For sale 5 tubes e83f Valvo pinched waist 

yellow ink same code , matched tubes 

full sleeve of 5 pieces same code same year of production , same week 

selected postal tube G.Abl markings 

same data  15 September year 1959, same code on glass 42H 

code on boxes match with code on glass of the tubes 

tested on tube tester Funke W19S = 12.5mA ; 13.5mA  ; 13.5mA ; 14mA ; 14mA (reference good at 6mA) 

with 200 volt on anode

reference 100%: 10mA with 210 Volt on anode 

production code WF1 △ 0 D / 10660 G.Abl  same code for all tubes 

4 seams on top 

D getter (horseshoe top getter) 

mesh shiled / plate 

with own carton box selcted postal tube G.Abl 

lifetime 10.000 hours 

power pentode for last stage audio longlife vintage tube selected 

hard top fins tubes in such conditions time capsule 

box 196

sleeve 1