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Random tube scope screenshot

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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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