The PHILCO Phorum

Is the 39/44 tube a replacement for the type 44 used in early 30's Philco sets?

Yes.

The 39/44 replaces both the 39 and the 44.

Many thanks for that info, Ron. I hope all is well on your end. It's been awhile since I've run into you.

You're quite welcome, my friend; I hope all is well with you also.