max@eros.uucp (Max Hauser) (07/23/88)
In article <88Jul21.105530edt.493@neat.ai.toronto.edu>, Louis Lin asks: | I often heard about people talking about the 'classes' of amplifier, ie | class A, class B, class AB, etc. ... Can some nice | audiophile outthere tell me what they are and how they work? Thx. Class A is the best, class B is mediocre, and class AB is in-between. This replaced the old prime/choice/good/commercial/utility grading system in 1984 at the behest of the RIAA (and the acquiescence of the USDA). (The preceding is facetious, but is MUCH more accurate than the run-of-the- net response to be expected from the "authoritative" source of rec.audio). In article <5347@cg-atla.UUCP>, (Erik Hjortshoj) deposes: | I am ... interested in building CAR amplifiers. | | The references given in this group are helpfull but I whant to know | how much harder it is to make car amps. Are they safe enough to | stick in the car? Is the 12V (14V) power source a problem. ... You might ask on sci.electronics, where they just spent weeks discussing how much power can be gotten through a speaker at 12 volts (not as good as the endless discussion about skin effect on rec.audio last year -- almost pure, in the sense of devoid of fact -- but approaching it). Or, you might subscribe to the high-audio mailing list, which (at least for the first couple hundred postings, before I unsubscribed) took for granted that all repeat all high-end audio equipment was built with tubes (valves), and (or so it appeared) was owned by university students; but that source would probably immediately advise an electromechanical alternator to obtain the necessary 300V B+, and discussion would ensue from there. These may plausibly be unsafe to stick in a car. But seriously: rec.audio is not the place to get good advice on things of this kind -- though it IS a place to get plenty of advice ... Max Hauser / max@eros.berkeley.edu / ...{!decvax}!ucbvax!eros!max "The thermonuclear ignition, if properly coupled to the bulk lithium deuteride, will propagate as a wave front with incredible velocity, consuming the entire mass in some tens of nanoseconds. It is likely that the complete detonation will have begun *and ended* before the outer casing has yet ruptured." -- shock-wave physicist, Deutsche Forschungs- und Versuchsanstalt fuer Luft- und Raumfahrt e. V. (DFVLR)