this one is diabolicalOn this topic, is anyone here familiar with the Youtuber Mend It Mark? Genuinely warm and engaging chap who repairs audio equipment to a high standard.. He was sent a £25k preamp to repair by the manufacturer who challenged him that he wouldn't be able to repair it. When he did repair it (and write his own schematic and service manual for the rather shoddily made thing) the manufacturer appears to have put a copyright claim on his video and had it removed from youtube.
this is a £25k Tom Evans Master Groove phono preamp and I can almost understand Tom Evans if they did not engage Mark in his services but they paid him for the repair and they clearly did not like the conclusions Mark came to