ALLNIC AUDIO M-2500 Посібник користувача - Сторінка 9
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In the case of any failure, please contact Your Allnic dealer for assistance.
THE CURRENT METERS
The illuminated meters indicate the current supply to each of the PX25/300B/KT150 power tubes in the M-
2500s. There is one current meter (See Figure 7). Flip the toggle switch, located in the middle of the front
of the chassis top (See Figures 7 and 8), to switch the meter to read either the left or right
PX25/300B/KT150 power tube. There is also a screw type potentiometer on the chassis top in front of each
PX25/300B/KT150.
When you turn on the M-2500s, the needle of the current meter should be between the two parallel lines
on the meter face. Any error of current supply to or failure of a PX25/300B/KT150 tube is indicated by the
needle moving out from between these two parallel lines.
TUBES AND TUBE BIAS
Each M-2500 monoblock uses the following tubes (See Figure 8):
• Two (2) x PX25/300B/KT150
• One (1) x 6485 and two (2) x 12A4 (300B version)
• One (1) x 5654 and two (2) x 12A4 (PX25 version)
• One (1) x 5654 and two (2) x 6S4 (KT150 version)
• One (1) x 5U4G (Substitute with equivalent direct-heated rectifiers only)
Because of the individual, user adjustable bias for each PX25/300B/KT150, it is not necessary to use a
matched pair of these power tubes in the M-2500s.
If the needle of a current meter for a PX25/300B/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.
If a meter's needle drops to the left limit of the meter's face during operation, this indicates a failure of the
related PX25/300B/KT150 tube. You must turn off the M-2500s and replace the PX25/300B/KT150. If you
have any questions about doing this, please contact your Allnic dealer for assistance.
If the 5.0 Amp AC mains fuse, located at the IEC input, has failed, it can be replaced with the spare fuse
provided in the tray in the IEC mount. Again, if you have any questions about doing this, please contact
your Allnic dealer for assistance.
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. When replacing a PX25/300B/KT150, first turn the bias screw counter-
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