My bag of Neutrik dual-bananas arrived today. I ordered them from markertek.com. They weren't the cheapest but cheap enough at about $1.70 each (more for red, for some reason), and shipping wasn't inexpensive, but they did show up in just two-days. Next time I'm visiting my daughter at college I'll stop by their place in Saugerties, NY, and see what they're all about.
The Neutrik dual-banana plugs are impressive. I've lived with "cheap" RatShack versions at about $4/each, Chinese junk from Parts Express, and even Peavy stuff from my local guitar shop for not-small change for years. Some of the Chinese stuff even had the indicator tab on both sides of the plug—a big help when working blind behind the amp (yeah, I filed them off). I guess they figured if one was good, two would be better.
But the Neutriks are superb. The wire ends are completely enclosed, the contact surfaces are well made, and the standard toothed cable-clamp works well with the "Moonshine" cable. The plated contact elements are even keyed (square) so you can assemble them rotated in 90º increments and they stay put. The fit and material quality is superb for such an inexpensive part. I was so impressed, as I have been with every Neutrik product, that I felt compelled to stage a photo to show just how well thought-out and constructed they are.
The Neutrik part numbers are NYS508-B (for black) and NYS508-R (for red) and I've seen them offered in Europe in an even broader assortment of odd-ball colors. They're available for as little as $1.50 in quantities of ten elsewhere but markertek was a pleasure to deal with even when I called them to tell them they left out several of the toothed cable clamps (notice the black insert in the open red plug in the photo below). I recommend these if you're using dual-bananas on either your amps or your speakers, especially with big cables.