75 Ohm switched attenuator, with impedance matching pad.
Only $5 for 10 PCBs and every new member get $5 bonus. + Express 24 hour service on https://www.pcbway.com/ The ELV SUP3 Stereo FM test signal generator is just perfect for aligning my tube radios, but as mentioned previously, the output signal level is a little high and needs some attenuation. It has a 75 Ohm output impedance, and the option to switch to 300 Ohm for tube radios is a good idea. This iteration of the project takes into consideration some suggestions received from viewers, and is a stepped attenuator that can be switched up to 50dB of attenuation, as well as an impedance converter, from 75 to 300 Ohms. The Gerber files will be on the PCBWay share section if you want to order boards for yourself. Hope it proves helpful. You can now support the channel: / mcaldeira https://paypal.me/macaldeira TimeStamps 00:00 75 Ohm switched attenuator, with impedance matching pad. 00:10 Intro. 00:45 The new project version. 04:15 The PCBWAY boards. 07:02 The schematic. 10:53 The calculations. 16:30 Built begins. 18:59 Build done. 20:28 Testing. 30:14 Conclusion. #tuberadios #antiqueradio #radiorestoration _____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... See also playlists on some other completed restoration projects. 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 You may also be interested in ... CAPACITOR LEAKAGE TESTER: • Capacitor leakage tester design & build DI...
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