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Audio and Video Talk
Valves / Vacuum Tubes
Ideas for MM valve phonostage
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<blockquote data-quote="fredeb" data-source="post: 954730" data-attributes="member: 13623"><p>OK - I'm going to have to check out the high gm valves then . </p><p></p><p>Ampdog , how does one reconcile a higher power output tube ( like 12au7 ) with a higher gain tube ( like 12ax7 ) ? In the instance of this here Berclowe 3 valve phonostage . </p><p></p><p>Will a 12au7 make a difference in the buffer ( output ) stage , other than having a lower Rp than for eg , a 12ax7 ? I'm wondering whether going from high gain to med gain and then finally to low gain in the buffer , or whether , by drive ability it's easier to make all 3 double triodes the same model valve .</p><p></p><p>Sent from my SM-G935F using Tapatalk</p></blockquote><p></p>
[QUOTE="fredeb, post: 954730, member: 13623"] OK - I'm going to have to check out the high gm valves then . Ampdog , how does one reconcile a higher power output tube ( like 12au7 ) with a higher gain tube ( like 12ax7 ) ? In the instance of this here Berclowe 3 valve phonostage . Will a 12au7 make a difference in the buffer ( output ) stage , other than having a lower Rp than for eg , a 12ax7 ? I'm wondering whether going from high gain to med gain and then finally to low gain in the buffer , or whether , by drive ability it's easier to make all 3 double triodes the same model valve . Sent from my SM-G935F using Tapatalk [/QUOTE]
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Audio and Video Talk
Valves / Vacuum Tubes
Ideas for MM valve phonostage
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