[Boatanchors] Tube ID's

[LARRY D GODEK]

I unearthed a couple of tubes today taht i've not ever heard of this particular type designation.
 
One is a Mullard PM14, one is a Mullard P.M.2 and the third is a Telefunken RGN 354.  In their very good condition original boxes.  Surprise me!
 
What they used for or in?
 
Also unearthed 3 more of the EF-50 types with new  sockets for them.  Think that gives me 4 of them now, for what, i don't know.
 
Larry
W0OGH