Sorry, mine isn't, totally different.
You have Harbeth speakers, I note. Last year Harbeth issued a challenge regarding amps and their speakers. They claimed, at the same volume, people wouldn't be able to hear differences between amplifiers. The prize was a set of their top speakers. You could choose what amps and music you wanted, the only rider was you had to use a foot switch for instantaneous switching between amps, and Harbeth would help you make one - they even told you what parts to get.
There were no takers, despite the fact this was advertised from Stereophile to What HiFi. Instead, there was a lot of dispute about the tests, how they couldn't work, how it was a publicity stunt from Harbeth etc etc. For once, objectivists and subjectivists were united in condemning the challenge.
I spoke to Harbeth, having heard belatedly about the challenge. It had lapsed, but the person to whom I was speaking, the man himself, was stunned and disappointed that there was no response, despite the lure not only of his top speakers as a prize, but a day including lunch at the factory. We got to talk of many things, but, when finally I hung up, I began to understand that audiophiles, or people interested in hifi anyway, want to believe the myths, they don't want them tested even by the most credible of sources no matter what the incentive.
I think a lot have that has come into play on this thread. If Clearaudio had said yes, they used OEM for their MM cartridges, they would have been accused of profiteering. If they said, as they did, they did not, no-one would believe them.