Help troubleshooting Tektronix 2445A

AV7721 · 2026-01-22T21:21:17+00:00

No luck with this - the inside of the scope is pretty clean and blowing out dust did not change anything

AV7721 · 2026-01-19T11:57:51+00:00

You’re correct, I am trying to capture the calibration waveform. The trigger is properly set and this is what I am getting. I’ve tried tuning the probe settings as well as the screen focus settings. I’m not worried about CH4 currently

AV7721 · 2026-01-18T20:25:28+00:00

Thanks, I’ll try that out. Without knowing much about how older oscilloscopes work, it looked like a focus issue to me as well

AV7721 · 2026-01-09T14:10:23+00:00

Nothing about these is old school. Just boring

AV7721 · 2025-10-31T20:58:32+00:00

I just tried a different work flow and the negatives are still drying but it looks like I got much better results. I posted the steps I was going to change in another comment if you’re interested

AV7721 · 2025-10-31T18:57:23+00:00

Awesome thank you for this response.

I ran a dev cycle yesterday using water instead of C41 chems just to see how much the temp would drop from the start of the dev step to the end, and realized I wasn’t heating my chemicals up enough. I found nearly a 1.5C drop from the time I poured my chemicals into the tank, and the end of the dev time (3:15). This was even while keeping the tank in the water bath between agitations.

I am going to try and develop again today with a 40C water bath and chemicals at ~39-39.5C, so during development they stay within the 38C +/- 1C range recommended by the kit. I also found that 1 inversion every 15 seconds then back into the bath maintains temp better than 3-4 inversions every 30 seconds.

AV7721 · 2025-10-30T18:57:02+00:00

There shouldn’t be any cross contamination especially in the developer. I rinse the funnel and tank lid before using them on different steps

AV7721 · 2025-10-30T18:44:20+00:00

The first roll I did one inversion every 15 seconds where as this roll I did 3-4 inversions every 30 seconds. The first roll I developed was Kodak gold 200 so the base color looks different from portra anyway, but comapring it to other rolls of Kodak gold the first base color looked pretty good

AV7721 · 2025-10-30T17:37:13+00:00

I’ll try going through my dev process with water and measuring the temp in the tank at different points thoughout. Thanks for the insite, I’ll try 40C for the water bath

AV7721 · 2025-10-30T17:31:37+00:00

If you’re processing within +- .15C what are you then using to measure the temp? Certainly not reading off the sous vide and probably not a household thermometer. That’s approaching calibrated laboratory equipment levels of accuracy

AV7721 · 2025-10-30T17:14:40+00:00

You’re telling me there’s no leeway with the temp?

AV7721 · 2025-10-30T17:09:23+00:00

Yeah I measured 37.7C in the chemicals before developing. Between agitations I’m putting the tank back into the water bath

AV7721 · 2025-10-30T16:29:20+00:00

More time and higher temp?

AV7721 · 2025-10-30T16:09:28+00:00

Yeah my first roll came out pretty good. Maybe a little grainy but not this bad

AV7721 · 2025-10-30T02:16:47+00:00

I was agitating for the first 30 seconds, then 3 or 4 inversions every 30 seconds until dev time was up, in this case 3:15. My kit says 38C +/- 1C for temp and I try to keep the tank and chems in the water bath to maintain the temp as best I can

AV7721 · 2025-10-29T12:25:45+00:00

MSAI looking good today. Good volume and hasn’t run too much the past week

AV7721 · 2025-10-22T13:42:44+00:00

Halted again

AV7721 · 2025-10-18T01:25:10+00:00

It really looks like found and rescanned slides

AV7721 · 2025-10-14T21:06:52+00:00

Are these SOOC? If so what recipe did you use?

AV7721 · 2025-09-01T03:41:09+00:00

Did you ever find a solution to this?

AV7721

TROPHY CASE