ALLNIC AUDIO A-5000 DHT Gebruikershandleiding - Pagina 9
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When you turn on the A-5000 DHT, the needle of the current meter should be in about the middle 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-hand most of the parallel lines on the meter face, or beyond it,
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 close to the right-hand most parallel line on the meter face, or to the right of it, turn the
potentiometer control counterclockwise 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 counterclockwise. 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 your Allnic dealer 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 if the needle of the illuminated meter is set to
just inside the right-hand most of the meter's two parallel lines.
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, as described above. 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 an authorized Allnic representative. Allnic Audio and its authorized
representatives 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.
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