Dedicated Website for Audiophile projects, such as a Diy High End DACs, Loudspeakers, Tube Amplifiers – Doede Douma
"At the age of 10 we moved to Copenhagen for about 2 years. I had some friends there who knew that I liked old radios so regularly someone brought me one. (See my picture at the main page) Among them was the Bang & Olufsen - Grand Prix 48 K (photo). I liked this radio so much that I wanted to make it work again. There was not much wrong so I got it working. Later when we were back in Eindhoven, I made so many ......."
Franks Electron tube Pages
More about Frank's Experiments
"Back in Eindhoven, there where the 60's. Radio Luxembourg on my B&O etc. I got interest in guitars and amplifiers. I built several Amps. My first amp was something with the EF11 and the EL3. I also built a copy of the EL6431 Amplifier. (That's where the output transformer of my B&O radio went) In Eindhoven there was a repair shop called 'De Radiodokter'. He had some old TV chassis in the display for 5 guilders each. When I had saved enough money, I bought some. Then when I was about 16 I made my first really working TV from these parts."
Franks Electron tube Pages
- Tube Number Systems
- American Substitutes for Foreign Types
- Foreign Substitutes for American Types
More about Frank's Experiments
"Back in Eindhoven, there where the 60's. Radio Luxembourg on my B&O etc. I got interest in guitars and amplifiers. I built several Amps. My first amp was something with the EF11 and the EL3. I also built a copy of the EL6431 Amplifier. (That's where the output transformer of my B&O radio went) In Eindhoven there was a repair shop called 'De Radiodokter'. He had some old TV chassis in the display for 5 guilders each. When I had saved enough money, I bought some. Then when I was about 16 I made my first really working TV from these parts."
Some Audio and other Articles/Projects on Vacuum Tubes or Valves. Also he has made Online Calculators .. Bias Tool, Gain Tool and Low crossover cap.
Vacuum Tube-G Pages from Peter
Some articles written by Alan Kimmel, as it did in the years 1993 to 2004 on the original Tube Labs.
- The Choke Assisted Mu Stage
- Why use the Kimmel mu stage
- 7 A few variations of the mu-stage
Best of ‘In Practice’ on the web – Articles and resources of long-term interest, including switch-mode power supplies. GM3SEK’s Amateur Radio Technical Notebook which also contains the archives of old Radcom ‘In Practice’ column.
The DG8 – a Low-Cost, High-Performance Masthead Preamp for 2m – by Ian White GM3SEK
A masthead preamplifier is the greatest single improvement you can make to your receiving performance for VHF/UHF DX and contesting. But the preamp MUST be at the masthead for optimum performance, and unfortunately many preamp designs leave the user to provide the necessary RF switching and weatherproofing. ….
The DG8 Masthead Preamp for 2m is designed specifically for outdoor use, close to the antenna.The integrated single-board design avoids the expense of coaxial relays without any significant impact on performance …
Amateur Radio Technical Notebook – GM3SEK
The Triode Board – PC board and Kit for Triode PA control and protection – The Tetrode Boards – PC boards and Kit for Tetrode PA control and protection.
Cost-effective Ferrite Chokes and Baluns
“But remember that an HF ferrite choke will typically need 6-8 turns passing through the centre hole. Regardless of the type of core, one pass through the centre will never be effective at HF!” – GM3SEK
Ronald Dekker's Nixie Tube Projects and Software. He has many interesting projects like "Mixed-Signal" LED clock, The µTracer, a miniature tube curve tracer. A Tiny 80(C)31 Basic Board.