Least efficient operating range for typical Class AB amplifiers (which all of Manufacturers hated this one, because 33% power is right in the heart of the Mandated a warm-up or “preconditioning” period of an hour at 33% of rated power To be specified over what frequency bandwidth, at what THD distortion level,Īnd both channels had to be driven simultaneously. Had to state RMS/continuous power first, in the largest type, and that it had Ugh.ġ974, the FTC came in and mandated that audio amplifier power specifications Would advertise, “240-watt Amplifier!” for a 30-per-side unit. Adding together the two channels, manufacturers Had the wind at its back and you completely disregarded the distortion.Ī 30-watt/channel RMS stereo amplifier became a 60-watt/ch peak amp, whichīecame a 120-watt IPP amp. Probably muster about double its Peak power for the briefest of instants, if it Rationale was that an amplifier-if it had enough of a power supply-could The RMS was “Dynamic” or “Peak” or “Music” power-the rationale being that anĪmplifier could likely deliver about double its continuous rating on aĪ really bogus number called “IPP” or Instantaneous Peak Power. Number, it was always listed last, in small print, if listed at all. Was Continuous or RMS, but since this was the smallest, least-impressive In 1974, FTC stepped in to make stereo manufacturers clean up their deceptive wattage ratings. Ratings, companies would use all kinds of ratings. This is how it was done in those days: Let the buyerīack in the ’60 s and early ’70 s, before the FTC stepped in (1974) and madeĪll the stereo manufacturers clean up their deceptive advertised wattage Level of distortion? Over what bandwidth? Both channels driven simultaneously 90 watts how? Per channel? 45 per channel, so 90 watts total? At what Particular interest is this ad’s headline, boasting that it’s a “90-Watt” Units a somewhat shaky reputation for inferior sound and questionable quality. Germanium transistors had narrowerīandwidth, less gain and were not particularly reliable, giving the first transistor Early transistor models used germanium transistors, before manufacturers of mainstream electronics and the 500-T was Fisher’s firstĪll-transistor unit. In rough chronological order from oldest to newest, here are our picks for theġ0 (or so) most memorable receivers of the last 50 years: Two-Channelįisher 500-T receiver from around 1965-ish was a hugely important unit in theĮvolution of American hi-fi. ![]() We discuss the evolution from tubes to transistors, power ratings and the FTC, social, economic, and demographic changes that have occurred in America since the 1960’s and how this has impacted the receiver market. We cover everything from vintage two-channel to the more recent multi-channel surround AV receivers. The response to the Speakers article was any indication, this one should spark Write, and it’s even more fun to hear the reactions and read the comments. Round-up/historical articles like these are a heckuva lot of fun to Those comments are the very reason we do these articles, so we’d love to hear Neither article is about “the best,”īut we’re sure that won’t stop the flood of how-could-you-this-leave-off comments. ![]() Receivers, not necessarily the most influential. Most Influential Speakers of the Last 50 Years.” Instead, we cover the most “memorable” Article will have a slightly different angle than the recent article, “ The 10
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |