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Audio and Video Talk
Valves / Vacuum Tubes
Sylvania 5687WB?
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<blockquote data-quote="Ampdog" data-source="post: 793607" data-attributes="member: 144"><p>JohnnyIC,</p><p></p><p>Oops! No. </p><p></p><p>They could not be less similar. As said, ? of 17-18 vs. ? of 100 for 12AX7. There is a 'figures only' subsistute for 12AX7 but I cannot recollect now. But 'special' valves are often not any different for audio, where ruggedness and gold plated pins provide no advantage. (Yes - a signal will come through using either; that does not mean that fidelity is similar. The operating conditions differ substantially.)</p></blockquote><p></p>
[QUOTE="Ampdog, post: 793607, member: 144"] JohnnyIC, Oops! No. They could not be less similar. As said, ? of 17-18 vs. ? of 100 for 12AX7. There is a 'figures only' subsistute for 12AX7 but I cannot recollect now. But 'special' valves are often not any different for audio, where ruggedness and gold plated pins provide no advantage. (Yes - a signal will come through using either; that does not mean that fidelity is similar. The operating conditions differ substantially.) [/QUOTE]
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Audio and Video Talk
Valves / Vacuum Tubes
Sylvania 5687WB?
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