Should you be interested, here are some links: Update: Part II(Triode vs Pentode Input 1 vs 2) and Part III (Small Loudspeaker Matching) and Part IV (Input 2 mod) have been published.īeing a long time Elekit fan, I own many of their products and have written a lot about their more recent offerings in my Blog. Author says ANY triode should be workable.Click pics to enlarge. The Mighty Midget - A 10-Watter for 80 and 40Ģ watts on 16, 80, or 40 with a 45 or 10 tubeġ - Röhren - 5 Watt - Telegraphie - Senderīased on 1-tube German WWII spy radio. This is dangerous - at least put in an isolation transformer. Pair of 45's in push-pull.ĭesigner advises that frequency "warbles" if antenna swings in a breeze. "Tuned-plate-not-tuned-grid" transmitter from 1930 ARRL Handbook. Single 10 Shunt Fed Hartley Oscillator for 80 meter CWįirst project on the page. "Basically, a magnetorn is a 4 Kv Zener Diode, so you need a constant current source". A good starting point.Įxtensive construction discussion and pictures. For physics experiments, not specifically communication.įrom Frank Harris, Chapter 14.
See links to photos, circuit explanation at Over half the parts are the power supply. Used in their Tesla experimentsįor 80, 40 and 15. Scroll down about 1/3 the way through the page Change " Change "gbtx01.htm", to "gbtx01.jpg" to "txosc1.jpg", and "gb12gbt.jpg" Use an isolation transformer, please! This circuit is a dangerous way to save money on parts. This looks like a different approachĬhapter from the Radio Handbook of, apparently, the 1930's "Exciters and Low Powered Transmitters" But very nice history of how it the rig came to be with the help of many others. "Some of feedback capacitance is supplied by tube itself, thus why it appears to be missing something." Check out photo at Author modifies a Radiomann to be an CW Transmitter. Title refers to "the Queen of Induction Coils". This looks like a perfect approach for first-time builders. See towards the bottom of the page for the schematic The Novice Special: An Old Classic Revisited One of those hand-drawn schematics partly in Japanese but readable Looks like a Tuna Tube, but with a Compactron. QRP 30m/40m Transmitter using 12BH7A Push Pullĥ0 Mw output with 50 volts on the plate. No schematics, but you can figure them out
#2 watt push pull diy 12ax7 6aq5 tube amp manual#
In Portugese, from Brazilian manual apparently. K1BSX version of Hartley 1929 Type Transmitterįrom the 1929 article in QST on Hartley oscillators. Nice, fresh approach to tube breadboarding Note the 19V on the plate.Ī 1929 article on "overhauling the transmitter for 1929". I'm guessing at the tube.įrom the Radio Handbook (which is quite worth buying) Notice the connections are strips of, I guess, brass. You can probably figure out the schematic from the picture.
OK, it is not a tube rig, but my idea is to do a tube-based version (except for the Gunn diode) Looks more like 100 MW would be possible with 12V on the plate. I'm not sure if that's the real power figure. I threw this in because I was wondering what it would take to do a tube rig based on one of these. Not a tube rig, but even more primitive, so it's included here. I can accomplish the same thing by turning the rheostat in my dining room on and off.įive parts? I wonder what this sounds like. Maybe you could get away with this as an experiment. 1/3 way down page, section beginning "Funksender". Regenerative receiver with 12AX7 and 6AQ5 In a half-understood language, I use Google's translation page. The pages are in other languages, particularly German. I've tried to list links where there is (1) a picture, and (2) a schematic.