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Welcome,
Geojunkie,
Welcome aboard and congrats on your first restoration. That arcing in the CRT doesn't sound right. Does the CRT have an ion trap? You may have it set wrong and the beam is burning an oversized beam clearance hole in one of the disc grid elements. Just an idea. If this is so it will not take long to toast your CRT.
I have three different models of those two chassis admirals. Two different wooden case ones from 1947 and the bakelite from '48. Which do you have? 10BP4 CRT right? They are great vintage sets.
Marker signals on sweep generators are generated to place a pip or brightness spot along the sweep at the points in the response curve where the key frequencies are to represent the beginning of the skirts (tapering response at the edge of the passband). This lets you do the alignment with a detector diode probe on an uncalibrated oscilloscope screen.
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