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Tube phono preamps
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<blockquote data-quote="handsome" data-source="post: 633983" data-attributes="member: 772"><p>I tweaked the RCA phono stage myself, slapped a buffer on the output, re-diddled the eq network and used a semi regulated PSU for the front end. It is a very pleasant phono stage - i prefer it to my ARC SP9 - but it has way to much input capacitance. High gm tubes are definitely the way to go but again it's the input capacitance that lets them down - unless of course you are using an MC cartridge.. As ampdog mentioned the cascode is the logical engineering solution but now one has to babysit a low noise input that has almost zero PSRR........</p></blockquote><p></p>
[QUOTE="handsome, post: 633983, member: 772"] I tweaked the RCA phono stage myself, slapped a buffer on the output, re-diddled the eq network and used a semi regulated PSU for the front end. It is a very pleasant phono stage - i prefer it to my ARC SP9 - but it has way to much input capacitance. High gm tubes are definitely the way to go but again it's the input capacitance that lets them down - unless of course you are using an MC cartridge.. As ampdog mentioned the cascode is the logical engineering solution but now one has to babysit a low noise input that has almost zero PSRR........ [/QUOTE]
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Tube phono preamps
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