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Basic TV safety (maybe we should have sticky for this, guys?)
* If it's not line isolated - use an isolation transformer!
* Watch the CRT - the neck is fragile and old CRTs don't have the safety feature of new ones - glass can really fly if they pop.
* The high voltage 'suction cup' and horizontal sweep section - nasty when on, can hold a bad charge when off. Once unplugged, a screwdriver grounded to the chassis can be slipped under there, it'll make a little *pop* then it's safer. Touch under the cup and any other points in the HV box before going in there.
* NEVER measure the horizontal output tube plate voltage - there's a multi thousand volt pulse present on it.
* Don't try to look in the dark to see if the 1B3 lights up. It doesn't. Yours is fine.
* The vertical section may operate at elevated voltages, also.
* Be wary of electrolytic cans mounted on insulating wafer mounts - they may be at higher than ground voltage. Maybe they had a cover, maybe they didn't.
* Some CRTs have metal cones. The cone will be at high voltage while the set is operating. Even with an insulation apron over it, avoid touching.
* The insulation on the HV lead, and in the HV box won't prevent a shock. Just don't touch those areas!
* The 'lower' B+ voltages can have upwards of 1/2 an amp to back them up! They're just as nasty as the high voltage.
As always, the safest route is to turn off, unplug, and touch a grounded screwdriver lightly around the areas where you'll be working. Some sets can work with the horizontal output tube pulled out (or the fuse removed), but not all. This reduces the high voltage danger from the sweep sections greatly.
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