I don't own the Quad 909 and I'm not familiar with the binding posts they use. However, I have owned other modern amps from British companies that used some odd binding posts (by US standards). I believe they may be posts that comply with the BFA standard. If this is the case, you may have plastic buttons installed in the ends (as stated by Geared4me). You may be able to pry these buttons/plugs out of the ends and use bananas. Also, if they are BFA type post, the may actually have a pin in the center that prevents using standard bananas. If that is the case, the BFA type of banana plugs, like the Nordost Z-plugs or similar BFA compliant models, work great.
I used a pair of cables using Nordost Z-plugs on my Arcam Alpha 10 with outstanding results. The BFA banana plugs make an excellent mechanical connection with these types of binding posts.
Enjoy,
TIC
I used a pair of cables using Nordost Z-plugs on my Arcam Alpha 10 with outstanding results. The BFA banana plugs make an excellent mechanical connection with these types of binding posts.
Enjoy,
TIC