The repair of a Technics ST-Z45L (circa 1982), tuner. Warning this is for Electronic Engineers and competent technicians only – Very Exposed Mains Voltage! However, I found it a reasonably easy repair and (albeit for another model), managed to find a downloadable circuit diagram. <br />Please note: <br /><br />The 2 Gold Super Caps are connected in series and when fully charged should be about 4.5VDC.<br /><br />My added small heatsink and replacement transistor (Q701), mustn't be physically too high above the board – will short-out when case top is fitted!<br />Links:<br />*ST-Z55 circuit diagram download: <a href="https://elektrotanya.com/keres" target="_blank" rel="nofollow">https://elektrotanya.com/keres</a><br />*Q701 (2SD762) datasheet: <a href="https://alltransistors.com/transistor.php?transistor=20018" target="_blank" rel="nofollow">https://alltransistors.com/transistor.php?transistor=20018</a><br />*TIP41c datasheet: <a href="https://alltransistors.com/transistor.php?transistor=46897" target="_blank" rel="nofollow">https://alltransistors.com/transistor.php?transistor=46897</a><br />*TIP41c, buy (Currently, RS don’t charge P&P - if ordering online): <a href="https://uk.rs-online.com/web/p/bjt-bipolar-transistors/4859812/" target="_blank" rel="nofollow">https://uk.rs-online.com/web/p/bjt-bipolar-transistors/4859812/</a><br />*Gold Cap, buy RS: <a href="https://uk.rs-online.com/web/p/electric-double-layer-capacitors/0572520/" target="_blank" rel="nofollow">https://uk.rs-online.com/web/p/electric-double-layer-capacitors/0572520/</a><br />...<br /><a href="https://www.youtube.com/watch?v=MS32FXfQaJ0" target="_blank" rel="nofollow">https://www.youtube.com/watch?v=MS32FXfQaJ0</a>