L-9000 OTL/OCL Line-stage Preamplifier

Key Features

Immerse yourself in the original recorded space. The L-9000 OTL/OCL (Output Transformer-Less/Output Capacitor-Less) is a triple gain stage, remote controlled, line-stage preamplifier, without transformers or capacitors in its single-ended signal path. It uses the 6080 double triode as its directly coupled output power tubes; i.e., there are no output transformers on the single-ended (unbalanced) RCA outputs, so the 6080s communicate the signal directly to the connected power amplifier or amplifiers, fully revealing the 6080s’ inherent accuracy and beauty.
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 colouration 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.

• Pure single-ended, Class A operation
• 61 STEP CONSTANT IMPEDANCE BRIDGED TYPE ATTENUATOR – A world’s “first of its kind” for Allnic Audio
• Minimal negative feedback
• For its balanced (XLR) outputs, permalloy transformers, like those used in Allnic’s transformer-coupled preamplifiers, are employed.
• As are all Allnic Audio products, the L-9000 OTL/OCL is fully RoHS (EU Reduction of Hazardous Substances regulation) compliant in construction and materials.