Chapter 6Precision preamplifier ’96, Part II

(Electronics World, September 1996)

The input switching was a radical new design that gave exceptionally good isolation between the inputs. You could argue that this was pointless as no one sensible would be running sources into the amplifier apart from the one they were actually listening to, and you might be right. Morgan Jones raised this particular issue with a recommendation that alternate positions on rotary input-select switches should have every other switch position grounded to reduce inter-source crosstalk [1], and so I decided to see what could be done with push-switches instead. The answer is −95 dB at 10 kHz, which I would suggest is enough for most of us.

The following line input stage, ...

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