6
B.
INPUTS
There are two (2) female inputs. One accepts a balanced
cable with a male XLR connector; the other is to accept a
cable with a single-ended, RCA type male connector. These
input connections are located on the right (facing the back)
rear of the chassis, with the balanced input closest to the side
edge. Between the inputs, there is a switch to select one of
two pin configurations for a balanced cable (i.e., it changes
the phase). The top position is for pin 2” hot” and pin 3
“cold”; the bottom position is for the reverse (in both cases,
pin 1 is ground). Please refer to Figure 4
C.
SPEAKER TERMINALS
The A-6000 is equipped with one pair of high-quality speaker
terminals. These terminals are located in the middle of the
rear panel of the A-6000 chassis, with the terminal for the live
connection marked positive “+” on the left, and with the
ground connection labeled negative “-”, to the right (facing
the chassis rear). Between the plus and minus terminals is a
switch that provides for either 8 or 4 ohm impedance, as your
speakers may require. The upper position of the switch is for
8 ohm operation; the lower for 4 ohm operation. 8 and 16
ohm terminals are available by special order. The terminals
accept bare wire (not recommended) and spade and banana
type connectors. Please refer to Figure 4.
D.
POWER CONNECTION
Connect the input interconnect and speaker cables
before you insert the power cable into the receptacle at
the left (facing the back) rear of the chassis. The A-6000
uses a standard three prong male IEC connection for AC
input. You need to use a power cord with a female
three prong IEC connector at one end. Please refer to
Figure 4.
The A-6000 you have purchased is set internally for AC
110/120 volt – 60 HZ operation. There is no way to
change this to another AC setting without return of the
unit to the factory for re-wiring, at the owner’s cost,
including transport both directions.
INITIAL POWER-ON
Once you have your A-6000 in place and all connections
have been made to your turntable and preamplifier, you
are ready to turn on the power for your A-6000. Before
you power up the A-6000, though, be sure you have:
removed ALL the cushion materials from inside the tube
chimneys
selected the input connection that you want to use, single
ended (RCA) or balanced (XLR), on the switch on the back of
the chassis and have the interconnect firmly attached.
turned on your source(s) and your preamplifier, and turned
the preamplifier’s volume control down to zero or otherwise
muted its output
securely and correctly fastened the speaker cables and
ensured that they are also connected properly to the
speakers
checked that all tubes are snug in their sockets
Turn on the A-6000 by pushing the on/off vertically mounted
rocker switch, located at the front of the right side panel (facing
the front of the unit) to the “on” position. The “on” position is
with the vertical line on the switch (the upper portion)
depressed and the part of the switch marked with the “o” (the
lower portion) in the raised position. Of course, the off position
is the reverse. After about a thirty to forty (30 - 40) second delay
(the soft start), the A-6000 will be powered on.
OPERATION
When the power is on, the current meters on the top plate of
the chassis will illuminate. From this point on, operation is
straight-forward.
When you are finished listening, turn off your A-6000(s)
monoblock(s) first; then, turn off your preamplifier and sources.
In the case of any failure, please contact Hammertone Audio for
assistance.
THE CURRENT METERS
These illuminated meters indicate the current supply to each of
the four 300B gain tubes in the A-6000. There is one current
meter for each 300B. There is also a potentiometer and a fuse
for each 300B. (Refer to Figure 5).
When you turn on the A-6000, the needle of each current meter
should be between the two parallel lines on the meter face. Any
error of current supply to or failure of a 300B tube is indicated
by the needle on the 300B tube’s respective meter moving out
from between these two parallel lines.
