![]() ![]() Now I have checked the manual and in the calibration procedure there's this variable capacitor that is meant exactly for this kind of adjustment but the trouble is that the result is minimal, about one microdivision extension. ![]() If I crank the CRT I get more dim signal on the left side but the rest of the signal is so bright that it annoys me. The problem is that I don't know where the trace starts. It doesn't end sharply as it does on slower sweeps. Starting from about 5uS to 0.005uS sweep speeds the horizontal line starts to shrink from both sides, and on the left side I get a kind of faded out signal/line (depending on the coupling state). Anyway, I could live with that but the next problem I faced is even worse: One is that the horizontal line (while GND coupled) extends to the right outside the area of display and there's nothing that can be done to adjust that (besides messing with X1 gain ) That's kind of bad as I like my signal to end at the last vertical line on the display. ![]() Power supply right on spot.Īfter everything was done I still noticed that I haven't fixed two annoying issues. I got it right on the 4th attempt when I understood how each adjustment interacts with the other.Īlso I've taken my time while constructing a HV divider for the -2450V for CRTĮverything is in spec, some 20 odd mV ripple on the 110V line but nothing else. Opened it up and started twisting the pots It was out of calibration so I started looking in the manual. Very good cosmetic condition, nothing broken even a few extras like original operating manual and service manual (like new condition, from 1978!), an optional blue screen, another wire mesh screen for mechanical protection of the display, frontal case for protection etc. ![]() I just got a Tektronix 465 (simple, no B or M) oscilloscope off ebay about 2 weeks ago (~100$) and I was very happy that it worked out of the box with no issue. ![]()
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January 2023
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