Class-A amplifiers have a well-deserved reputation for being power guzzlers that run hot enough to burn fingers. They're inherently inefficient because their output devices conduct full current at all times, and much of that current is dissipated as heat—requiring, in the case of class-A solid-state amplifiers, massive heatsinks. This is why class-A amps tend to produce relatively low power, and tend to be heavy and expensive to buy and run. And these days, energy inefficiency is out of fashion.

Perhaps because I grew up in post-WWII England, with austerity and food rationing the norm, I learned at an early age the value of frugality. It was a financial stretch for me to buy, in the late 1960s, my first real audio system: Garrard SP25 turntable with Audio-Technica cartridge, Kenwood integrated amplifier, Wharfedale Super Linton speakers. Even when I could afford to upgrade the system, other than replacing the Garrard with a Thorens TD 150 and the Audio-Technica with a Shure, I went the DIY route. Back then, in the early '70s, I assumed that the advent of op-amp chips like the Fairchild Semiconductor µA741 would make it possible for me to design and make, for example, a good-sounding preamplifier for a lot less than it cost to buy one from an established manufacturer. That assumption turned out to be wrong, of course, but frugality was, by then, a habit: too ingrained for me to shake entirely.

Audiophiles who need something to do during RMAF should check out Soundings Fine Audio and Video. Situated just two blocks from the Marriott DTC at 8101 E. Belleview Ave X-1, Denver, CO 80236, the Denver retailer is having a party at 6pm Friday, October 2, and all showgoers are invited. They will be serving hors d'oeuvres, drinks, and adult beverages.

With 147 exhibitor rooms, 60 active CanJam exhibitor booths, 40 lobby exhibitor spaces, and 380 exhibitor companies from 23 countries, Denver's annual Rocky Mountain Audio Fest ranks as the second-largest consumer audio show in North America. The three-day show opens to the public on Friday, October 2 at noon in its familiar Denver Marriott Tech Center location.