Replace opamps in Philips 963SA sacd player

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This SACD player uses the AD1955 DAC and uses opamps for I/V conversion and buffering. It sounds pretty good stock but I think there is more to be had with this DAC. I'm considering doing a tube output stage or trying an LC Audio Zapfilter. I've never useds a Zapfilter before so I don't know how good they are. Does anyone have any suggestions they would care to share on how to hot rod this balanced, current output DAC?

-Ed
 
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