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Audio and Video Talk
Valves / Vacuum Tubes
Sansui AU111 Valve Amplifier
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<blockquote data-quote="Ampdog" data-source="post: 277053" data-attributes="member: 144"><p>Apology MooN,</p><p></p><p>Read that only now.</p><p></p><p>Gee - I cannot recall! I did look up the schematic just now but could not find a physical picture of the amplifier. Are those pre-sets at the back or front-panel controls? They pre-set the input gain; I am not sure why as everything remains in the original ratio.</p><p></p><p>Anyway, to answer your question: If you find the main volume control managable i.e. not too 'sensitive', you might as well remove those - just add a 470K resistor in place to common. Then you must just know not to have inputs so high that you hardly advance the main volume control for comfortable volume. There are stages after VR1 and VR2 but ahead of the main volume control that might then be overloaded. (I am thinking of some CD-players with their >1V output signals; not sure whether such is still the case. If so it should be an easy matter to 'equalise' everything with resistive dividers at their respective inputs.)</p></blockquote><p></p>
[QUOTE="Ampdog, post: 277053, member: 144"] Apology MooN, Read that only now. Gee - I cannot recall! I did look up the schematic just now but could not find a physical picture of the amplifier. Are those pre-sets at the back or front-panel controls? They pre-set the input gain; I am not sure why as everything remains in the original ratio. Anyway, to answer your question: If you find the main volume control managable i.e. not too 'sensitive', you might as well remove those - just add a 470K resistor in place to common. Then you must just know not to have inputs so high that you hardly advance the main volume control for comfortable volume. There are stages after VR1 and VR2 but ahead of the main volume control that might then be overloaded. (I am thinking of some CD-players with their >1V output signals; not sure whether such is still the case. If so it should be an easy matter to 'equalise' everything with resistive dividers at their respective inputs.) [/QUOTE]
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Audio and Video Talk
Valves / Vacuum Tubes
Sansui AU111 Valve Amplifier
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