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"Myths"
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<blockquote data-quote="jlaine" data-source="post: 63638" data-attributes="member: 542392"><p>Home or audio amp? Or did you mean home or car?</p><p></p><p>It's home audio, nothing off the wall, fairly standard TO-3 case fet's, unregulated power supply, 75wpc design. 35VDC power rails, benchmarked at 90wpc @ .01% thd @ 60hz. 24000uF supply bank, very low ripple design, 20~22K response, 4 ohm stereo, non-bridgeable.</p><p></p><p>Man, that's been collecting dust for a while, some of my specs may be off from my memory being sketchy... I built it... 7 years ago... I could bench it again in a few days if you like, it's around my house somewhere.</p><p></p><p>Back on track...</p><p></p><p>P = V^2/R is used to bench test amplifiers, always is.</p><p></p><p>Few reasons...</p><p></p><p>1. No need to be in the circuit path. (parallel connection, not series)</p><p></p><p>2. More accurate, clampmeters are too sensitive at such marginal loads.</p><p></p><p>Other thing disputed:</p><p></p><p>Gains are always voltage controls, the current is based on the load. The gains will try and set the voltage at the level they were designed to, reguardless of the load presented. That is why they are called such, and why they are seen as marked out in dBV.</p><p></p><p>The amplifier tries to maintain VOLTAGE levels at varying impedances, not current levels. That is why it is done the way it is. (until we get into dual power rails, like soundstream rubicon designs and JL's RISC setup)</p><p></p><p>If you drop the load, and leave the gain identical, the amplifier is going to TRY and present the same amount of voltage, with the higher current. Sometimes it can pull it off, other times something goes goofy.... //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif</p></blockquote><p></p>
[QUOTE="jlaine, post: 63638, member: 542392"] Home or audio amp? Or did you mean home or car? It's home audio, nothing off the wall, fairly standard TO-3 case fet's, unregulated power supply, 75wpc design. 35VDC power rails, benchmarked at 90wpc @ .01% thd @ 60hz. 24000uF supply bank, very low ripple design, 20~22K response, 4 ohm stereo, non-bridgeable. Man, that's been collecting dust for a while, some of my specs may be off from my memory being sketchy... I built it... 7 years ago... I could bench it again in a few days if you like, it's around my house somewhere. Back on track... P = V^2/R is used to bench test amplifiers, always is. Few reasons... 1. No need to be in the circuit path. (parallel connection, not series) 2. More accurate, clampmeters are too sensitive at such marginal loads. Other thing disputed: Gains are always voltage controls, the current is based on the load. The gains will try and set the voltage at the level they were designed to, reguardless of the load presented. That is why they are called such, and why they are seen as marked out in dBV. The amplifier tries to maintain VOLTAGE levels at varying impedances, not current levels. That is why it is done the way it is. (until we get into dual power rails, like soundstream rubicon designs and JL's RISC setup) If you drop the load, and leave the gain identical, the amplifier is going to TRY and present the same amount of voltage, with the higher current. Sometimes it can pull it off, other times something goes goofy.... [IMG]//content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif[/IMG] [/QUOTE]
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