Quote:
Originally Posted by dtvmcdonald
Looked at at the video output of the Marconi, the next to highest two frequency bars are perfect, the third at about 75% amplitude, the fourth
at about 35% amplitude, and the last bar shows only spikes at the start and finish.
On the screen, at a bit reduced brightness, the first two bars are perfect, the third quite clear, and the last two show no modulation at all.
The CRT is quite bright, but at turnon, before sweep starts and the focus is
good, shows signs of less than first rate splotches on the cathode surface.
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I should say that the alignment instructions in the EMI service manual should just be regarded as a starting point. I spent many happy hours making tiny changes whilst monitoring the effect on the television screen. After a while you learn which trimmers do what iterating to get the best bandwidth and step response.
Before I switch off the set I have always turned the brightness to minimum and have not turned it up again at switch on until I hear that the sound section has woken up.
Peter