Thanks so much for your replies - that was what I needed.
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According to this link about the 4004 mk II, the input impedance is 22 Kohms. If memory serves me right, the input impedance did not change between the original 4004 and the mk II revision. However, on that link there is a way to contact Aragon or Indy Audio Labs for technical support from the menu on the left hand side of the page. Perhaps they could be of more assistance. Cheers, John |