SEX Kit iron upgrade-power supply upgrade

[peterhill2]

Hello- I have a SEX amplifier purchased and built in 2006. I would like to purchase the upgraded transformers and power supply mods.
Not sure if I have original SEX or 2.1 version. Are any the available upgrades usable on an amplifier this old? How significant a sonic  improvement?
Thanks for your help!
Peter

[Natural Sound]

I believe this is what you are looking for.
https://bottlehead.com/?product=iron-upgrade-kit-for-s-e-x-kit-2-0

I'm assuming the "power supply upgrades" you speak of is actually the C4S upgrade. I believe that the upgrade kit for your version of S.E.X. amp is out of production.
https://bottlehead.com/product/s-e-x-kit-c4s-active-load-upgrade-2-0-and-earlier-2/

However, with a little ingenuity and some help from this forum you could probably make this one work.
https://bottlehead.com/product/s-e-x-2-1-c4s-upgrade-kit/