Purity - handmade in the UK

Our 170 stereo power amplifier has been designed to deliver a refined, organic and natural soundstage, without being over analytical. With the 170 we wanted realism, with a sense of ‘being there’, not just for powering our Sibelius loudspeakers but for all makes and models.

The Pearl Acoustics 170, single ended, vacuum tube power amplifier, is a totally new ground-up bespoke design, the result of working together with some of the best minds in the business. The amplifier features an extremely short signal path, bespoke, custom designed output transformers and power supply circuitry.
Our design concept has been focused on sustainability by incorporating product longevity into every aspect of its design, without limiting its clean, engaging and holographic sound performance. Musical finesse with very fine details and superb dynamics have been combined into a piece of equipment that is designed to last ‘forever’.


Dual mono, single ended design

0dB global feedback (of any kind)

Ultra short signal path

No solid-state devices in the signal path

No followers or buffers in the signal path

High current and low impedance design

Minimal discrete wiring for optimum signal propagation

Logical sequenced soft-start power up for extended tube life

Power tube and electronic protection circuit system

Automatic self-regulating, cathode bias topology

Custom designed and made transformers

Chassis mounted valve sockets (for improved stability and lifespan)

EU and CE approval

Automotive paint finish

Hand made in the U.K.


Input sensitivity: 1Vrms for 18W into 8ohms

Output power: 18W of pure Class A into 8ohms

Distortion: 0.5% 2nd and 0.03% 3rd harmonic at 1W into 8ohms

Frequency response: 20Hz to 20kHz

Loudspeaker compatibility: Stable down to 2ohms

Damping factor: 6

Input impedance: 10Kohm

Power consumption: 250W in use & 0.9W (max) in standby

Gain: 21.6dB

Gross weight: 31kgs (unpacked)

Dimensions: 405mm x 235mm x 375mm (whd)