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Help with KT88 Bias
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<blockquote data-quote="Jaded Faith" data-source="post: 145243" data-attributes="member: 1068"><p>You should never operate your tube amp without a load or speaker(s) connected. If you do, the result will be a high level of induction voltage that could damage ? or even destroy ? your amp?s output transformer and tubes. A power amp is designed with a specific B+ and primary impedance on the output transformer. The transformer expects to see a load on the secondary side to balance and complete this equation. If you do not, you are straining the primary side and it will fail. Your power tubes will also fail in short order as well.</p><p></p><p>Also, understand that there are no "correct" bias voltage for any given tube type. Bias is a negative voltage used to set the quiescent point and you need to know what plate voltage a tube sees to calculate the proper bias point. Your friends advice about where to set KT88's may be correct for them in one amp (actually for one seeing about 550V of B+) but not all. Use 42-49mV in the Randall.</p></blockquote><p></p>
[QUOTE="Jaded Faith, post: 145243, member: 1068"] You should never operate your tube amp without a load or speaker(s) connected. If you do, the result will be a high level of induction voltage that could damage ? or even destroy ? your amp?s output transformer and tubes. A power amp is designed with a specific B+ and primary impedance on the output transformer. The transformer expects to see a load on the secondary side to balance and complete this equation. If you do not, you are straining the primary side and it will fail. Your power tubes will also fail in short order as well. Also, understand that there are no "correct" bias voltage for any given tube type. Bias is a negative voltage used to set the quiescent point and you need to know what plate voltage a tube sees to calculate the proper bias point. Your friends advice about where to set KT88's may be correct for them in one amp (actually for one seeing about 550V of B+) but not all. Use 42-49mV in the Randall. [/QUOTE]
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Help with KT88 Bias
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