View Full Version : SW1X LPU II Phono Pre-Amplifier released!

02-06-2017, 17:01
SW1X Audio Design™ LPU II Performance Level 2 MM Valve Phono Pre-Amplifier

The SW1X LPU II is characterised by powerful dynamic sound with natural, life like presentation- a combination that we look after in analogue playback.

Acoustic instruments and human voices sound completely naturally, lacking of any mechanical signature.

The classic RIAA circuit is made of specially selected materials & components out of production and only available in limited quantities.

The phono pre-amplfier is based on a classic circuit design used to master vinyl recordings and master tapes.

It is a two gain stage design consisting of 2 (one for each channel) pentode valves on the input stage and two power pentodes (used in power amps) in triode mode on the output.

The input stage utilises lush sounding EF80/EF86 valves in pentode mode, which drive passive RIAA equalization network (without series resistors), which is amplified by the EL84 power pentode, triode connected on the output stage. The low output impedance EL84 power output stage is choke loaded in order to deliver supreme dynamics and punchy bass. Choke loaded anode of the EL84 valve make any conventional resistor loaded sound lame and dull in comparison.

The power supply is CLCLC, EZ80 double diode valve rectified and 2 x chokes filtered

more info can be found here: http://sw1xad.co.uk/product/sw1x-lpu-ii-phono-pre-amplifier/

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