Tube amplifier case

AIYIMA 6A2 Tube Preamplifier Amplifier

https://www.aliexpress.com/item/1005001828613892.html

XH-A232 High-definition Digital Audio Amplifier Board

https://www.aliexpress.com/item/1005005254316937.html

[M3 x 5 x 4 insert] x 4

[M3 x 25 bolt] x 4