Quote:
Originally Posted by old_coot88
'Blooming' occurs when the high voltage drops signifigantly. Static attraction from the front of the CRT decreases, allowing sweep angle to increase or "bloom". The raster progressively dims and goes out of focus as it blooms.
The most common cause is a weak HV rectifier. Or excessive CRT beam current can lug the HV supply down (eg., from the brightness control being turned too high).
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I feel like I'm getting off-topic (sorry), but thanks for that explanation. That might actually help me with the blooming on my set. The 1K3 rectifier was dead when I got the set, so I replaced it with a 1B3 I had lying around, thinking it would be 'close enough'. If it's outputting on the weak side, that might explain the weird blooming pattern I've been seeing lately.