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Amperex 6DJ8 tubes with no shield

I have one pair of Amperex 6DJ8 tubes marked Made in Holland, Orange Globe logo. There is No shield between the plate, grid, cathode structure and the small O getter. I have lots of Amperex 6DJ8s, Holland and USA, but all have a shield. Does anybody know anything about these?
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tomcy6's avatar
tomcy6
2,544 posts
 
Check out the Tubemonger NOS Picture Library and maybe that can help.

Here is a link to a 1966 6DJ8, which is the oldest  Amperex they have before they went to the A frame:

http://www.tubemongerlib.com/gallery2/v/6DJ8/Amperex+Philips+ECC88+6DJ8+1966+Halo+Getter+Miniwatt+Label+1+-+Heerlen+Holland.jpg.html

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