What size tube should I use

[crodan85]

I managed to get a job lot of copper tube all 300mm long but three different sizes 108mm, 74mm and 53mm diameter and Im not sure which to use for my dice tube.

Top View (http://img250.echo.cx/img250/3382/dryictop8np.jpg)
Front View (http://img234.echo.cx/img234/7240/dryicfro8mr.jpg)

[craig588]

I think 74MM would be fine, that's how big I made my CPU LN2 tube.

[crodan85]

Thanks Im going to buy some copper for the base plate today.