IIRC the Sylvania was a D-12. The resistors went between the 250V & 24V.
Caused quite a lot of havoc. Only other shorting resistors I remember were
in GE 18" compactron sets. It was in the video out left rear corner of PCB.
8.2 K 2W IIRC
As far as better tube sets go the first thing I would add is a cooling fan
near the Hoz/HV.
73 Zeno
LFOD !