[Milsurplus] RBM HF Receiver Help Needed

[Joe Connor]

I just finished my MF RBM receiver and it's working great. I just started the HF receiver and need some help. 
R-505 (the RF plate filter resistor) is smoking. I go to the plate of the RF tube and measure resistance. It's supposed to be 18.5K but I'm getting a dead short.
I disconnect the lead from R-505 that goes into T-502 (the RF assembly). Now I've got B+ on R-505. I disconnect the lead from T-502 to the plate of the first RF tube so that T-502 is completely out of the circuit, and test T-502: it reads a dead short, so it seems like the RF assembly is shorted. A likely suspect is C-518, a .02 paper cap that bypasses the RF plate, but that cap is inside T-502.
Does anyone know how to get into T-502 or how to drop the box? I just don't see any way to do it. 
Failing that, can I bypass the RF stage and, if so, how? Any other ideas of what might be shorted?
As always, thank you for your help.
http://www.virhistory.com/navy/rcvrs/ww2/rbm/RBM5_HF-schem.pdf

Joe Connor
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