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Audio and Video Talk
Valves / Vacuum Tubes
Quad II trouble
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<blockquote data-quote="charles" data-source="post: 399278" data-attributes="member: 2759"><p>Dear Maestro,</p><p></p><p>Some more advise. Usually as step number one I test the valves with a valve tester. This gives one peace of mind regarding its condition. Very important is the cathode/heater insulation test with a valve tester. I have tested a lot of power valves such as the KT66's and others that had very low cathode/heater insulation resistance readings even if the valve tests 100% regarding its Ia characteristic - a valve with this problem may destroy for e.g. an output transformers. </p><p></p><p>This is if one has access to a valve tester.</p><p></p><p>Kind Regards</p><p></p><p>Charles</p><p></p><p> </p></blockquote><p></p>
[QUOTE="charles, post: 399278, member: 2759"] Dear Maestro, Some more advise. Usually as step number one I test the valves with a valve tester. This gives one peace of mind regarding its condition. Very important is the cathode/heater insulation test with a valve tester. I have tested a lot of power valves such as the KT66's and others that had very low cathode/heater insulation resistance readings even if the valve tests 100% regarding its Ia characteristic - a valve with this problem may destroy for e.g. an output transformers. This is if one has access to a valve tester. Kind Regards Charles [/QUOTE]
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Audio and Video Talk
Valves / Vacuum Tubes
Quad II trouble
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