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Audio and Video Talk
Valves / Vacuum Tubes
Sansui 1000A Transformers on chassis
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<blockquote data-quote="fredeb" data-source="post: 762740" data-attributes="member: 13623"><p>Those in the know can correct , but as I understand ..... </p><p></p><p>Fixed bias is adjustable negative voltage on the grid so as to apply correct idle current ( 0 signal ) on the plate of each individual valve . Any fluctuation on the grid ( from applied signal ) will cause current and emission to increase .</p><p></p><p>The advantage of fixed bias is that unmatched valves can be used together ( within reason ) , each valve can be individually set so that all display similar idle current . I guess that theoretically the valves should wear down at the same rate , but all things are never quite equal . As emission decreases in time , the valves can again be adjusted to correct ( or desired ) idle current . </p></blockquote><p></p>
[QUOTE="fredeb, post: 762740, member: 13623"] Those in the know can correct , but as I understand ..... Fixed bias is adjustable negative voltage on the grid so as to apply correct idle current ( 0 signal ) on the plate of each individual valve . Any fluctuation on the grid ( from applied signal ) will cause current and emission to increase . The advantage of fixed bias is that unmatched valves can be used together ( within reason ) , each valve can be individually set so that all display similar idle current . I guess that theoretically the valves should wear down at the same rate , but all things are never quite equal . As emission decreases in time , the valves can again be adjusted to correct ( or desired ) idle current . [/QUOTE]
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Audio and Video Talk
Valves / Vacuum Tubes
Sansui 1000A Transformers on chassis
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