Allnic AudioL-9000 OTL/OCLnewAllnic Audio L-9000 Line Stage PreamplifierI have a black Allnic L-9000 in stock ready to ship, contact me for details, price and possible trades. ALSO, a SILVER demo model that’s used and super priced !Contact me for price and discuss trad...18000.00

Allnic Audio L-9000 Line Stage Preamplifier

Listing ID: lisa3feg Classified 
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albertporter 

member since September 1999

Porterhouse Audio.  Verified Dealer

Last 12 months
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NEW
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Ships fromDallas, TX, 75231
Ships toWorldwide
Package dimensionsunspecified
Shipping carriersUPS or FedEx
Shipping costSpecified after purchase
AverageResearch Pricing

I have a black Allnic L-9000 in stock ready to ship, contact me for details, price and possible trades.

ALSO, a SILVER demo model that’s used and super priced !

Contact me for price and discuss trades if applicable.

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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