The best taps may depend on the amplifier. Try 8 or 16 and hear what sounds best.
I’ve tried many amps on my Quads. The Heath UAD-1 sounded good in a reflective space, but didn’t have enough power to drive them in my living room. A Scott 5791 integrated was just OK. An Anthem Integrated One was nice on midrange, but loose on the low end. A Bedini 25/25 was also pretty good overall, but was unreliable, and replacement caps made it a bit thin-sounding. Finally went up a bit in price and got a used Cronus Magnum. It ticked all the boxes. But I still needed a sub to cover the lowest frequencies (an 8” Velodyne, crossing over gently at 50hz). Swapped the KT88’s for KT120s and barely use the sub anymore. Should add that the speakers had been upgraded by One Thing Audio by the previous owner, with the benefit of extended high frequency response and added power protection. The Quads are magical for many kinds of music, but not all. Also, even when perfectly positioned, their magic can only really be experienced within an 18” circle that fits only one head at a time. Definitely not a “social speaker”- more like a awesome set of room-size headphones.
I should add that they also benefit from any improvements at the source end. Assuming a good preamp with phono, you may well find that the shape of your stylus has a bigger impact on sound quality than anything else in the chain.