Tektronix 2235 Oscilloscope Restoration

>> YOUR LINK HERE: ___ http://youtube.com/watch?v=lrXCVg6T-ek

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)

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