[Hallicrafters] SX-25 (Help Needed Again)

[Joe Connor]

A supposed lack-of-sensitivity problem that has been bothering me from the outset turned out to be an open half of the audio output primary. (Only one 6F6 has plate voltage. A resistance measurment from the center tap to the plate of one 6F6 is 270 ohms while the resistance to the plate of the other 6F6 is infinity). 
 
For a replacement, I'm looking at the HX125D. Here are the specs: http://www.hammondmfg.com/125a.htm Is this a good replacement? I understand that I will be limited to an 8 ohm or 4 ohm speaker but that's fine. For purposes of installing the replacement, what is the primary input impedance of the push-pull 6F6s?
 
By the way, this problem existed when I got the set. I replaced the 'lytics and audio caps (including that 1,600V one across the primary) before I powered the set up. The audio has been the same level and quality since I first tried the set. I discovered the problem tonight only when I measured resistors and checked voltages in the audio section for the first time. 
 
With your help, guys, I think I'm into the home stretch with this receiver. The mechanics of the replacement seem to be pretty straight-forward. I will finish recapping and checking resistors while I wait for the new transformer to arrive. 
 
Again, thank you for all your help!
 
 
                                   Joe Connor