steakster, I found a couple of references to splatter shields, first from Joe’s Tube Lore:
"The next structure up is the unique one it’s a horizontal, circular, metal disc supported by two metal bars. I’ve seen & heard this referred to as a shield or a splatter shield. Which name is correct & what is the purpose of this structure? I don’t know, but most all early 6DJ8 family tubes have it."
https://www.audioasylum.com/scripts/d.pl?audio/faq/joes-tubes.html#6DJ8
and this out-of-stock tube on Tubemonger’s site:
"LORENZ Stuttgart PCC88 7DJ8 SINGLE TUBES Gray Shield 1960s MINT NOS OEM NO LABEL - Getter Ring Fused with Splatter Shield Construction - Made in Germany"
https://www.tubemonger.com/LORENZ_Stuttgart_PCC88_7DJ8_Gray_Shield_Germany_II_p/1054b.htm
I think you’ll have to call a tube dealer to get an answer. Let us know if you get one.
"The next structure up is the unique one it’s a horizontal, circular, metal disc supported by two metal bars. I’ve seen & heard this referred to as a shield or a splatter shield. Which name is correct & what is the purpose of this structure? I don’t know, but most all early 6DJ8 family tubes have it."
https://www.audioasylum.com/scripts/d.pl?audio/faq/joes-tubes.html#6DJ8
and this out-of-stock tube on Tubemonger’s site:
"LORENZ Stuttgart PCC88 7DJ8 SINGLE TUBES Gray Shield 1960s MINT NOS OEM NO LABEL - Getter Ring Fused with Splatter Shield Construction - Made in Germany"
https://www.tubemonger.com/LORENZ_Stuttgart_PCC88_7DJ8_Gray_Shield_Germany_II_p/1054b.htm
I think you’ll have to call a tube dealer to get an answer. Let us know if you get one.