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Audio and Video Talk
Valves / Vacuum Tubes
E80CF and a new phase-splitter
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<blockquote data-quote="Ampdog" data-source="post: 1090218" data-attributes="member: 144"><p>Usually hum. </p><p></p><p>This could be quite soft, however, so also confirmed with an oscilloscope. (I have used a few other triode-pentodes without this symptom. Yes, the 7199 was never universally accepted; too many other similar but less expensive valves on the market. (Although most have been developed for r.f. use, they work well in audio except at low signals eg. pre-amp input stages.)</p></blockquote><p></p>
[QUOTE="Ampdog, post: 1090218, member: 144"] Usually hum. This could be quite soft, however, so also confirmed with an oscilloscope. (I have used a few other triode-pentodes without this symptom. Yes, the 7199 was never universally accepted; too many other similar but less expensive valves on the market. (Although most have been developed for r.f. use, they work well in audio except at low signals eg. pre-amp input stages.) [/QUOTE]
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Audio and Video Talk
Valves / Vacuum Tubes
E80CF and a new phase-splitter
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