http://ch.to/tubes
used parts , that was hold over 40 jears in my (foretten)
inventory.
Also from my knowlwdge an experiences i can find any old devices .
From first "industrial" transistor - all types .
Some special manufactured technoly cand replace with others.
(example Germanium Driftfield Power Transistors , one some people
know this old obsolete technik. Ask what is your problem , I try to help.
Gustav Pese Trier Germany