
Power cord is loose
Check power cord,
replace if necessary.!

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DATE INSTALLED
TUBE TYPE
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