7
TUBES AND TUBE BIAS
Each A-6000 uses the following tubes:
Four (4) x 300B
One (1) x 6GV8
Because of the individual bias for each 300B, it is not
necessary to use a matched quad in the A-6000.
If the needle of a current meter for a 300B 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 300B
tube. You must turn off the A-6000 and replace both the fuse
(0.5A, 250V, 20mm glass type) for that 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 Hammertone Audio for assistance.
You may use any 300B type tube in the A-6000, including the
newer higher voltage varieties. 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. Please refer
to Figure 5 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 Hammertone Audio. Allnic Audio and
Hammertone Audio are not liable in any way whatsoever for any
injury or loss incurred by the user or for damage to the A-6000,
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-6000 300B SET
MONOBLOCK POWER AMPLIFIER
Output Power: 50w (8
Ω load, at 1KHz)
Distortion: 0.3% at 1KHz, 2.83V
Frequency Response: 20Hz - 20KHz Flat
S/N Ratio: -80dB (CCIR, 1KHz)
Damping Factor: 10 at 8
Ω load at 1KHz
Voltage gain: +24dB
Input Impedance: 100K
Ω
(single-ended, unbalanced)
Input Sensitivity: 0.7V for rated power
Tubes: 300B X 4 (power triode)
6GV8 X 1 (driver tube - equivalent to
ECL85)
Dimensions: (W x D x H) 430mm (16.93 inches) x
470mm (18.51 inches) X 240mm
(9.45 inches)
Weight: 40Kg (88.2 lbs) net per monoblock.
55Kg (121 lbs) shipping weight per
monoblock.
WARRANTY
All Allnic Audio amplifier products are warranted against materials and manufacturing defects for parts, excluding tubes, and
labour for two (2) years from date of purchase. Tubes are warranted against materials and manufacturing defects for one (1) year
from date of purchase. The warranty is transferable for the balance of the original purchaser’s warranty period, provided, as
stated below, no unauthorized repairs or modifications have been performed on the product. Date of purchase is the date
indicated on the invoice for the product issued by Hammertone Audio.
For the warranty to be valid, a defective product must be returned to Hammertone Audio for service prior to any unauthorized
attempt to repair. Any repair work on an Allnic Audio product not specifically authorized by Hammertone Audio will void the
warranty on the product.
