F5X -- the EUVL Approach - The Build Thread

I am very late in this thread, but will ask anyway. I just built an FT to full satisfaction. Now I want to take the next step to balanced, and started looking into the F5X. One of the differences of the F5X design and Nelson Pass' outlook to balanced in his F5T paper are the transistors Q3, Q4, Q17 and Q18. There are in the F5X, but not in Nelson's design. I searched both this forum and the F5X EUVL Approach thread, but could not find an explanation for these transistors. Can any one help me there? Also, the types BC560C and BC550C are no longer available, so I need replacements.
 
Anyone recognise the stickers and packaging on these transistors, they are supposedly for the F5X but cannot be sure?
 

Attachments

  • 20221103_174139.jpg
    20221103_174139.jpg
    291.9 KB · Views: 99
These look like the ones that I got as part of this group buy (Edit: this was not arranged by Xen, but was a group effort, see below).

Due to my life going off the rails, mine are still in the original packaging from that GB.

Edit: I was just looking for toshiba fets in the buy swap just now and it seems he sold them in 2022 Here anyway.
 

Attachments

  • WIN_20230803_15_51_48_Pro.jpg
    WIN_20230803_15_51_48_Pro.jpg
    211.6 KB · Views: 67
Last edited: