Replace or repair RGR Model Four preamp?

[E-Stat]

I Lately the signal has (intermittently) been muddled when using the CD player or tuner. When the signal isn't muddled it sounds fine.

If all you use is high level inputs and the cable from pre to power is short, then you might find that you need no preamp at all. Make yourself some attenuators for $20 instead. Switching sources would require cable switching.

I get higher resolution in my main system using the CD source where the gain of my preamp (used for vinyl only) is not needed.

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