Reasonable RCA Connectors?

The Pure Harmony is a good place to start! 

How many hours break in time for Pure Harmony?

Sounds great right away and a very slight bit of brightness fades away in 100-150 hours. 

I never seen such compatibility issue between RCA connectors before!

Yesterday I soldered KLEI Pure Harmony RCA connectors to my DIY Duelund DCA16GA cable.
When I connected these RCA to my Chord Qutest DAC, I damaged Qutest female RCA connector central pin contact.
After that, I opened Qutest and see contact plate was moved from its place.
I returned contact plate to it’s place.
Now my Qutest works again! But I can’t use KLEI RCA connectors with it.
On other hand I can use cable with KLEI RCA connectors between my phonostage and amplifier. Both use Vampire female RCA connectors.

This review is my IMHO.
I compared two similar Duelund tinned stranded copper twisted pair of 16 gauge.
One was with KLEI Pure Harmony RCA other with Switchcraft RCA.
KLEI sound much cleaner. The focus of instrument is pinpoint.
Instrument separation is great. The sound is super smooth. Tonal balance is on the warm side of natural. Compared to Switchcraft, midrange is lusher.
Swichcraft sound dirty, soundstage is big but instruments focus and separation are not such great. But Swichcraft wins in dynamic, speed and more real tone of brass instruments. Swichcraft sound is more open, KLEI is fuller and darker.
KLEI serves music in contemplative way. It good for baroque music for east cost cool jazz.
Switchcraft shows more emotional side of music.