Octal Tube Prototyping Stand Frame

This is a tube-holding stand that can be used for prototyping circuits using octal vacuum tubes (like the 6L6, KT66, KT88, etc...). Has space for placing 5mm pitch screw terminal blocks which can be connected to the leads of a tube socket. I used short 4-40 machine screws to hold the tube socket to the top plate and long ones to fasten the legs.