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I worked in a large service department at a place
called Economy TV in St Petersburg FL in 1979.
I remember a poor tech that had a bowl full of SG613s
that he had blown troubleshooting one.
After that, no one was allowed to work on one unless he received
theory and training.
I think the circuit was amazing for its time. I unload
the sweep board from the power supply and substitute
2 100W bulbs in series for the load. A nice stout 20v
power supply to get the osc running. No harm done
even if the GCS locks on due to a fault. Just 2 bright bulbs.
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