Looking for pure copper or Cu/Au bananas

Try these.

@brunomarcs , You want 3M heat shrink. It is the best. 

I have struggled over the years to find just the right heat shrink for particular projects.  I do like the 3M heat shrink for most things and it does come either with/without adhesive.  However, sometimes I have looked for thicker heat shrink for certain projects such as the ends of power cables, or even speaker cable connectors that will get a lot of handling over time.  I have sometimes found what I wanted at Partsconnexion but you might also look at what is available at this place.

ETI Research LINK Banana speaker cable connector, however are somewhere around 50% more than your budget.



@brunomarcs - dual wall heat shrink is the generic name for heat shrink with hot glue inside the heat shrink.

@mitch2 - those Furez copper spades look pretty effective and cool too.

@mijostyn - I like Monosaudio spades, and these look nice, but fail on one important aspect: Need the outer shell to be an insulator. Actually need to check if the Aeco is plastic or not, but it looks thin enough I can heat shrink an insulator  around it.