Bun's Lab – Telegram
Bun's Lab
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Electronics projects, vintæg computing, programming and repairs. A minimalist blog of sorts.
@BunsGarden @BunsNook
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Gould Logic Analyzer
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Bun's Lab
Photo
This cable goes to the neck board of the CRT, so there's focus voltage on it.
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The capacitor tests fine, 1uF at 100V can have an ESR of up to 8 Ohm, the legs however look pretty corroded. My first assumption was that electrolyte leaked out and turned the epoxy conductive. That should show in the remaining capacitance and loss however. Maybe the epoxy became conductive enough on its own. There is epoxy that can get corrosive with time. Would explain the legs. Maybe even slightly conductive?
I'll still replace the cap. Only got .47 and 2.2 with at least 100V rating. Don't think it's critical, I'll take the 2.2
The CRT board is a third party daughter board. Computron 115DMX. Those bastards filed off the label of the controller IC
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Black screen. The flyback is running however
The heater is glowing. So I got heater voltage, put the cable in the correct way and didn't neck the tube.

God, how I love CRTs. Little electron particle accelerators <3
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Got a video signal. So what gives?
There we go. Brightness pot slipped a bit during handling of the board lol
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Measuring the voltage at the capacitor: it's just 50V DC. So, using 2.2u is fine
Trying to charge the NiCd battery with my lab supply: nothing. Dead. And I don't have replacements here. So that's gotta wait.