Re: Interconnect lengths.
As above, fine for transistor equipment with outputs of low source impedance. I have often run 10-20m of unbalanced shielded cable from domestic -10dBV phono outputs.
Cable capacitance is more critical for line outputs from domestic valve equipment that has high output impedance, in which case long cables will form an RC low-pass filter that encroaches on the top of the audio spectrum and rolls off the treble. Professional valve (studio) gear solved this problem by driving all outputs with matching transformers to lower the impedance (and balance it) and make it uncritical of the interconnect capacitance.
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