Replace Selenium Rectifier with Silicon Diodes & MOSFET Voltage Dropper in Tube Radios #pcbway#

Only $5 for 10 PCBs and every new member get $5 bonus. + Express 24 hour / 48 hour service on https://www.pcbway.com/ ➠ ➠ ➠ In this video, I’ll show you how to replace the selenium rectifier in vintage tube radios with modern silicon diodes, while maintaining the proper voltage drop. Since silicon diodes have a lower voltage drop than selenium rectifiers, I’ll be using a MOSFET and a trimmer potentiometer to provide an adjustable voltage drop. This allows you to fine-tune the voltage to match the original circuit specs, ensuring your vintage radio operates smoothly without over-stressing any components. This solution is practical and easy to follow, whether you’re restoring a classic tube radio or simply looking for a modern and safe replacement for the selenium rectifier. NOTES: The Tab of the Mosfet is at the '-' potential, so the bolt connecting it to the PCB and then to the Chassis must be a nylon one if the chassis is not a common GND. Before applying power to the board, set the Trimmer Pot to about half-way to prevent the Mosfet from being OFF when power is applied. This will prevent the circuit from seing the full B+ across it, which may damage the Trimmer Pot. ➠ TO ORDER PCB'S: https://www.pcbway.com/project/sharep... ➠ Links Mentioned in this Video RG Keen's Mosfet Follies: http://www.geofex.com/Article_Folders... 🙏 Want to support the channel? ●●●●●●   / mcaldeira   https://paypal.me/macaldeira #TubeRadioRestoration #SeleniumRectifierReplacement #SiliconDiodeFix ●●●● HUNDREDS OF OTHER VIDEOS TO CHOOSE FROM ●●●● ✿ DIY TEST GEAR: The title says it all:    • Zener Diode Tester - Part 1. The build.   ✿ RESTORATION BUILDING BLOCKS: A series of videos showing detailed steps used the restoration process of tube equipment:    • How to safely check the Power Transformer ...   ✿ HowTo's: Various videos on some simple techniques and projects:    • Extend tube radio FM band above 100MHz wit...   ✿ DIY CAPACITOR LEAKAGE TESTER PROJECT: One of the most viewed projects on my channel, with full design description and build instructions.    • Capacitor leakage tester design & build DI...   ✿ DIY TUBE TESTER PROJECT: Complete design description and build instructions for this really handy device.    • DIY Tube Tester. Working on Power Supply o...   ●●●● Plus full Playlists on some other completed restoration projects on this Channel ●●●● 📻 PHILIPS BX750A:    • Philips BX750A tube radio restoration - Pa...   📻 TELEFUNKEN OPUS 2114:    • Telefunken Opus 2114 stereo tube radio res...   📻 SABA UW-175-Z 3D:    • Saba UW 175-Z 3D tube radio restoration - ...   📻 GRUNDIG 1070:    • Grundig 1070 tube radio restoration - Part...   📻 SCHAUB-LORENZ GOLDY 58 type 3020:    • Schaub-Lorenz Goldy 58 type 3020 tube radi...   📻 BUSH VHF64:    • Bush VHF64 tube radio restoration - Part 1...   📻 GRUNDIG 3060A:    • Grundig 3060a tube radio restoration - Par...   📻 TELEFUNKEN OPERETTE 8:    • Telefunken Operette 8 tube radio restorati...   📻 GRAETZ SUPER 171W:    • Graetz Super 171W tube radio restoration -...   📻 LOEWE-OPTA MAGNET 3737W:    • Loewe-Opta Magnet 3737W tube radio restora...   📻 BRAUN ATELIER 3:    • Braun Atelier 3   📻 LOEWE-OPTA TRUXA STEREO 4741W:    • Loewe-Opta Truxa Stereo 4741W   📻 GRAETZ COMEDIA 616:    • Graetz Comedia 616 tube radio restoration ...   📻 SABA FREIBURG W2:    • Saba Freiburg W2 (WII) restoration   📻 GRAETZ MUSICA 4R417:    • Graetz Musica 4R417 restoration