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Audio and Video Talk
Vinyl
Impedance Matching ???
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<blockquote data-quote="handsome" data-source="post: 72998" data-attributes="member: 772"><p>using 4 ohm speakers on the 8 ohm taps will present a higher resistance or load to the tubes than the design intended, this <em>usually</em> lowers power and distortion as most valve amps are designed with a load that will maximise power and minimise distortion going higher than this tends to lower both power and distortion as said as the power/distortion versus load curve is usually a sort of inverted 'U'. also speakers are not constant loads and the 8 or 4 ohm ratings represents perhaps an average across the frequency range. best advice is to use the taps that sound best to you - i doubt any damage can occur from this type of mismatch. however <em>don't</em> change the taps whilst the amp is playing music you can blow an output transformer doing that...in fact to be safe only change when it is off.</p></blockquote><p></p>
[QUOTE="handsome, post: 72998, member: 772"] using 4 ohm speakers on the 8 ohm taps will present a higher resistance or load to the tubes than the design intended, this [i]usually[/i] lowers power and distortion as most valve amps are designed with a load that will maximise power and minimise distortion going higher than this tends to lower both power and distortion as said as the power/distortion versus load curve is usually a sort of inverted 'U'. also speakers are not constant loads and the 8 or 4 ohm ratings represents perhaps an average across the frequency range. best advice is to use the taps that sound best to you - i doubt any damage can occur from this type of mismatch. however [i]don't[/i] change the taps whilst the amp is playing music you can blow an output transformer doing that...in fact to be safe only change when it is off. [/QUOTE]
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Audio and Video Talk
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Impedance Matching ???
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