Starting work on a GE 800 Locomotive.

[Eric H]

I tried the tube again and no vertical, until I whacked it with a screwdriver.

Tested the tube again, very good on both sections and it's a fairly new looking Sylvania.

I tried it in the Horizontal Oscillator circuit and it works fine, in fact I was able to adjust the horizontal down to a single image.

It's an odd looking 12SN7, taller than most and the plates are different than the usual thin, flat ones usually seen, it actually looks more like a 12SL7.

The chassis still has a lot of old caps in it, none of the Electrolytics have been changed yet so it could be the circuit is just being fussy at this point.