Need assistance on capacitors quoted in diagram as C3 and C7. These are shown as being 100 nano electrolytic.

I have been around electronics for many years and have never seen an electrolytic under 470 nano and rare at that. None are listed in any suppliers here in Aus.

Can these be substituted by 100 nano MKT / 50 volt? (MKT = metalised polyester film)

or/ is there an error in the diagram and parts listing?