Puresound L300 Pre-Amplifier

L300 has 5 inputs and twin outputs (2 pairs single ended and 2 pairs balanced via XLR). The circuit uses output transformers and a sophisticated full valve rectified, choke smoothed, regulated power supply including a 300B triode as the series element.

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Description

These are volume controls where attenuation is achieved through the use of tapped transformer windings.

On the face of it either of these might appear to offer the purest approach. However, it’s not so simple. Resistive attenuators are generally of quite a high impedance so as not to load the source driving them but in turn confer little drive capability themselves. In some circumstances they can sound quite transparent but it’s a commonly experienced subjective impression, that such attenuators leave the music with a lack of purpose and grip. Long connecting cables may also blunt the high frequency response, a situation which may be worsened by using a following amplifier with low input impedance.

In the L300, source selection is via a high quality switch located near to the input sockets. The chosen source is routed to a high quality film potentiometer and from there on to the audio circuit. This consists of 2 directly coupled triode stages, the second loaded by an output transformer which steps down the amplified signal allowing it to be coupled to the power amplifier at a manageable level and via a low impedance output. The output stage of the L300 is impervious to long interconnecting cables or lower impedance power amplifier input stages. The use of output transformers also allows the option of a true balanced output configuration if desired.

The L300 preserves the verve and energy in recordings that almost all pre-amplifiers and passive volume controls otherwise lose. It does this without sacrificing transparency or introducing euphonic colouration to the sound.

Puresound L300 Pre-amplifier specifications

  • Freq Response…………………………………….-1 dB 7Hz-50KHz
  • Signal to noise:……………………………………………………>90dB
  • Input sensitivity:…………………………….222mV to full output
  • Input connections:…………………………….5 pairs line level in
  • Output connections:……..2 Rca pairs and 2 balanced pairs
  • Valves: ..12AU7 x 6, 6922 x 1, 300B x 1, 5AR4 x 1, VR150 x 1
  • Power consumption………………………………………….150Watts
  • Line in impedance:………………………………………..100K Ohms
  • Dimensions………………….W480 mm x D420 mm x H180 mm
  • Weight……………………………………………………………………..20Kg

Price £5999.95

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