06-13-2012, 11:39 AM
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.