I found this article in the Lloyds Dipsy Dumpster - site, where you can find a lot of rare vintage radio articles, manuals and data sheets.
It is remarkable, that "Pilot Radio & Tube Corporation", well known as a manufacturer of the great Super-Wasp receivers, was a publisher of a Ham-Radio literature, handbooks and magazines, as well as many of early radio manufacturing companies. As for me, I like that sort of advertising much more, than modern spam in my mailbox and if it would be possible, it should be a nice choice to make this QRP transmitter using a native Pilot's parts only.
Anyway, when I've read this article, one interesting fact has drawn my attention - I can recognize the TNT when I see a TNT design, but in the text this transmitter has been described as a TPTG.. Moreover, there is a grid capacitor on the assembles view, but with a opposite description below: "condenser is not needed". So, in the article we can see that mysterious moment, when as the chrysalis becomes the butterfly, TPTG transmitter was transformed into a trendy TNT.
Yes, Best HOWTO Ever, but not mine - hats off to Steve VE7SL. I've found this great article reading the Glowbugs mail list and I have to post it here because this article is a pure gem. Even if you never did it before, after the reading of this article you can to, you have to make your first TNT or Hartley transmitter and trust me - it is only first steps into the amazing world of glowing history! BUILDING A 1929 VINTAGE TNT TRANSMITTER Quote:
"After some research into the 1929 transmitter style, it became apparent that most amateurs of the period were using either a Tuned-Plate-Tuned-Grid (TPTG), a Hartley oscillator or a Tuned-Not-Tuned (TNT) design. I can well imagine the countless late night 160m AM QSO's of the day discussing and arguing the virtues of each amateur's chosen design. Eventually I decided on the TNT, a simpler off-shoot of the TPTG design."
Several days ago I listened to the completely empty ten meters band. There was a lot of noises, quiet CB chewing and nothing else. Suddenly I heard a slow, quiet, but very clear telegraph code, resembling W1AW QST. I have not heard the beginning, but wrote all heard:
..Santa placed tubes on the sockets and lit it. The soft red glow from its ones tiny heaters brightened the room. "The glow of the valves represents how man can show his thanks for the gift of God's Son that Christmas Eve long ago. Teach the novices to let their lamps shine before men that all may see it and glorify God. This is what is symbolized when the red lights shine on the twilight around the world like hundreds of bright, shining candles, each of them representing one of God's beloved radio amateurs whose signals are sounding for all to hear."
"Yes, red glowing" said Santa, "is the first color of Christmas." He pointed to the Rudolph, Red-Nosed Reindeer. "But the second color is green" Santa reached into his bag and pulled out Magic Eye tube and set it into the socket. "Teach novices about Magic Eye. Green is the second color of Christmas. The stately evergreen with its unchanging color represents the hope of eternal lif.....
At this point I lost to hear mysterious broadcast, only a few dits and dashes appeared in the noise, someone laughed quietly and that's all. But I realized that I have to add something green to my radio. I went to my attic and found a Magic Eye tube in my junk box.
MAGIC EYE TRANSMITTER HOWTO It is easy to install 6E5 on the place of oscillator tube because socket's pinout of this amazing valve is nearly the same to pinout of common 6J5 and 6C5 triodes. So, you can replace these tubes with The Magic Eye without any soldering. But if you want to see The Legendary Green Glowing, you have to apply some voltage to the Pin #6 (fluorescent screen). It will not affect the excitation or amplification, this electrode do not cross the main electronic stream in the tube, so it is unecessary to use a regulated voltage in this circuit. Let me demonstrate:
As you can see this is my last year's SKN MOPA transmitter with some minor changes.
After reading a lot of ancient QSTs, ARRL and Jones Handbooks plus e-mail conversations with my friend, Louis VE3AWA about American depression-era style rig design, I decided to build a classic breadboard transmitter in time for Straight Key Night.
Well, breadboard MOPA seemed like a very interesting idea, it was absolutely unusual for me - I never used wooden chassis (breadboard) without any metal shielding before. Second problem - I'd started this project too late, for only one week before the SKN. To my surprise, I got my firefly finished and fired-up during Straight Key Night! Without any success - there was no SKN participants over here. But what done is done and I was so glad to hear many "loud and clear" signal reports and heartwarming words from EU CW stations. Maybe next SKN, VE and W stations will make a sked to work UU1CC. READ MORE >>
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