Puresound L10 Valve Preamplifier
The L10 is a valve preamplifier that brings much of the design approach of the flagship L300 into a more accessible model. It combines transformer coupling with a fully valve-based power supply to deliver a stable, low-noise and musically engaging performance.
Key features:
• valve preamplifier
• single-ended triode gain stage
• output transformer coupled design
• 4 x line inputs
• record in / record out loop
• 2 x RCA outputs
• motorised film potentiometer volume control
• remote control operation
Design and performance:
The L10 uses a single-ended triode amplification stage loaded by a custom wideband output transformer. This transformer steps down the signal to provide a low impedance output, allowing strong compatibility with a wide range of power amplifiers and interconnect lengths.
Source selection is handled by a high-quality switch positioned close to the input sockets, minimising signal path length before the volume control and amplification stage.
Materials and construction:
• custom-wound wideband output transformers
• motorised film-type potentiometer
• valve rectified power supply
• twin choke filtered LCLC power stage
• fully regulated filament supplies
The power supply is a key part of the design, using a valve rectifier and twin choke smoothing (LCLC) to provide a stable, low-noise voltage rail. This ensures consistent performance regardless of musical demand.
Sound characteristics:
• stable and controlled presentation
• strong dynamics without strain
• low noise floor with good clarity
• consistent performance across varying loads
• smooth, natural tonal balance
The transformer-coupled output helps maintain signal integrity while ensuring the preamp remains unaffected by cable length or amplifier input impedance.
Build and usability:
The L10 includes a dedicated record loop for integration into more complex systems, along with remote-controlled volume for convenience. Its layout prioritises short signal paths and practical usability.
Specifications:
• inputs: 4 x RCA
• outputs: 2 x RCA
• additional: record in / record out loop
• volume control: motorised film potentiometer (remote)
• circuit: single-ended triode with transformer output
Note:
The L10 is designed to offer a balance of traditional valve sound and modern usability, with particular emphasis on power supply stability and output drive capability.
