Philco roundie

[DaveWM]

did a front to back ratio check, in circuit, on the AFC diodes using my simpson 260 (like it since it can quickly change polarity), looks ok. They are modern so did not really think they were the problem. Starting to think its going to be the pot, its REAL touchy. there was a 6GH8 in place of the called for 6GM8 in the sync sep circuit. I put in the correct tube but its still touchy, guess the 6GH8 was an acceptable sub. Since its easy to get at, will scope the cathode junction of the horz AFC diodes next just to confirm it getting the correct pulse. I think this set is just going to need a good electrical contact cleaning. all the controls are very noisy and most of the tubes are frozen in the sockets.

Think the only other thing I will check will be the voltages at the CRT, the G2's needed to be maxed out, want to make sure the full boost is avaliable to the adj pots.