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Tektronix 2235 Oscilloscope Restoration

In this video, I restore a Tektronix 2235 analogue oscilloscope. Below is all the details of the obscure parts I used: Schematics and documents: https://drive.google.com/open?id=1L2p... Digikey Parts List: https://www.digikey.com/short/zf0m5b TekWiki link: http://w140.com/tekwiki/wiki/2235 Details on parts substitutions: Full capacitor replacement. Swapped like for like, except. Two tantalums on the attenuator board were upgraded to 50V. PSU output caps were upgraded to 1000uF. The large silver 450V 75uF cap was upgraded to 120uF. Replaced Rifa mains caps with new x/y class caps. Installed 60mm fan, swapped the 20ohm resistor to 10ohm to increase fan speed slightly. Replaced R888 - R892, R894 with new Metal film Vishay HVR series 1/2W 510Kohm. Performed Service update 050-2242-03 with the following details: 119-3511-00 Diode-Resistor network built from an 1N4148 and 10ohm 1/4w resistor in series, cathode of diode away from resistor. 151-0565-00 substituted with S4010LS2TP (original part in my scope was a C106B2). 151-0852-00 substituted with TIP41C (original part in my scope was 476-02). 151-1245-00 substituted with IRFBC40LCPBF (original part in my scope was an IRF710 by International Rectifier). 307-0456-00 substituted with V250LA20AP (original part in my scope was V250LA15A)