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There's a 'quick & dirty' check for identifying a borderline weak tube. It's the "seven seconds off" test. With the set warmed up and showing the fault, turn it off for about 7 seconds, and back on. Is the width slowww to fill back out? That'd indicate a borderline H out tube.
The same test can show up other borderline tubes, e.g., vert out, horiz osc, color 3.58 osc, RF amp etc.
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