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Audio and Video Talk
Valves / Vacuum Tubes
Restoration of Leak 12 Point One mono-blocks
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<blockquote data-quote="Ampdog" data-source="post: 897117" data-attributes="member: 144"><p>Charles,</p><p></p><p>Just refreshment: The input valve, particularly if a pentode, adds negligible distortion to the total compared to the output valves. It might be that the particular EF37 has low Gm (thus gain), thus there is lower overall NFB. I would rather consider that.</p><p></p><p>Check the spectrum if you can: Mostly 3rd harmonic (unlikely) does mean it might be the pentode. Mostly 2nd harmonic, likely output stages because of lower NFB. </p><p></p><p>[But 0,06% (at maximum output?) is lower than spec - so why worry?)]</p></blockquote><p></p>
[QUOTE="Ampdog, post: 897117, member: 144"] Charles, Just refreshment: The input valve, particularly if a pentode, adds negligible distortion to the total compared to the output valves. It might be that the particular EF37 has low Gm (thus gain), thus there is lower overall NFB. I would rather consider that. Check the spectrum if you can: Mostly 3rd harmonic (unlikely) does mean it might be the pentode. Mostly 2nd harmonic, likely output stages because of lower NFB. [But 0,06% (at maximum output?) is lower than spec - so why worry?)] [/QUOTE]
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Audio and Video Talk
Valves / Vacuum Tubes
Restoration of Leak 12 Point One mono-blocks
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