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ALLNIC AUDIO A-5000 DHT Manual del usuario

1. Tubes and Tube Bias

THE CURRENT METER

The illuminated meter on the front of the chassis (see Figure

5 indicates the current supply to the 300B tube in the A-5000

DHT. There is a potentiometer that is used to bias the 300B

(Refer to Figure 6 for its location. When you turn on the A-

5000 DHT, the needle of the current meter should be

somewhere between the two parallel lines on the meter face.

Any error of current supply to or failure of the 300B tube is

indicated by the needle on the meter moving out from

between these two parallel lines.

If the current meter 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 the 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.

If the meter's needle drops to the left limit of the meter's

face during operation and audio output stops, this indicates a

failure of the 300B tube. The fuse will have "blown" as well.

You must turn off the A-5000 DHT and replace both the fuse

(315mA @ 250V, 20mm glass, fast blow type for the tube

and the 300B. To replace a fuse, using a screwdriver, simply

turn the top of the fuse cap counter clockwise. It will spring

out holding the fuse. Replace the fuse, push the fuse cap

down and turn it clockwise; it will lock itself. If you have any

questions about doing this, please contact Allnic Audio

USA for assistance.

You may use any 300B type tube in the A-5000 DHT, including

the newer higher voltage varieties (300BXLS, which will

operate at their optimal specification. Of course, before

changing a 300B, you should turn the bias potentiometer

down. Then when you have inserted the new tube, 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.

Please refer to Figure 6 for tube locations.

All consequences of changing or attempting to change tubes

are borne by the user unless by express agreement between

the owner and Allnic Audio USA. Allnic Audio

Allnic Audio USA are not liable in any way whatsoever for

any injury or loss incurred by the user or for damage to the

A-5000 DHT, any of its parts, or tubes or replacement

tubes resulting from the user changing or attempting to

change tubes.

SPECIFICATIONS FOR THE ALLNIC AUDIO A-5000 DHT

MONOBLOCK POWER AMPLIFIER

 Output Power:

 Distortion:

 Frequency Response:

 S/N Ratio:

 Damping Factor:

 Voltage gain:

 Input Impedance:

 Input Sensitivity:

 Tubes:

 AC Fuse:

 Dimensions:

 Weight:

and

10W (8Ω or 4Ω load, at 1KHz)

0.5% at 1KHz, 2.83V

20Hz - 20KHz Flat

-76dB (CCIR, 1KHz)

4.7 at 8Ω load at 1KHz

+24dB

100KΩ (single-ended, unbalanced)

0.6V for rated power

300B or 300BXLS X 1 (power

triode)

HL-2 X 1 (input tube – no

equivalent)

3A-110A x 1 (driver tube –

equivalent = WE 101FA)

5U4G x 1 (May use any octal pin

rectifying tube, e.g., GZ34).

Main: 3A @ 250V 20mm glass, fast

blow type (two supplied – one is a

spare)

300B: 315mA @ 250V, 20mm

glass, fast blow type

(W x D x H) 430mm (16.93 inches)

x 330mm (13 inches)

x 240mm (9.45 inches)

20Kg (44 lbs) net per monoblock.

21.8 Kg (48 lbs) shipping weight

per monoblock.