Problems with a Philco 5 tube radio

[tgunner]

I'm repairing one like this as a gift for someone, and I've run into a strange problem. Well first, I replaced all of the electrolytic's, including a bumblebee, and the C2 cap on the tuner. After this, the set would work faintly but then fade out. I found the 12BE6 tube to be the culprit and replaced it; no more fading after being on. Now the only way I can get good sound and reception from the radio is to use my fingers to bridge the chassis to the C-1A terminal on the tuner. The C-21 part is a mini-tuning capacitor for a "Special Services" station at about 3.2Mhz. Any ideas what could be wrong, or what I could do?

Update: I replaced another cap, C20 a .1uf flat plastic job which connected the B- to the chassis. Now, simply touching the C-1A terminal results in the best sound and reception. Whether or not the loop antenna is connected (where L2 meets the tuner) seems to not matter. Connecting the loop to the C-1A terminal sounds like it overloads the signal.