ALLNIC AUDIO KT-150 Manual do Proprietário - Página 7
Procurar online ou descarregar pdf Manual do Proprietário para Amplificador ALLNIC AUDIO KT-150. ALLNIC AUDIO KT-150 10 páginas. Push-pull stereo power amplifier
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In the case of any failure, please contact Allnic
Audio for assistance.
"ON-THE-FLY" TRIODE/PENTODE SWITCHING
You can use the Triode/Pentode "Mode Selector"
button at any time during operation to switch back
and forth from Triode to Pentode operation. Press
the mode selector button down to have the A-2000
th
25
anniversary operate in Triode mode; press the
button again so it is in the raised position to have
th
the A-2000 25
anniversary operate in Pentode
mode.
THE CURRENT METERS
The two illuminated meters indicate the current
supplies to the four KT150 power tubes in the A-
th
2000 25
anniversary Between and to the outside
of each channel pair of KT-150's is a small toggle
switch. Pushing the toggle toward the rear of the
chassis allows you to read and use the meter to bias
the rear KT150; pushing the toggle toward the front
switches the meter to the front KT-150. You can use
the toggle during operation.
There is a potentiometer for each KT150 . When
you turn on the A-2000 25
of the current meter for each KT150 should be
between the two parallel lines on the meter face.
Any error of current supply to or failure of a KT150
tube is indicated by the needle on the meter
moving out from between these two parallel lines.
If a meter's needle drops to the left limit of the
meter's face during operation, this indicates a
failure of the related KT150 tube. You must turn off
th
the A-2000 25
anniversary and replace both the
fuse (0.5A, 250V, 20mm glass type) for that tube
and the KT150.
To replace a fuse, unplug the A-2000 25
anniversary; then, using a screwdriver, simply turn
the top of the fuse cap counter clockwise. It will
spring out holding the fuse. Replace the fuse in the
fuse cap, push the fuse cap down and turn it so it
th
anniversary, the needle
locks. If you have any questions about doing this,
please contact Allnic Audio for assistance.
TUBES AND TUBE BIAS
th
Each A-2000 25
tubes:
• Four (4) x KT150
• Four (4) E282F
• Two (2) x 6AK6
Because of the individual bias for each KT150, it is
not necessary to use a matched quad of these
power tubes in the A-2000 25
If the needle of a current meter for a KT150 has
moved to the left of the parallel lines on the meter
face, using an appropriately bladed screwdriver,
adjust the potentiometer directly in front of that
tube's location by turning it clockwise until the
needle has returned to between the meter's
parallel lines. If the meter needle has moved to the
right of the parallel lines on the meter face, turn the
potentiometer control counter-clockwise to correct.
You may use any KT150 type tube in the A-2000
th
25
anniversary. Of course, you will have to adjust
the bias back into the area between the two
parallel lines of the meter for a tube when it is
replaced.
CAUTION: If you intend to change KT150's,
ensure that you use the potentiometers to trim
back the bias below (to the left of) the parallel
lines on the meters first.
new pair of KT150's from drawing too much
current at first turn-on (not an uncommon
characteristic) and tripping the power fuse at the
IEC connection. No harm is done to the original
tubes by turning the bias down, nor is any harm
th
done to the new tubes by having them biased low
to start. Once the new tubes are installed and the
th
A-2000 25
anniversary is on, use the
potentiometers to adjust the bias so the needles
for each meter are again between the two parallel
lines on the meter.
7
anniversary uses the following
th
anniversary.
This will prevent the