ALLNIC AUDIO KT-150 Owner's Manual - Page 7

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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

anniversary operate in Triode mode; press the

button again so it is in the raised position to have

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-

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

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

anniversary, the needle

locks. If you have any questions about doing this,

please contact Allnic Audio for assistance.

TUBES AND TUBE BIAS

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

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

done to the new tubes by having them biased low

to start. Once the new tubes are installed and the

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.

anniversary uses the following

anniversary.

This will prevent the