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Classic gear from yesteryear; vintage audio standing the test of time.

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Reissue Quad preamp question...

Posted by gkargreen on February 27, 2017 at 17:03:29:
I was asked to work on one of these reissue Quad preamps, the client says that the line level inputs have a wonderful "shimmer" to the sounds, whereas the phono inputs sound muddy and loses vitality. Upon opening this up I see it is an op amp front end for the phono, with one of those miniature tubes soldered in for use as a ?? (dual triode, maybe as a cathode follower or a line level voltage amp, don't have the schematic with this one). Any ideas what is going on with this? The client says that using a cheap phono preamp plugged into the line level inputs gives that nice "shimmer", but not through the on-board phono stage. Thanks