The Signature Edition features a more versatile and better-sounding circuit designed to use the ECF802/6JW8 in place of 6AN8a for the front end, with new options to use E80CC/6211 (as well as 12BH7, ECC82/12au7 types) for the driver tube positions. 300B tubes of course, stay the same. Twin internal independent circuits (dual mono) for total channel isolation, and a significantly reduced noise floor. Gain is reduced from 18 dB to 12 dB to allow for more range on the Allnic exclusive 61-Step Constant Impedance Attenuator. These upgrades are beneficial for digital audio, while preserving the low noise floor necessary for lower output phono stages that require more gain from the line stage.
Description:
L-10000 Preamplifier is Direct Coupled OTL/OCL Tube Preamplifier.
OTL/OCL means “Output Transformer Less” and “Output Capacitor Less”.
In OTL/OCL amplifier, there is no coupling device from preamp to power, that is, final output tubes are directly connected to the power amplifier. We need Output Capacitor or Output Transformer for separating AC music signal from DC operating potential, if not, the latter will destroy power amplifier or the loudspeakers. But these two coupling devices are kinds of obstacles on signal transmitting which impart their own charactor (aka color), increase distortion and consume small signal under the physical efficiency theory. In addition, they put a limitation on signal dynamics, so OTL/OCL has been considered the best solution on amplifiers.
- When we can remove these two coupling devices from the signal path we attain the best result.
- No coloration added to musical signal.
- Extremely detailed expression, natural harmonics and subtle musical decay.
- Lowest distortion due to the absence of coupling parts.
- The widest musical dynamics.
- Some circuit experts could worry about DC potential in the music signal. Allnic uses “the floating power supply circuit” which does not make any DC potential.
OTL/OCL circuit is basically SEPP, “Single Ended Push Pull”, so we need a ” cancellation circuit” which adjusts the balance of signal between upper and lower power output tubes’ input grid.
Newly developed 61 STEP CONSTANT IMPEDANCE BRIDGED TYPE ATTENUATOR, a world premiere, is installed inside, which contributes to L-10000’s different dimensional sound.
Allnic uses the most sophisticated "Active Balanced Positive and Negative Feedback Circuit", in which the penthode of 6AN8 controls perfectly the current with extremely low distortion and with the highest speed, creating a dynamic response unlike any other linestage commercially manufactured to date.