In the late 50's and early 60's, many tube radio manufacturers experimented with new ways to project sound from their devices. All in an attempt to stand out from their competition, and create more pleasing and rich audio experiences. Some systems got it right, and some ... well, let's just say they made notable efforts. This Graetz Melodia model offered an innovation which they called 'Raumklang' and which used a 'Schallkompressor' - a sound compressor - to project the sound around an entire room. It looks like a weird piping system that you'd expect to feel hot air being jetted out from spaced holes along its length, but at this stage I cannot really attest to its efficacy (or otherwise) as it's not yet been restored and tested by myself. I must admit that this feature was one of the reasons that I decided to acquire and restore this model, because curiosity is a fundamental element of my reason for loving this hobby. If you're also curious, stick around for this project and find out for yourself. You can now support the channel: https://www.patreon.com/mcaldeira https://paypal.me/macaldeira Other channels mentioned in this video: @DavidTipton101 #tuberadios #antiqueradio #radiorestoration ______HUNDREDS OF OTHER VIDEOS TO CHOOSE FROM_____ DIY TEST GEAR: The title says it all: https://www.youtube.com/watch?v=7buNHf6HoDw&list=PLy5M_tA9ux7KkjmWX0I0zNocg6NF33EfL RESTORATION BUILDING BLOCKS: A series of videos showing detailed steps used the restoration process of tube equipment: https://www.youtube.com/watch?v=7xvTGd4ysRE&list=PLy5M_tA9ux7JSYx8z2mw303vx287LHpzf HowTo's: Various videos on some simple techniques and projects: https://www.youtube.com/watch?v=lgr-J_D6pSU&list=PLy5M_tA9ux7K3B77iUGyLPai3RIvJOrkO See also playlists on some other completed restoration projects. PHILIPS BX750A: https://www.youtube.com/watch?v=i8U9Lteja5o&list=PLy5M_tA9ux7IG6XgctidGO0u0DeT3_CxF TELEFUNKEN OPUS 2114: https://www.youtube.com/watch?v=_HO2bjY5vuw&list=PLy5M_tA9ux7LhcZ9h9plfTFmjaM1mcifu SABA UW-175-Z 3D: https://www.youtube.com/watch?v=cca4i60ZLw4&list=PLy5M_tA9ux7IWL18nsrSf4RnjsuPjHC-p GRUNDIG 1070: https://www.youtube.com/watch?v=i4J5l0fwhko&list=PLy5M_tA9ux7JgnyYPRWOK763aJ8bg3iCI SCHAUB-LORENZ GOLDY 58 type 3020: https://www.youtube.com/watch?v=RSbt7qVed78&list=PLy5M_tA9ux7IBse5G--Kl89SPS9sATXfZ BUSH VHF64: https://www.youtube.com/watch?v=U--6JymkQ1M&list=PLy5M_tA9ux7KsvN5M48cX6cxN4jSz0s3X GRUNDIG 3060A: https://www.youtube.com/watch?v=7x2sK2GSYeE&list=PLy5M_tA9ux7L8e9h8lrHGREPqcgWO-YQm TELEFUNKEN OPERETTE 8: https://www.youtube.com/watch?v=5IsACM0mPzs&list=PLy5M_tA9ux7K3SXDv8Hu4uAyl1O7NE5dc GRAETZ SUPER 171W: https://www.youtube.com/watch?v=MhG-CH0gqm4&list=PLy5M_tA9ux7IjUykGE8neJSI6GUxMl2YG LOEWE-OPTA MAGNET 3737W: https://www.youtube.com/watch?v=ZSZBJ5sKQm8&list=PLy5M_tA9ux7J_hzDhnF8rs2c7wmgGfRlK BRAUN ATELIER 3: https://www.youtube.com/playlist?list=PLy5M_tA9ux7L3k5nPRvrk1aH764QRCTqE LOEWE-OPTA TRUXA STEREO 4741W: https://www.youtube.com/playlist?list=PLy5M_tA9ux7KhVk0KqPx0Wkh2KO_5f2fQ GRAETZ COMEDIA 616: https://www.youtube.com/watch?v=fwmW9k3TwNE&list=PLy5M_tA9ux7L5sAApLzV6xoYzmRNJpMW5 SABA FREIBURG W2: https://www.youtube.com/playlist?list=PLy5M_tA9ux7IqvS-LshUGpE1D_WY6mrZe GRAETZ MUSICA 4R417: https://www.youtube.com/playlist?list=PLy5M_tA9ux7Ios98E59dWjwc2SRJyxwIn You may also be interested in ... CAPACITOR LEAKAGE TESTER: https://www.youtube.com/watch?v=0pySErvzUIY&list=PLy5M_tA9ux7KWexvEjLB0SANSxQXi0zTS ... https://www.youtube.com/watch?v=Ppt7w4cwqJU

Only $5 for 10 PCBs and every new member get $5 bonus. + Express 24 hour / 48 hour service on https://www.pcbway.com/ After the error that I detected in the previous PCB's that I designed (all my mistake, not the supplier's fault), I ordered new PCB's from PCBWay and re-built the capacitor leakage tester to fit under the shelf of my workbench. The results is far better than I expected, and this device, like it's original predecessor, will come into very regular use. I hope you enjoy the project, and I encourage you to build your own. IF YOU WANT TO BUILD IT YOURSELF ... Below are various links to pertinent information, including a Google Drive folder that has the info on the project in support of the video. Feel free to download it and use it for your personal builds, but please note that I won't be able to provide too much further help with building your project, as time is always scarce. This project is definitely not for beginners, so only embark on it if you are confident that you can do so safely. If you do, you are obviously doing so at your own risk. The PCB's can be ordered directly from PCBWay via the link below. If you prefer, you can use the Gerber files included in the info folder to produce your PCB's elsewhere. Schematic & Gerbers https://drive.google.com/drive/folders/1sxGnUVc_3p2kmEsl8otx2GP2z4UvN3tD?usp=share_link Link to Shared Project section on PCBWay's website for this PCB: https://www.pcbway.com/project/shareproject/EO_N_CAPACITOR_LEAKAGE_TESTER_0b3de257.html You can now support the channel: https://www.patreon.com/mcaldeira https://paypal.me/macaldeira ______HUNDREDS OF OTHER VIDEOS TO CHOOSE FROM_____ DIY TEST GEAR: The title says it all: https://www.youtube.com/watch?v=7buNHf6HoDw&list=PLy5M_tA9ux7KkjmWX0I0zNocg6NF33EfL RESTORATION BUILDING BLOCKS: A series of videos showing detailed steps used the restoration process of tube equipment: https://www.youtube.com/watch?v=7xvTGd4ysRE&list=PLy5M_tA9ux7JSYx8z2mw303vx287LHpzf HowTo's: Various videos on some simple techniques and projects: https://www.youtube.com/watch?v=lgr-J_D6pSU&list=PLy5M_tA9ux7K3B77iUGyLPai3RIvJOrkO See also playlists on some other completed restoration projects. PHILIPS BX750A: https://www.youtube.com/watch?v=i8U9Lteja5o&list=PLy5M_tA9ux7IG6XgctidGO0u0DeT3_CxF TELEFUNKEN OPUS 2114: https://www.youtube.com/watch?v=_HO2bjY5vuw&list=PLy5M_tA9ux7LhcZ9h9plfTFmjaM1mcifu SABA UW-175-Z 3D: https://www.youtube.com/watch?v=cca4i60ZLw4&list=PLy5M_tA9ux7IWL18nsrSf4RnjsuPjHC-p GRUNDIG 1070: https://www.youtube.com/watch?v=i4J5l0fwhko&list=PLy5M_tA9ux7JgnyYPRWOK763aJ8bg3iCI SCHAUB-LORENZ GOLDY 58 type 3020: https://www.youtube.com/watch?v=RSbt7qVed78&list=PLy5M_tA9ux7IBse5G--Kl89SPS9sATXfZ BUSH VHF64: https://www.youtube.com/watch?v=U--6JymkQ1M&list=PLy5M_tA9ux7KsvN5M48cX6cxN4jSz0s3X GRUNDIG 3060A: https://www.youtube.com/watch?v=7x2sK2GSYeE&list=PLy5M_tA9ux7L8e9h8lrHGREPqcgWO-YQm TELEFUNKEN OPERETTE 8: https://www.youtube.com/watch?v=5IsACM0mPzs&list=PLy5M_tA9ux7K3SXDv8Hu4uAyl1O7NE5dc GRAETZ SUPER 171W: https://www.youtube.com/watch?v=MhG-CH0gqm4&list=PLy5M_tA9ux7IjUykGE8neJSI6GUxMl2YG LOEWE-OPTA MAGNET 3737W: https://www.youtube.com/watch?v=ZSZBJ5sKQm8&list=PLy5M_tA9ux7J_hzDhnF8rs2c7wmgGfRlK BRAUN ATELIER 3: https://www.youtube.com/playlist?list=PLy5M_tA9ux7L3k5nPRvrk1aH764QRCTqE LOEWE-OPTA TRUXA STEREO 4741W: https://www.youtube.com/playlist?list=PLy5M_tA9ux7KhVk0KqPx0Wkh2KO_5f2fQ GRAETZ COMEDIA 616: https://www.youtube.com/watch?v=fwmW9k3TwNE&list=PLy5M_tA9ux7L5sAApLzV6xoYzmRNJpMW5 SABA FREIBURG W2: https://www.youtube.com/playlist?list=PLy5M_tA9ux7IqvS-LshUGpE1D_WY6mrZe GRAETZ MUSICA 4R417: https://www.youtube.com/playlist?list=PLy5M_tA9ux7Ios98E59dWjwc2SRJyxwIn You may also be interested in ... CAPACITOR LEAKAGE TESTER: https://www.youtube.com/watch?v=0pySErvzUIY&list=PLy5M_tA9ux7KWexvEjLB0SANSxQXi0zTS #tuberadios #radiorestoration ... https://www.youtube.com/watch?v=Y6Pme3P_F90

The FM on Telefunken Opus tube radios is amazing when it works as it was designed to do. When there is a problem, however, finding it can be challenging. If you need to actually open up the FM front end, you may well be opening up a can or worms. When the 'fault' is something that you yourself imagine, that becomes another issue. Just as time-consuming to solve, but more self-discrimination than technical skill is needed. Enjoy my pain, and avoid yours. You can now support the channel: https://www.patreon.com/mcaldeira https://paypal.me/macaldeira TimeStamps 00:00 FM made me feel stupid ... but I won! Telefunken Opus 8 restoration pt. 4 00:10 Intro. 01:19 Changing discriminator capacitor. 04:44 The checking that was done. 07:33 Testing FM. We have a problem. 11:42 The moment of enlightenment. 12:43 What did I do? 17:43 IF alignment of the FM. 28:58 Testing after alignment. 29:54 Replacement of magic eye tube. 30:27 Conclusion. ______HUNDREDS OF OTHER VIDEOS TO CHOOSE FROM_____ DIY TEST GEAR: The title says it all: https://www.youtube.com/watch?v=7buNHf6HoDw&list=PLy5M_tA9ux7KkjmWX0I0zNocg6NF33EfL RESTORATION BUILDING BLOCKS: A series of videos showing detailed steps used the restoration process of tube equipment: https://www.youtube.com/watch?v=7xvTGd4ysRE&list=PLy5M_tA9ux7JSYx8z2mw303vx287LHpzf HowTo's: Various videos on some simple techniques and projects: https://www.youtube.com/watch?v=lgr-J_D6pSU&list=PLy5M_tA9ux7K3B77iUGyLPai3RIvJOrkO See also playlists on some other completed restoration projects. PHILIPS BX750A: https://www.youtube.com/watch?v=i8U9Lteja5o&list=PLy5M_tA9ux7IG6XgctidGO0u0DeT3_CxF TELEFUNKEN OPUS 2114: https://www.youtube.com/watch?v=_HO2bjY5vuw&list=PLy5M_tA9ux7LhcZ9h9plfTFmjaM1mcifu SABA UW-175-Z 3D: https://www.youtube.com/watch?v=cca4i60ZLw4&list=PLy5M_tA9ux7IWL18nsrSf4RnjsuPjHC-p GRUNDIG 1070: https://www.youtube.com/watch?v=i4J5l0fwhko&list=PLy5M_tA9ux7JgnyYPRWOK763aJ8bg3iCI SCHAUB-LORENZ GOLDY 58 type 3020: https://www.youtube.com/watch?v=RSbt7qVed78&list=PLy5M_tA9ux7IBse5G--Kl89SPS9sATXfZ BUSH VHF64: https://www.youtube.com/watch?v=U--6JymkQ1M&list=PLy5M_tA9ux7KsvN5M48cX6cxN4jSz0s3X GRUNDIG 3060A: https://www.youtube.com/watch?v=7x2sK2GSYeE&list=PLy5M_tA9ux7L8e9h8lrHGREPqcgWO-YQm TELEFUNKEN OPERETTE 8: https://www.youtube.com/watch?v=5IsACM0mPzs&list=PLy5M_tA9ux7K3SXDv8Hu4uAyl1O7NE5dc GRAETZ SUPER 171W: https://www.youtube.com/watch?v=MhG-CH0gqm4&list=PLy5M_tA9ux7IjUykGE8neJSI6GUxMl2YG LOEWE-OPTA MAGNET 3737W: https://www.youtube.com/watch?v=ZSZBJ5sKQm8&list=PLy5M_tA9ux7J_hzDhnF8rs2c7wmgGfRlK BRAUN ATELIER 3: https://www.youtube.com/playlist?list=PLy5M_tA9ux7L3k5nPRvrk1aH764QRCTqE LOEWE-OPTA TRUXA STEREO 4741W: https://www.youtube.com/playlist?list=PLy5M_tA9ux7KhVk0KqPx0Wkh2KO_5f2fQ GRAETZ COMEDIA 616 ... https://www.youtube.com/watch?v=OwGeGvtuAew

Grundig 1070 tube radio restoration log part 3. The audio stages are done, and its time to test them. The audio preamp and power amp now seem to be working just perfectly. Also a discrepancy in component values reares its ugly head. You can see the complete playlist for this restoration at: https://www.youtube.com/watch?v=i4J5l0fwhko&list=PLy5M_tA9ux7JgnyYPRWOK763aJ8bg3iCI All info on this model at: http://www.radiomuseum.org/r/grundig_musikgeraet_1070.html See a series of 'Restoration Building Blocks' videos on detailed steps in the restoration process: https://www.youtube.com/watch?v=7xvTGd4ysRE&list=PLy5M_tA9ux7JSYx8z2mw303vx287LHpzf See also playlists on some other completed restoration projects. BUSH VHF64 tube radio: https://www.youtube.com/watch?v=U--6JymkQ1M&list=PLy5M_tA9ux7KsvN5M48cX6cxN4jSz0s3X GRUNDIG 3060A: https://www.youtube.com/watch?v=7x2sK2GSYeE&list=PLy5M_tA9ux7L8e9h8lrHGREPqcgWO-YQm TELEFUNKEN OPERETTE 8: https://www.youtube.com/watch?v=5IsACM0mPzs&list=PLy5M_tA9ux7K3SXDv8Hu4uAyl1O7NE5dc GRAETZ SUPER 171W: https://www.youtube.com/watch?v=MhG-CH0gqm4&list=PLy5M_tA9ux7IjUykGE8neJSI6GUxMl2YG LOEWE-OPTA MAGNET 3737W: https://www.youtube.com/watch?v=ZSZBJ5sKQm8&list=PLy5M_tA9ux7J_hzDhnF8rs2c7wmgGfRlK Braun Atelier 3: https://www.youtube.com/playlist?list=PLy5M_tA9ux7L3k5nPRvrk1aH764QRCTqE LOEWE-OPTA TRUXA STEREO 4741W: https://www.youtube.com/playlist?list=PLy5M_tA9ux7KhVk0KqPx0Wkh2KO_5f2fQ GRAETZ COMEDIA 616: https://www.youtube.com/watch?v=fwmW9k3TwNE&list=PLy5M_tA9ux7L5sAApLzV6xoYzmRNJpMW5 SABA FREIBURG W2: https://www.youtube.com/playlist?list=PLy5M_tA9ux7IqvS-LshUGpE1D_WY6mrZe GRAETZ MUSICA 4R417: https://www.youtube.com/playlist?list=PLy5M_tA9ux7Ios98E59dWjwc2SRJyxwIn You may also be interested in ... CAPACITOR LEAKAGE TESTER: https://www.youtube.com/watch?v=0pySErvzUIY&list=PLy5M_tA9ux7KWexvEjLB0SANSxQXi0zTS ... https://www.youtube.com/watch?v=0_7vidF3FII