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Audio and Video Talk
Valves / Vacuum Tubes
4,8,16 Ohm OPT taps question (leak amp)
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<blockquote data-quote="Mars" data-source="post: 251938" data-attributes="member: 817"><p>Hi darrylo</p><p></p><p>It is hard to advise you on using the 4 ohm tap vs. the 8 ohm tap without knowing the way the OPT was wound :Ooooooh: . Leak designs are pretty well done :notworthy: generally speaking, so you should not experience losses when you connect a 4 ohm speaker to the 4 ohm tap.</p><p></p><p>Depending on the amp/OPT you use, I have found I sometimes like the 4 ohm tap better (even for a 8 ohm speaker) than the 8 ohm tap. The reflected load to the power tubes are doubled, and that can effect better damping and lower distortion. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite2" alt=";)" title="Wink ;)" loading="lazy" data-shortname=";)" /></p><p></p><p>That said, higher load on the power tubes implies higher voltages on the primary windings when the music plays. When voltage peaks start to exceed 1500V :faint: (maybe a scratch on you record, or a fingerprint on the cd) arcing can happen on the sockets [typically between pin 2 (filament at low potential) and pin 3 (anode at high potential)] or worse; inside your OPT. If this happens repeatedly, the amp eventually fails :'(</p><p></p><p>If you can give us the exact model or OP transformer model number or stamped code, we can advise you in more detail.</p></blockquote><p></p>
[QUOTE="Mars, post: 251938, member: 817"] Hi darrylo It is hard to advise you on using the 4 ohm tap vs. the 8 ohm tap without knowing the way the OPT was wound :Ooooooh: . Leak designs are pretty well done :notworthy: generally speaking, so you should not experience losses when you connect a 4 ohm speaker to the 4 ohm tap. Depending on the amp/OPT you use, I have found I sometimes like the 4 ohm tap better (even for a 8 ohm speaker) than the 8 ohm tap. The reflected load to the power tubes are doubled, and that can effect better damping and lower distortion. ;) That said, higher load on the power tubes implies higher voltages on the primary windings when the music plays. When voltage peaks start to exceed 1500V :faint: (maybe a scratch on you record, or a fingerprint on the cd) arcing can happen on the sockets [typically between pin 2 (filament at low potential) and pin 3 (anode at high potential)] or worse; inside your OPT. If this happens repeatedly, the amp eventually fails :'( If you can give us the exact model or OP transformer model number or stamped code, we can advise you in more detail. [/QUOTE]
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Audio and Video Talk
Valves / Vacuum Tubes
4,8,16 Ohm OPT taps question (leak amp)
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