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Audio and Video Talk
Vinyl
SANSUI AU111 valve amplifier service
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<blockquote data-quote="Ampdog" data-source="post: 61699" data-attributes="member: 144"><p>F-D,</p><p></p><p>Yes, they have, but not because they leaked - they were perfect. But they were rated at 350VWK. At start-up, before the valve cathodes start emmitting, there is the full unloaded h.t. plus 6L6 bias voltage across them: 500V + 50V = 550VDC. (The amp uses Si-diodes instead of a valve rectifier, applying h.t. immediately upon turn-on.) Polyester/polywhatever capacitors are not like electrolytics which 'can stand' an over-voltage for a brief time; they zap through within millisec. finish. (The fact that they did not here must be credited to the safety factor allowed in the Suzuki manufacturing.)</p><p></p><p>Other smaller points need attention i.e. a rather moderate overshoot at 100kHz with a square wave; I have not yet tested all the many features for accuracy yet. </p></blockquote><p></p>
[QUOTE="Ampdog, post: 61699, member: 144"] F-D, Yes, they have, but not because they leaked - they were perfect. But they were rated at 350VWK. At start-up, before the valve cathodes start emmitting, there is the full unloaded h.t. plus 6L6 bias voltage across them: 500V + 50V = 550VDC. (The amp uses Si-diodes instead of a valve rectifier, applying h.t. immediately upon turn-on.) Polyester/polywhatever capacitors are not like electrolytics which 'can stand' an over-voltage for a brief time; they zap through within millisec. finish. (The fact that they did not here must be credited to the safety factor allowed in the Suzuki manufacturing.) Other smaller points need attention i.e. a rather moderate overshoot at 100kHz with a square wave; I have not yet tested all the many features for accuracy yet. [/QUOTE]
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Audio and Video Talk
Vinyl
SANSUI AU111 valve amplifier service
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