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Audio and Video Talk
Valves / Vacuum Tubes
Quad II and 202 has arrived
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<blockquote data-quote="Ampdog" data-source="post: 742466" data-attributes="member: 144"><p>I agree. There is a total overrated fixation with the "sound" of coupling caps, having little to do with reality. Particularly coupling caps ... never mind, not desiring to start another heated discussion this time of year. Also, 630V caps are so common and cheap that I use all at that voltage apart from what is actually experienced.</p><p></p><p>One other matter sometimes befuddling Quad II owners: When testing coupling caps by measuring the KT66 grid-1 voltages, keep in mind that these are not zero. They sit at a few 100mV positive as a result of the R4-R10 EF86 bias sitting there. Also then the voltages on the EF86 electrodes cannot be the same for both valves. But these will vary far more because of almost unacceptable spread in modern valve characteristics, even same brand (sigh). (Not to expound further on that sad topic at Christmas time ....)</p></blockquote><p></p>
[QUOTE="Ampdog, post: 742466, member: 144"] I agree. There is a total overrated fixation with the "sound" of coupling caps, having little to do with reality. Particularly coupling caps ... never mind, not desiring to start another heated discussion this time of year. Also, 630V caps are so common and cheap that I use all at that voltage apart from what is actually experienced. One other matter sometimes befuddling Quad II owners: When testing coupling caps by measuring the KT66 grid-1 voltages, keep in mind that these are not zero. They sit at a few 100mV positive as a result of the R4-R10 EF86 bias sitting there. Also then the voltages on the EF86 electrodes cannot be the same for both valves. But these will vary far more because of almost unacceptable spread in modern valve characteristics, even same brand (sigh). (Not to expound further on that sad topic at Christmas time ....) [/QUOTE]
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Audio and Video Talk
Valves / Vacuum Tubes
Quad II and 202 has arrived
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