Ming Da is company based in China that exports tube preamplifiers, power amplifiers, and integrated amplifiers in various price ranges, including some very high end models. They sell direct, through Pacific Valve, rather than through dealers, so you really get a good bang for the buck. In this review, my first of a Pacific Valve product, is on the MD-75, which is a stereo integrated amplifier. It has a detached power supply for low noise and interference, a remote for the motorized volume control, and you can switch between triode mode (40 watts/channel output) and ultra-linear mode (75 watts/channel output). You can "tube roll" if you wish, and the review unit came with optional Black Treasure CV-181 driver tubes and Black Treasure KT88 output tubes.

One very nice feature of this product is that, when you turn it on, the volume control rotates to the lowest volume setting, so you don't accidentally start playing music at a volume that might startle you.

This second part of the HK 990 review examines the signal flows in the HK 990 dual-domain integrated amplifier. This analysis is relevant to all units, including modem AVRs, with a DSP signal processing unit in the main signal path. The signal flow is more transparent in this stereo unit than a 7.1 multichannel unit; so, if you are interested in AVR, please stay tuned in to Part II.

The HK 990 is a truly unique stereo component. It is a dual domain device capable of accepting analog or digital inputs, converting domains as required, and sending the results to the speaker.

The CEDIA Expo isn't really a show for audiophiles. Most of the setups are geared towards in-wall speakers, projectors, and other various forms of home automation, but there are always a few vendors there that have some nice demonstrations. This year, one of my favorite demonstrations came from Paradigm, who had a complete home theater built with their Signature S2, Version 3s as the front speakers.

Most likely recognized in today's market as a purveyor of home theater receivers, desktop/PC speakers, iPod docks, and factory-installed automotive sound systems, Harman Kardon is a name that is also well-recognized in traditional 2-channel audio. While the history of the company is quite interesting (see the "about us" link on the company's webpage), one thing has remained constant at Harman Kardon over the years: they produce an aesthetically pleasing product that delivers the high-sound quality sought after by the brand's customers. Here, we review their 990 Integrated Amplifier and HD 990 CD Player.

What's in a Naim? For those not overly familiar with the brand (myself included), that has usually meant DIN connectors, the ubiquitous black casework, green lit circlet buttons and a reputation for an emphasis to PRat. This reputation for Pace Rhythm and Timing and a focus on hand built craftsmanship put Naim in a unique place amongst audio components.

Manley Labs designs and manufactures tube components. With the Stingray iTube, you can now plug your iPod directly into a dock on an integrated tube amplifier.The iTube can be switched between triode mode and ultralinear mode, giving you a choice in how much output the amplifier will deliver. It comes with a very unique remote control that you would only expect from Manley.