Puresound L5 valve Preamplifier

Puresound L5 Valve Preamplifier

The L5 is a valve-based preamplifier designed to deliver dynamic, engaging performance while maintaining low noise and strong signal integrity. Built around a simple, direct-coupled circuit, it focuses on preserving energy and drive in the music.

Key features:

• valve preamplifier
• 5670 double triode valves
• direct-coupled gain stage with output buffer
• 4 x line inputs
• 2 x line outputs
• ALPS motorised volume control
• dual-rail power supply (separate per channel)

Design and performance:

The L5 uses a pair of 5670 double triodes in a gain stage that is directly coupled to a low impedance output buffer. This design avoids unnecessary components in the signal path, helping maintain clarity and drive.

Unlike passive preamps, the L5 provides active gain and buffering, allowing it to preserve the energy and dynamics of recordings rather than softening or flattening the presentation.

Materials and construction:

• 5670 double triode valves
• ALPS motorised potentiometer
• independently filtered high-voltage rails (left/right)
• smoothed filament power supply

The power supply is carefully designed, with separate HT rails for each channel to improve channel separation, while smoothed filament supplies reduce noise and hum.

Sound characteristics:

• strong sense of dynamics and energy
• clear, open presentation
• stable and controlled signal delivery
• low noise with good channel separation

The L5 is particularly effective at maintaining the immediacy of recordings, avoiding the loss of impact sometimes associated with passive designs.

Build and usability:

The inclusion of a motorised ALPS volume control allows for smooth adjustment and remote operation, while multiple inputs and outputs provide flexibility within a system.

Specifications:

• valves: 2 x 5670 double triodes
• inputs: 4 x RCA
• outputs: 2 x RCA
• volume control: ALPS motorised potentiometer
• circuit: direct-coupled gain stage with buffer

Note:

The L5 is designed to partner a wide range of power amplifiers, offering both flexibility and a lively, engaging sound character within a high-quality valve-based design.