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He tested all the tubes first, and found a shorted cap? I would not have spent time testing tubes that could not cause the problem. That would have been a waste of time as far as trouble shooting a power supply issue such as a small raster. He also would not have found a shorted cap by testing the tubes. The cap probably would not have been shorted, but leaky. This would load down the power supply and cause low B+ voltage. This would cause a small picture. A dead 5U4 would cause a dead set.
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