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Audio and Video Talk
Valves / Vacuum Tubes
KT120 & KT150
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<blockquote data-quote="Ampdog" data-source="post: 666147" data-attributes="member: 144"><p>The voltage rise sounds about right. The extra output can be obtained with higher voltage only, by using a different bias value and appropriate load impedance so that anode current remains the same.</p><p></p><p>But then, why 20% higher power? You would possibly have read that the smallest worthwhile audible difference in power output means a factor of two. ( Even the mains variation sometimes can give an available output variation of up to 25%.)</p><p></p><p></p><p></p><p></p><p>600W from two KT90's would be pushing it. A design can 'claim' what it wants; how is it achieved?</p><p>Best range of a tube: Not anything specifically; depends on the circuit design.</p><p></p><p>Looking at the valve data shown: I question the KT88 values. KT88 is very similar to 6550; I cannot see how the dissipation etc. could be higher. Many data sheets show 6550 figures to be slightly higher than KT88, so watch that one.</p></blockquote><p></p>
[QUOTE="Ampdog, post: 666147, member: 144"] The voltage rise sounds about right. The extra output can be obtained with higher voltage only, by using a different bias value and appropriate load impedance so that anode current remains the same. But then, why 20% higher power? You would possibly have read that the smallest worthwhile audible difference in power output means a factor of two. ( Even the mains variation sometimes can give an available output variation of up to 25%.) 600W from two KT90's would be pushing it. A design can 'claim' what it wants; how is it achieved? Best range of a tube: Not anything specifically; depends on the circuit design. Looking at the valve data shown: I question the KT88 values. KT88 is very similar to 6550; I cannot see how the dissipation etc. could be higher. Many data sheets show 6550 figures to be slightly higher than KT88, so watch that one. [/QUOTE]
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Audio and Video Talk
Valves / Vacuum Tubes
KT120 & KT150
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