Ultrix-11

[Douglas Taylor via cctalk]

I ran into a YouTube video, that it is 5 years old, titled "Ultrix-11 
3.1 on an emulated PDP-11/73" and I found it very interesting.
It shows installation of Ultrix-11 under SIMH.  The fellow steps through 
the installation process and appears to be quite knowable.
I wanted to replicate it but couldn't locate the *.tap file used in the 
video that was an image of the bootable TK50 distribution.
Bitsavers and tuhs.org have Ultrix-11 files, but not the bootable tape 
image.
Anyone know where the tape image is located?

Doug