Old bench power supply restoration (AUL210 from 1983) part 4

Finally fixing this vintage linear bench power supply (AUL210 made by ZPA Košíře závod Děčín in Czechoslovakia in 1983). It has two adjustable 0-36V 0.2-2A outputs with thyristor (SCR) pre-regulation, two 15V 1A outputs and one 5V 2A output. I found and repaired the problem in the faulty 15V section. I also fixed an unexpected bridge rectifier problem in the other 15V section. Some more electrolytic capacitors tested and replaced. Adjusting the feedback PID to prevent unwanted oscillations. A leaking, shorting and exploding paper capacitor in an interference filter. Some oscilloscope measurements in the thyristor controlled rectifier section that pre-regulates the voltage.

The 1st episode:
https://youtu.be/fRdSxuZ80sY

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Видео Old bench power supply restoration (AUL210 from 1983) part 4 канала DiodeGoneWild