power amplifiers

PS Audio Stellar S300 Stereo Power Amplifier

The new PS Audio Stellar S300 stereo amplifier is a delightful surprise. At a list price of only $1,499, the sound of the Stellar S300 has characteristics of some of the best amplifiers available, at any price.

QUAD Platinum Stereo Amplifier

The QUAD Platinum Stereo amplifier is the latest in a very long line of hi fi products from QUAD of England. QUAD, which is an acronym for Quality Unit Amplifier Domestic, has been making components since 1953 and has received many awards for the sound quality of their products, including the world-renowned Quad ESL loudspeakers and Quad II vacuum tube power amplifier.

Quicksilver V4 Power Amplifiers

This is not an easy review to write. For several months, the Quicksilver V4 amplifiers have been the primary amplifiers in my ever-changing audio system. I have connected them to four different preamplifiers and four different speakers, and numerous cables and power conditioners. I have replaced the Graham 2.2 tonearm with a Phantom on my Kuzma Stabi Reference turntable.

Response Audio Bella EXtreme 100 Power Amplifiers

I’m speechless. Or wordless. I had quite a lot to say about the new Response Audio Bella EXtreme 100 mono tube amplifiers during the first 400 hours of use while the Teflon® capacitors and other parts were slowly breaking in. Let me tell you a little about the amps themselves, and in the mean time, I’ll try to think of something to say about the way they sound now.

Spread Spectrum Technologies Ampzilla 2000 Power Amplifier

Passion. Our hobby/interest/vocation is all about passion. There is a lot of passion in the high-end audio universe and James Bongiorno, the head of Spread Spectrum Technologies, has a consuming passion for his creations. He has been building and refining the Ampzilla amplifier concept since 1974 and holds a patent on the design. From his Web site:

Spread Spectrum Technologies Ampzilla 2000 Second Edition Power Amplifiers

When I reviewed the original Ampzilla 2000 monoblock power amplifers in February, 2009, I reported on a very good sounding, well made component that had just enough of its own character that it was highly recommended but not without reservations.

Spread Spectrum Technologies Thoebe II Preamplifier & Son of Ampzilla II Amplifier

Son of Ampzilla II

Spread Spectrum Technologies was founded by James Bongiorno, the legendary and colorful audio pioneer and engineer who was also directly involved with key designs at Marantz, SAE, SUMO Electric, and Great American Sounds (GAS). Several years ago, Mr.

Valvet E2 SE Stereo Power Amplifier

The new Valvet E2 SE single-ended Class A solid-state amplifier is a revelation. Coming to market about a year after my review of the Valvet E2, the SE version exceeds the E2's audible performance in every parameter. Please see the older review for context. The special edition SE version takes all the E2's excellent performance and offers improvements in every area.

Valvet E2 Stereo Power Amplifier

Valvet High-End Audio, of Bargteheide, which is near Hamburg in northern Germany, has been making high quality audio components since 1982. Owner and designer Knut Cornils has a goal for all of his components: “(T)he transmission of music free from artefact or manipulation, music that stimulates the senses! A simple but well-thought-out circuit, short signal paths and the best, reliable components”.

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