Retrotech:

Adrian's Digital Basement (retrotech repair)

RMC The Cave (retro curation and stories)

Cntl Alt Rees (retro eclectic)

Jan Beta (repair)

LGR (eclectic)

Mr. Carlson's lab (repair of generally older RF, but some newer)

CuriousMarc (repair, testing, stories. Did a complete repair of the Apollo Guidance Computer)