EIMAC 8165/4-65A DIY Integrated Amplifier-Parallel single end / Sigma fp

I bought this DIY amplifier many years ago. Because it’s a very high voltage tube, I never used it before.
After back from checking with the expert, I found this tube amp has a lot of mid-bass as the RF tube style. I don’t know well about electronics. I did shoot this amp because it looks beautiful to me. Please enjoy the Video.

Information:
Eimac 8165/4-65A
RF power vacuum tube
Equivalent QY 3-65 , CV1905

https://frank.pocnet.net/sheets/140/8/8165.pdf
https://www.jimmyauw.com/2014/02/16/the-beauty-of-eimac-tube-eimac-81654-65a-and-eimac-vt-129304tl/

Film equipment:
Sigma fp
Nikon 105 f2.8 macro
Hasselblad CF80 f2.8
Nanlite
Zeapon micro