Re: Help needed restoring a Murphy V310
"Ballooning" describes a condition whereby as one advances the brightness or contrast, and thus increases the beam current, the picture on the screen appears to move toward you, increasing in size with the edges disappearing off screen and becoming defocussed.
This is frequently caused by a knackered EHT rectifier.
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Thermionic Emission, warms the cockles of your tubes.
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