Allnic AudioL-9000 OTL/OCLnewAllnic Audio L-9000 Line Stage PreamplifierI am Allnic Audio USA, official importer and distributor. Contact me direct at [email protected] and visit me at https://www.allnicaudiousa.com/ and https://www.porterhouseaudio.com/The L-900...18000.00

Allnic Audio L-9000 Line Stage Preamplifier

Listing ID: lisa3feg Classified 
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New Retail Price: $18,000.00

$18,000.00

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Ships fromDallas, TX, 75231
Ships toWorldwide
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I am Allnic Audio USA, official importer and distributor.  Contact me direct at [email protected] and visit me at https://www.allnicaudiousa.com/ and https://www.porterhouseaudio.com/

The L-9000 is a Direct Coupled OTL/OCL Tube Preamplifier. OTL/OCL
means “Output Transformer Less” and “Output Capacitor Less”. In an
OTL/OCL preamplifier, there is no coupling device between the
preamplifier and the power amplifier , that is, the preamplifier’s final
output tubes are directly connected to the power amplifier. Normally,
an Output Capacitor or Output Transformer for separating AC music signal
from the DC operating potential; if this is not done, the latter will destroy the power amplifier or loud speakers.


In common circuits, output capacitors or output transformers are
required to separate the AC music signal from the DC operating
potential. If this is not done, the latter will destroy the power
amplifier, the loudspeakers, or both. However, these two coupling
devices also introduce their own influences on the transmission of the
musical signal, adding their own character (colouration), increasing
distortion, and consuming small signals, all as predicted by physical
efficiency theory. In addition, they also limit signal dynamics. For
these reasons, the elimination of output transformers and capacitors has
been considered the best solution for the design of the most accurate
amplifiers. Removal of these two coupling devices from the signal path
achieves the best results possible:



  • No coloration of the musical signal

  • Extremely detailed expression, natural harmonics and subtle musical decay

  • The lowest possible distortion

  • The widest musical dynamics


In the L-9000, there is no coupling device between the preamplifier
and the power amplifier; that is, the final gain/output tubes are
directly connected to the power amplifier. Thus, the benefits listed
above are fully present in the Allnic L-9000 preamplifier.


Some circuit experts might be concerned about DC potential in the
music signal in an OTL/OCL design. However, the chance of this problem
occurring can be 100% reliably eliminated by doing away with the
potential for DC in the signal path. To do this, Allnic uses a “floating
power supply circuit”, a design which deals with the theoretical issue
by simply not creating any DC potential in the first place.


The L-9000 OTL/OCL circuit is basically SEPP, “Single-Ended,
Push-Pull”, so a “cancellation circuit” is required to adjust the
balance of signal between the upper and lower power output tubes’ input
grids. Allnic uses an extremely sophisticated “Active Balanced Positive
and Negative Feedback Circuit”, in which the 6AN8 pentode perfectly
controls the circuit’s operation with extremely low distortion and
incredible speed.

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