07-22-2013, 10:26 PM
I would get another 6A8, I don't know if brand Z ever used 6K8s, the 6A8 is what is known as a pentigrid converter, the 6K8 is a triode-hexode. I've never had a set that used a 6K8 but have heard of some communications sets using them, some RCA sets, along with my Philco 40-180 used a 6J8 which is a triode-heptode, the heptode section has one more grid then a 6K8.
Regards
Arran
Regards
Arran