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Random tube scope screenshot
Alex Eisenhut:
No reason, I was just playing around with my NTSC test signal generator and my Amiga monitor when I got the urge to see the NTSC colorburst.
The upper waveform is NTSC video with a highlighted colorburst, and the lower trace is the expanded view.
That's the B intensified by A alternate mode, and a big old 10 turn pot sets the intensified area.
I just think it's cool, and it does help heat the place a bit as winter winds down...
PwrElectronics:
Nice :-+
I also have a 547 and a 1A4 in my collection. 547 not working and went to cold storage though. 1A4 was working last I know but has broken plastic coupler things on some of the pot shafts inside.
David Hess:
The 547 was the last "fast" oscilloscope from Tektronix which did not use scan expansion, so it produces a sharper display than later instruments. TV production businesses kept them in service long after they were obsolete because of this.
basinstreetdesign:
I have the same scope and a calibrated NTSC test-signal generator as well (Leitch CTG-210). I sometimes make the same display just for old times sake. But I do not have the 1A4 and wish I did.
vk6zgo:
--- Quote from: Alex Eisenhut on February 12, 2023, 01:47:31 am ---No reason, I was just playing around with my NTSC test signal generator and my Amiga monitor when I got the urge to see the NTSC colorburst.
The upper waveform is NTSC video with a highlighted colorburst, and the lower trace is the expanded view.
That's the B intensified by A alternate mode, and a big old 10 turn pot sets the intensified area.
I just think it's cool, and it does help heat the place a bit as winter winds down...
--- End quote ---
That is the sort of display that early DSOs tried to reproduce, failing miserably in the attempt.
A lot of previously "digital friendly" Techs & EEs in the TV Industry were put off by their disappointing performance on standard video signals, compared to even the earlier generations of analog instruments, such as the 547.
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