Great, I didn't know those tools existed! I found similar ones at Amazon: https://www.amazon.com/gp/aw/d/B01MXZGE ... PVSY&psc=1pixelpusher wrote: 19 Jan 2026 21:36 These are isolated plastic tools of different length - example about 30 cm - used for adjustment (of potentiometers/variable coils) in CRT's - mine being more than 40 years old, so I don't have a link where to find them :))
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I didn't touch the the RGB drive/cut off controls mentioned in the service manual (as at that point you'd need a good test pattern and colorimeter; they give a x,y white point to adjust for as well as instructions for adjusting the convergence, but that wasn't a road I was comfortable to take).
With an Apple IIgs RGB CRT monitor for comparison as well as a sRGB calibrated LCD (with SCART input) and several sample images I knew which brightness I had to achieve (and which colors were much too dark with the original setting of the SC1224).
I'm asking bacause I have multiple CRTs (Atari SC1425, Commodore 1084S-P1) that I recapped but still need adjustments. I do have a basic pattern generator, a scope, a very basic signal generator and a colorimeter. I do think I really need to do the official calibration process, judging the picture. It's not just brightness and color correctness, there's more aspects to the picture that seem wrong and I can imagine that electronically, there can also be things going on that would overly stress components for example, if not properly adjusted.
I remember blowing up my old SM124 after making the picture a bit larger using the trim pots.