I'm not sure the 9mm spades will do. Those are jagunda binding posts. My solution is to put the spade in top down through the post hole and then tighten down. It works just fine.
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Don't put the spade through the hole. The hole is not flush at the base, only a hairs worth of contact will be made. I would use locking bananas with that amp through the back of the binding posts. If you can actually hear the difference between locking bananas and spades, maybe your out of my league wrt hearing and my suggestions should be ignored :-)
Socrates, I agree with you as I have tried it when I first got this amp. Made me nervous to have such minimal contact. Clearly looked less than adequate to me. It is a weak connection that you can't really torque down very well. I found that the nut would keep getting loose. Rick from VD suggested the spades as being best, but I too wonder if the difference would be audible? Can anyone verify that spades are sonically better than bananas? I prefer spades and they would be better suited for when I upgrade my amp, but gotta do what you gotta do! Thanks.
R1b61, Be very cautious of that connection! Check it from time to time for loosening. I eventually had to get bananas for the AP wires I had at the time and then got the banana adapters for the Cardas.