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INTRODUCING THE L-7000 PREAMPLIFIER
The L-3000 is Allnic Audio's best line stage
preamplifier. Like all Allnic Audio products, it
uses Permalloy (Iron and nickel alloy) for its
transformer cores. Allnic is grateful to Mr.
G.W. Elmen of Western Electric for inventing
Permalloy for transformer core use, and in so
doing, providing an enormous service to
recorded music listeners everywhere.
The L-7000 has the following features:
•
Single gain stage – A single gain stage
circuit uses only one tube for amplification
("gain"). This reproduces a purer, more
detailed,
more
dynamic sound than multi gain stages.
•
Line output transformer coupling – The
L-7000 is
"transformer coupled". In tube amp
circuitry, there are two coupling methods;
one is capacitor coupling and the other is
transformer coupling. Capacitor coupling
is the traditional, low cost method. It is
somewhat stable but transfers only
voltage, not wattage (i.e., not real energy).
With transformer coupling, about 90% of
real wattage is transferred (there is still a
transformer loss of about10% of wattage –
voltage is not affected).
Transformer coupling is superior to
capacitor coupling. However, all the
advantages
of
depend on the quality of the transformer
and on the choice of tubes. Allnic Audio
manufactures its own transformers and
uses what it views to be the best core
material,
Permalloy.
unprecedented, wide (16Hz ~ 75kHz,
-3db), low distortional, and ultraflexible
(up to 50kHz square wave response)
output transformer helps Allnic Audio to
spacious
and
more
transformer
coupling
Allnic
Audio's
realize the ideal transformer coupled
preamplifier. Of course, gain tubes are
also carefully selected for three critical
factors for function with the Permalloy
output transformers: high gm, low internal
resistance and high mu.
•
Constant and low output impedance –
One of the
benefits of transformer coupling is that it
facilitates constant low output impedance.
Low output impedance is critical to the
design of a good preamplifier. The L-7000
has a 150 ohm (150Ω) constant output
impedance at all frequencies. In capacitor
coupling (C-R coupling), a "cathode
follower circuit" is usually used to lower
output impedance. Unfortunately, this
method of lowering output impedance is
accompanied by high distortion and has
an "L" shaped output impedance curve.
Please compare the two graphs below,
especially for low frequency response.
•
No negative feedback design
•
Advanced
tube
regulation - For quieter and more dynamic
operation, the L-7000 has an ultra high
speed automatic voltage regulation circuit,
utilizing vacuum tubes. This also protects
the amplifying tubes from change in the
AC line supply and copes with any abrupt,
internal current demand.
•
New vacuum tube damping technology –
Allnic Audio's patented "Absorb GEL tube
damper" technology prevents harmful
vibrations from reaching the signal / gain
tubes
and,
microphonic noise propagation in the
tubes. The Allnic Audio Absorb Gel damper
technology effectively solves a problem
that plagues most tube amplification
systems. Provided other tube components
technology
voltage
therefore,
prevents