Cello - if you're Cortese is like mine, it uses E180F (6688)and 6922 tubes for the phono section.
The stock Cortese tubes are actually pretty good compared to the expensive NOS variety. The differences in sound resulting from changes in phono tubes is less than the differences produced by the line stage tubes.
I've tried quite a few and I think the Telefunken CCa's in the 6922 position are (so far) the best for me. I use Mullard E180F's I picked up for 10 bucks on Ebay and they're okay... not much different than the stock tubes.
hope this helps.
The stock Cortese tubes are actually pretty good compared to the expensive NOS variety. The differences in sound resulting from changes in phono tubes is less than the differences produced by the line stage tubes.
I've tried quite a few and I think the Telefunken CCa's in the 6922 position are (so far) the best for me. I use Mullard E180F's I picked up for 10 bucks on Ebay and they're okay... not much different than the stock tubes.
hope this helps.