Line vacuum tube pre-amplifier
The PL-L is a Pure Class A vacuum tube line pre-amplifier, based on the proven design concepts of the world-renowned PL-P and offering 4 inputs. It differs from the PL-P in that it does not have a phono front-end stage and is not equipped with the internal battery for total power isolation.
The PL-L has a remote control allowing the different functions to be remotely selected and optimal balancing of the output transformers. The jewel-like machined anodized aluminum case features input source selection, balance and volume controls, as well as a precision modulometer for system level matching. The PL-L is designed to provide the highest quality audio performance in an ultra-high-resolution audio system.
Quality in every detail
The PL-L uses three high-grade vacuum tubes and Nagra-made transformers to provide a variety of operating options. Each vacuum tube used in the PL-L has been burned-in for 12 hours and thoroughly tested to ensure the highest level of performance. The PL-L is designed in a pure audiophile approach of both quality and simplicity in signal’s path.
The power supply is always a key issue in the quality of a pre-amplifier. The external power supply is designed to deliver quiet and stable performance essential for the highest quality audio system. It is completely isolated from AC line noise.
The PL-L provides four line inputs that include one XLR unbalanced (asymmetrical) and three RCA (CINCH) single-ended. The audio output is automatically muted when switching between sources.
The outputs of the PL-L are directly coupled to the output vacuum tubes, specifically to ensure the highest audio performance. The level of the output connectors can be modified to match the specific level of the amplifier. Thanks to its specific design, the PL-L can drive loads as low as 600 Ω.
A switch is provided to select either: Output 1, two unbalanced sets of RCA stereo connectors to allow bi-amp setups or to connect to both amplifiers and a recorder. Output 2, unbalanced (assymetrical) XLR connectors; as an option custom-designed Nagra-made transformers are also available for floating output. For more information regarding balanced connections, please refer to our FAQs.
Relaxed listening convenience
The remote control will allow selection between the different input sources and adjustment of balance and output level. Direct motors are implemented for driving volume and balance control potentiometers. This means, the remote control does not degrade the sound quality; the audio signal path remains unchanged. This is the most elegant way to control the volume and balance in an analog product (as in the MPA-RCMI integrated power amplifier). The remote control unit can also be used to control the DAC and the MPA-RCMI.
Tradition – Level matching through the Nagra modulometer
A highly precise, Nagra-made modulometer, identical to the legendary NAGRA IV-S, provides a multitude of functions through two coaxial, internal pointers representing the left and right channels. The Nagra modulometer is a true measurement device that allows precision over a large scale. The modulometer can be used to adjust the volume and balance potentiometers for:
- Reaching a proper balance between left and right channels ;
- Compensating the level differences between various recordings ;
- Controlling the power supply DC input level ;
- Controlling the output level of the amplifier (if correctly set).
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