Philco Mystery Control Receiver

[ghjkl67]

Anybody here ever work with a Philco mystery control set? Mine is a 39-116. Everything is recapped, but the mystery control receiver/relay section is not functioning normally. Upon activating remotely, the thyratron seems to get stuck in the activated position, magnetizing both relays continuously. Sometimes, the thryraton works normally, but the stations/volume change at random.

Another problem is that the chassis gets hot through 2 line bypass capacitors. I recently disconnected these caps in the meantime since the radio operates the same with or without them, but unusually, the chassis still has a potential of about 70V to the round outlet ground. However, if this hot chassis problem has nothing to do with the mystery control, I don’t want to worry about it.

I’ve been at this thing for over two months. The radio took a couple days to recap and get running, but I have no clue how to go about troubleshooting the remote section. I read the article at philcorepairbench.com but it doesn’t make much sense to me. I’d appreciate it if someone could give me an idea where to go from here.