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Audio and Video Talk
Valves / Vacuum Tubes
Sansui AU111 Valve Amplifier
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<blockquote data-quote="Ampdog" data-source="post: 122338" data-attributes="member: 144"><p>Ya-e-e-e-e-h ... One must be careful there. With a s.diode rectifier power supply most of the coupling caps will have the full unloaded h.t. over them for about 15 sec, until the power valves have warmed up, and that will be >400V. I am not sure what the safety factor is with poly-caps these days, but that is not safe. For a few Rand difference in cost I regularly use 630V caps only; small enough in size etc.</p></blockquote><p></p>
[QUOTE="Ampdog, post: 122338, member: 144"] Ya-e-e-e-e-h ... One must be careful there. With a s.diode rectifier power supply most of the coupling caps will have the full unloaded h.t. over them for about 15 sec, until the power valves have warmed up, and that will be >400V. I am not sure what the safety factor is with poly-caps these days, but that is not safe. For a few Rand difference in cost I regularly use 630V caps only; small enough in size etc. [/QUOTE]
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Audio and Video Talk
Valves / Vacuum Tubes
Sansui AU111 Valve Amplifier
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