Here is the link to Ayumi's website. It is in Japanese so you'll need to use a translator.
Ayumi's Lab
If you are looking for a collection of Ayumi's models pre-formatted for LTspice, go to the following page here at diyAudio.
https://www.diyaudio.com/community/threads/vacuum-tube-spice-models.243950/post-3662623
Ayumi's Lab
If you are looking for a collection of Ayumi's models pre-formatted for LTspice, go to the following page here at diyAudio.
https://www.diyaudio.com/community/threads/vacuum-tube-spice-models.243950/post-3662623