Quote:
Originally Posted by dtvmcdonald
W1 and W2 look correct. The sync pulses are negative going on W1,
and therefore on CRT grids. So note, of course, that only W1 is triggered
on sync pulses.
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Two Points:
Back when I started the CT-100 site in June 1999, the first person restoring a CT-100 to respond to the site emailed that the first two waveforms were reversed. I noted that on page 3 of my folder. That was 18-years-ago this July. Back in 2005, when I got a CTC2 up and running, I recall checking the waveforms and not disagreeing with the info. But, Doug's post puts the question on the table again, so let's see what happens...
And the second point.
I don't have a working CTC2 chassis just now, so I can't check anything out, but on March 15, 2015, I added "Really ?" to W29 on page 3 of SAMS Set 252 Folder 11. Here's my reasoning which tentatively concluded that W29 was 'probably/certainly' not correct.
Checking the I-channel Inverter waveforms, it shows that W31 (grid), W32 (cathode), and W33 (plate) all display I-signal waveforms.
The equivalent Q-channel waveforms show that, of the three -- W29 (grid), W35 (cathode), and W34 (plate) -- only W35 and W34 display Q-signal waveforms. W29 shows a pulse. Somehow SAMS turned a pulse into a Q waveform. History: I knew the guy who set up the SAMS 'production line', as he called it, the one that produced data for the Photofact Folders. He was a publisher, not a technical guy, but I know he'd have been on top of apparent mistakes like this -- keeping such things from being repeated.