Artemis Car Amplifier LA-1 用户手册
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the LA-1 can drive loads as low as 8K while still
meeting specifications. This is important when
driving certain solid-state amplifiers or pro audio
equipment which can have input impedances as low
as 10 or 15K ohms.
meeting specifications. This is important when
driving certain solid-state amplifiers or pro audio
equipment which can have input impedances as low
as 10 or 15K ohms.
High-Quality Conductive-Plastic Balance pots
Since a stepped attenuator allows only discrete level
steps, the balance controls are conductive plastic
pots by Spectrol®, which have a minimum impact
on the sound. By using a separate pot for each chan-
nel, the default position (fully clockwise) permits
full gain from the preamp.
steps, the balance controls are conductive plastic
pots by Spectrol®, which have a minimum impact
on the sound. By using a separate pot for each chan-
nel, the default position (fully clockwise) permits
full gain from the preamp.
Each channel individually voltage regulated
Each channel has its own MOSFET source-follower
low-gain regulator. This insures there is no coupling
between the two channels through the power supply.
The source follower regulator gives good regulation
without the “transistor sound” typical of high gain
regulators using op-amps. Protection resistors and
diodes help prevent burn-out of the MOSFETs.
low-gain regulator. This insures there is no coupling
between the two channels through the power supply.
The source follower regulator gives good regulation
without the “transistor sound” typical of high gain
regulators using op-amps. Protection resistors and
diodes help prevent burn-out of the MOSFETs.
True voltage regulation minimizes noises and
changed operating conditions due to power line
shifts. Since the impedance of the power supply,
as seen by the amplifier, is low and flat, the bass
response is even and solid.
changed operating conditions due to power line
shifts. Since the impedance of the power supply,
as seen by the amplifier, is low and flat, the bass
response is even and solid.
DC heater supply
A well-filtered DC heater supply helps keep hum
low and allows the use of tubes that would other-
wise have too much hum in AC-heated systems.
low and allows the use of tubes that would other-
wise have too much hum in AC-heated systems.
Delayed high-voltage with delayed muting relay
The high voltage plate supply is applied to the
tubes after a delay of about 40 seconds. This gives
the tubes ample chance to warm-up without the
chance of “cathode stripping” (degradation of the
cathode by bombardment by positive ions before it
tubes after a delay of about 40 seconds. This gives
the tubes ample chance to warm-up without the
chance of “cathode stripping” (degradation of the
cathode by bombardment by positive ions before it
is hot enough to build-up a protective space charge
around the cathode.) This helps extend tube life. A
muting relay shorts the audio outputs until about
4 seconds after the high voltage is applied. This
allows start-up transients to die away.
around the cathode.) This helps extend tube life. A
muting relay shorts the audio outputs until about
4 seconds after the high voltage is applied. This
allows start-up transients to die away.
No troublesome integrated circuits
All time delay and regulation circuits use time-
proven, simple discrete semiconductor devices.
proven, simple discrete semiconductor devices.
Critical audio circuits point-to-point wired with
military-style terminal boards
Conventional fiber-glass PC boards are used for
the power supply and for the rear panel jacks and
switching. All critical circuits in the audio path use
point-to-point wiring on military-style terminal
boards using silver-plated turrets. This technique
minimizes the sonic effects of PC boards and allows
easy component replacement.
Conventional fiber-glass PC boards are used for
the power supply and for the rear panel jacks and
switching. All critical circuits in the audio path use
point-to-point wiring on military-style terminal
boards using silver-plated turrets. This technique
minimizes the sonic effects of PC boards and allows
easy component replacement.
High-quality, high temperature capacitors
All electrolytic capacitors are high-quality 105°C-
rated Panasonic® types for best reliability. All film
capacitors in the signal path are either polypropyl-
ene or silvered-mica types.
rated Panasonic® types for best reliability. All film
capacitors in the signal path are either polypropyl-
ene or silvered-mica types.
High-speed rectifiers and electrostatically-shielded
power transformer
Power supply noise is kept to a minimum by the use
of a custom power transformer with electrostatic
shielding between the primary and secondaries.
High speed rectifiers are used for both the plate and
heater supplies.
Power supply noise is kept to a minimum by the use
of a custom power transformer with electrostatic
shielding between the primary and secondaries.
High speed rectifiers are used for both the plate and
heater supplies.
Available mains voltages (wired at factory): 100V,
110V, 120V, 220V, 230V, 240V, 50 or 60Hz
Virtually all the power systems of the world can be
accommodated by the LA-1 transformer connec-
tions. These are set at the factory or can be re-wired
by a qualified technician.
Virtually all the power systems of the world can be
accommodated by the LA-1 transformer connec-
tions. These are set at the factory or can be re-wired
by a qualified technician.
www.aydn.com
Tel: +1 818 216-7882
email: info@aydn.com
Tel: +1 818 216-7882
email: info@aydn.com
AYDN Vacuum Tube Audio
679 Easy Street, Unit E
Simi Valley, California 93065 USA
679 Easy Street, Unit E
Simi Valley, California 93065 USA
Artemis Labs products
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rev 1.0 11/04