7
delay (the soft start), the A-2000 will be powered on.
OPERATION - CHASSIS AND REMOTE CONTROLS
When the power is on, the current meters on the face of the
chassis will illuminate. From this point on, the T-2000’s
operation is straight-forward. The face of the chassis has an
input selector control knob and a volume control knob (see
Figure 4. The remote control (Figure 6) will also control the
input selections and the volume. It will not control the power
to the T-2000, which must be switched on and off manually,
as described above. Remove screws on the bottom of the
remote control to replace batteries.
When you are finished listening, turn off your T-2000 stereo
amplifier(s) first; then, turn off your preamplifier and sources.
If the T-2000 is in triode mode at turn-off, it will produce a
sound through the speakers as the amplifier’s relays turn
off. Though this sound is harmless to speakers, some users
may prefer not to hear it. To avoid the sound, simply switch
the T-2000 to pentode mode prior to turning it off (see the
“On-the-Fly Triode/Pentode Switching section below).
In the case of any failure, please contact Hammertone Audio
for assistance.
THE CURRENT METERS
The two illuminated meters indicate the current supplies to
the four KT120 power tubes in the T-2000. Between and to
the outside of each channel pair of KT-120’s is a small toggle
switch. Pushing the toggle toward the rear of the chassis
allows you to read and use the meter to bias the rear KT120;
pushing the toggle toward the front switches the meter to
the front KT-120. You can use the toggle during operation.
There is a potentiometer for each KT120 (Refer to Figure 7).
When you turn on the T-2000, the needle of the current
meter for each KT120 should be between the two parallel
lines on the meter face. Any error of current supply to or
failure of a KT120 tube is indicated by the needle on the
meter moving out from between these two parallel lines.
If a meter’s needle drops to the left limit of the meter’s face
during operation, this indicates a failure of the related KT120
tube. You must turn off the T-2000 and replace both the fuse
(0.5A, 250V, 20mm glass type) for that tube and the KT120.
To replace a fuse, unplug the T-2000; then, using a
screwdriver, simply turn the top of the fuse cap counter
clockwise. It will spring out holding the fuse. Replace the fuse in
the fuse cap, push the fuse cap down and turn it so it locks. If
you have any questions about doing this, please contact
Hammertone Audio for assistance.
TUBES AND TUBE BIAS
The T-2000 uses the following tubes:
Two (2) x KT120
Two (2) x D3a
Two (2) x 6485
Because of the individual bias for each KT120, it is not
necessary to use matched KT120 tubes in the T-2000.
You may use any KT120 type tube in the T-2000. 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 7 for tube locations.
CAUTION: If you intend to change KT120’s, ensure that you
use the potentiometers to trim back the bias below (to the
left of) the parallel lines on the meters first.
This will prevent
the new pair of KT120’s from drawing too much current at
first turn-on (not an uncommon characteristic) and tripping
the power fuse at the IEC connection. No harm is done to the
original tubes by turning the bias down, nor is any harm done
to the new tubes by having them biased low to start. Once the
new tubes are installed and the T-2000 is on, use the
potentiometers to adjust the bias so the needles for each
meter are again between the two parallel lines on the meter.
If the current meter for one of the unit’s KT120’s 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.
As with all tube equipment, changing tubes from one
manufacturer’s to another’s may alter the sonic
characteristics of the equipment.
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 T-
2000, any of its parts, or tubes or replacement tubes resulting
from the user changing or attempting to change tubes.
