Quote Originally Posted by wfwhitaker
What kind of "tubes" are we talking about here? Something other than a JOBO drum, it appears.
We're talking about BTZS tubes as described in Phil Davis book Beyond the Zone system. I and many others have simply made our own from normal diy materials

Do a search on APUG and I am sure you will find details of how to make them big enough for 8x10 (10x8)

Phill