Only $5 for 10 PCBs and every new member get $5 bonus. + Express 24 hour / 48 hour service on https://www.pcbway.com/ I have been using JFETs for many years in guitar pedals and effects. Many of my guitarist friends love the smoother distortion that these devices produce, when compared to BJT or op-amp devices. However, my fascination with these components extends further ... they are known to emulate a tube amplification stage quite well, when properly biased and carefully selected. Much has been written about this characteristic, describing their similarities and differences, so my research has been greatly simplified by consulting some incredibly well presented papers on the subject. One site in particular takes this further - Runoffgroove.com. They use the research available to attempt to emulate the front-end of a fender guitar amplifier, and achieve quite amazing results. They call their circuit the Fetzer Valve, and you should really visit their page for a truly amazing description of their design process. They also provide an online calculator that allows you to define the component values for optimal biasing of any particular jfet, after determining its cut-off voltage (or pitch-off voltage), and its Idss, both easy to measure using a simple schematic that they also provide. I list a few of the reference links for your information, and in recognition of the amazing work that their authors have presented to all of us. Hope you enjoy the project. References: https://www.runoffgroove.com/fetzervalve.html https://www.scribd.com/doc/65330169/Triode-Emulator-by-Dimitri-Danyuk https://nexp.pt/triode.html If you would like to have your own PCB's made for this project, the PCBWay share link is: (coming in a day or two) You can now support the channel: https://www.patreon.com/mcaldeira https://paypal.me/macaldeira #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=T6TYR8mUpAI

Philips BX626 tube radio restoration - Part 5 Using today's technology to make these vintage radios more useful is something that really appeals to me, so adding bluetooth is a must, especially in sets that have no FM. Using a simple and cheap bluetooth receiver module and adapting it to supply the phono input with a signal, is actually very simple. I decided to fit this one inside the set and supply it from a readily available source: The heater supply. This video shows the details of just such a mod, and the result is well worth the effort. If nothing else, it makes you look cool to your teenage kids. SUPPLY ISOLATION DEVICE: This component is called a "1W, FIXED INPUT ISOLATED & UNREGULATED SINGLE OUTPUT DC-DC CONVERTER". It is readily available on eBay, just search for "b0505s-1w:. The datasheet is here: https://www.mornsun-power.com/uploads/pdf/B_D-1W.pdf Full info on this radio at: https://www.radiomuseum.org/r/philips_bx626z.html?language_id=2 You can see the playlist for this series restoration at: https://www.youtube.com/watch?v=ivqt5OBex_I&list=PLy5M_tA9ux7K813k81En1mGSyDvS6wQT- 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 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. 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 COM ... https://www.youtube.com/watch?v=NyuGbY8A4b8