[Hallicrafters] SX-28A measurement request

[Waldo Magnuson]

Hi,
   I'm back trying to get my second SX-28A operational.  After 5 minutes it blew a fuse.  I pulled the 5Z3 and pin 2 to pin 3 measures 80.1 ohms (schematic value is 78 ohms).  But pin 1 to pin 4 measures infinity (schematic value is 0.1 ohms).  I have a second SX-28A which does play okay and I pulled it's 5Z3 and made the same measurements AND the pin 1 to pin 4 ALSO measures infinity.  I don't understand the schematic and the measurements I made.  If someone has a SX-28A easily accessible would you make the same resistance measurements (no power and 5Z3 pulled of course).  Many thanks.
Skip Magnuson
W7WGM
Spokane, WA