With a lot of sources i need to switch. I tried/made some preamplifiers but they all coloured the sound. So i changed plans and made a Transformer Volume Control (TVC). Happily these items are more common available today.
As this preamp (better name: pre-attenuator) is really balanced i used 2 stereo-TVC's. Each stereo-switch takes care of the + and - signal.

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