Amplifiers

The amplification stages in the Riviera Audio Labs APL1 operate in pure class A. Riviera Audio Labs APL1 uses a more powerful power transformer and a capacitor block of the power supply filter. The preamplifier also uses an input transformer circuit for both types of inputs.

The Croatian company Limestone has introduced the Limestone PP1 mono power amplifier, which uses KT88 tubes. The model is housed in an “armor-piercing” case made of 1.5 mm stainless steel. Kerrock decorative panels add exquisite touches and allow the devices to fit into any interior.

The manufacturer states that this model was developed as a linear preamplifier that combines the rich and mature sound of the G-70 with the power of the flagship G-1000.

The output stage of the NAT Transmitter Evo amplifier can operate in two modes – high power up to 80 W or low power up to a moderate 40 W. Both modes use a directly heated triode in a single-ended connection. With a power of 80 W in a single-ended configuration, it is possible to choose almost any speaker system as a partner - NAT Transmitter EVO is capable of working with speaker systems with an impedance of 2 to 16 Ohms.

The PIVETTA Silente Nanofluid power amplifier is based on a cylinder made of the famous Murano glass from Venice. Each component of the amplifier is immersed in a stabilizing liquid Nanofluid, the composition of which the manufacturer keeps secret. This solution protects against electrical interference and thermal fluctuations, which minimizes the effects of thermal drift and dampens microvibrations. A massive waterproof aluminum frame provides additional stability, reducing even the slightest vibrations.

The TEAC HA-507 model is made as a fully balanced scheme with a “dual mono” configuration and is capable of providing an output power of up to 6.7 Wt per channel when driving headphones with a nominal impedance of 32 ohms with a balanced connection, which makes it suitable for working with a wide range of headphones.

Devialet has developed an ADH-class amplification circuit (low-power class A supported by a voltage follower and containing deep negative feedback) specifically for the amplifier line.

Devialet Astra rethinks the concept of High Fidelity, offering 2 x 300 W (4Ω speakers) of output power with zero distortion, zero saturation.

The QUAD 303 stereo Class A/B power amplifier also uses proprietary “triples” output stages.

QUAD has announced the revival of its legendary QUAD 33 preamplifier.

According to the manufacturer, the Unison Research Triode 25 Black Edition has an optimized amplifier circuit - both in the signal path and in the power supply.

hARt Lab Tune Three, stereo power amplifier, based on Dual Mono configuration.

hARt Lab Tune Two is a new High End preamplifier with on-board digital-to analog converter, streamer, phonostage and headphones output.

Marantz LINK 10n is a reference-class preamplifier with a built-in network audio player, developed using advanced Marantz technologies that made MODEL 10 and SACD 10

Mephisto Stereo, one of the top models in the Gryphon's product line, reflects all the company's developments over its long history.