It doesn't appear to be a full-on 25RS here, but maybe the "S" stands for "special"? I could be a bit wrong there, but either way, looks to be definitely some differences in the resistors. Never mind, I see James has replied.
Yes, I should do the line stage upgrades as a minimum possibly, as I am still phono-less at the moment, oh the horrors! Anyway, well done James!
Holbo TT-Nag 110-Croft phono/Innuos Zen MK2/LinnenberG Telemann DAC-Preamp/LinnenberG Allegro monoblocs/Duevel Venus/LinnenberG Maestro SE-Senn. 660S DH Labs cabling
Croft Series 7 amps, WLM La Scala, Naim Uniti1, Naim Nait XS3, Naim ND5XS2, Guru Junior