[sjhs1962]

Seems like the cabinet re-entry process is a touchy process, at least for me with my limited experience. Model 60 was working fine on the outside. Now it is howling and oscillating. Even with tube shields. I am wondering if somehow the 42 tube or the 6A7 tubes are shorting out. Any help would be greatly appreciated. This new problem just cropped up.

[sjhs1962]

Crazy. I pulled the 42 and 6A7 and then reinserted. Radio plays. I am wondering about a loose pin contact or something similar. The radio is in the normal position, not on its side or back. Any thoughts on a hit or miss howling, motorboating, oscillating symptoms. Thanks.

[codefox1]

Sounds like you should clean up the tube pins and sockets with deoxit, you can sweat the pins on the tubes and add a little bit of solder to be sure, retention the contacts of the socket gently with a pick or needle, let everything dry out, and you should be fine.

One more thing, make sure there is nothing hanging down or sagging that will compress to a short when chassis is upright.