1950 Philharmonic 8200 Audio Issues

[vortalexfan]

Originally Posted by JohnCT

Just to be clear, when you lost the picture and sound, you were left with a blank raster with no snow, correct?

Sometimes we get lost trying to find a problem because of *too much* knowledge.

I would forget about the slipped screwdriver and troubleshoot this like it came in to my shop with no sound and no picture, so that means verifying all voltages in the tuner and IF section, and trying some tubes. Tubes become shock sensitive at times. Maybe the slipped screwdriver caused an overvoltage in one of your tube elements.

Since you seem to have a whole bag of what seem to be unrelated issues, I would again check the power supply voltages and scope them to make sure they're clean.

John

The picture went to a black blank screen, and no audio.

There are a couple of the Video IF tubes in the TV that are original to the set (they were Meck branded because they made the TV for Philharmonic).

Maybe I should try checking those tubes and replacing them with new ones?

Also I don't really have any 6AU6 tubes except what came with this tv, I do have some 6BA6 tubes which are listed as appropriate substitutes for the 6AU6.