Rediscover music's soul with Lowther's PX4 Valve Amplifier. Hand-crafted in Great Britain, this masterpiece revives 1940s designs with modern precision, offering purity of signal and emotional depth in every note.
Lowther AMPLIFIER

The PX4 Valve Amp

A harmonious blend of heritage and innovation, delivering 10 watts of exquisite sound through legendary British PX4 valves.

LOWTHER PX4 VALVE AMPLIFIER

Harmony of Heritage and Innovation

Inspired by our revered designs from the 1940s and 1950s, this amplifier pays homage to the legendary British PX4 valve – a beacon of acoustic excellence that prioritises revelation over raw power.

At its heart are two pairs of Direct Heated Triode PX4 valves - chosen not for their power output, but for their unrivalled ability to reveal musical truth. Delivering 10 watts per channel of exquisite sound, this amplifier embodies our philosophy that true fidelity comes not from brute force, but from purity of signal reproduction.

Every element has been meticulously considered, from the custom-wound transformers crafted in Dorset to the point-to-point wiring that eschews printed circuits in favour of a construction method that enhances both reliability and sonic qualities. The chassis, precision-machined from aluminium and finished with a bespoke powder coating, completes an instrument that is as beautiful to behold as it is to experience.

When paired with Lowther's full-range drivers, the PX4 amplifier creates a synergy that must be experienced to be fully appreciated.

Lowther PX4 Black
Lowther PX4 Amp
Lowther PX4 AMP
Lowther Amplifier
Lowther RCA Cables
Lowther power cable

The PX4 Valve Amplifier

Handmade in Great Britain, available in Green and Black.

Lowther PX4 AMP

PX4 Green/Black

From £12,000*
Amplifier topology:
PX4 Class-A push-pull
Valves fitted:
4 × PX4 (output)
2 × 6SN7
2 × 6J5
1 × 5U4G/5AR4
Bias arrangement:
Automatic cathode bias
Rated output power:
10 W + 10 W into 6 Ω
Frequency response (-3 dB):
10 Hz – 45 kHz
Signal-to-noise ratio:
93 dB
Input:
Main In × 1
Input sensitivity/impedance:
1 V rms for rated power / 300 kΩ
Variable feedback range:
0 dB – 10 dB (user adjustable)
Speaker outputs:
6 Ω binding posts
Power consumption:
200 W (maximum)
Dimensions (W × D × H):
330 mm × 430 mm × 240 mm

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