Try reheating the middle legs of each MJE-350.
Since you have appropriate voltages elsewhere, both tubes are "turned on", but I believe you have a flaky solder joint that's preventing the upgrade from working properly.
Also, if you don't pass the voltage checks, NEVER use any of our kits until things are sorted out. Having 0V at those two terminals tells us that there's no sound, there's no need to verify that by putting your other equipment and your safety at risk.
