My New 6L6 Transmitter. Carl W. Davis W8WZ. I have always wanted to build my own transmitter. I got my first Amateur Radio License when I was 14 years old. My grandfather was still alive then, and he helped me build a Hartley Oscillator for 20 meter CW operation.
I could tell by the tone of his signal that he was operating a homebrew transmitter. I asked him about his rig, and he told me that it was a one-tube transmitter made with a 6L6. I forgot to ask him where he got the schematic, but a quick Internet search turned up the following:. Apparently, it was used quite a bit in public address systems. After the tube became successful, tube manufacturers introduced a number of variations, including the venerable
The following examples of oscillator, amplifier and complete transmitter construction have been selected to illustrate different types of mechanical arrangement and representative methods of circuit design. The amateur who does not wish to duplicate a particular transmitter or unit undoubtedly will find many ideas which will be of value to him in planning a layout to fit his individual needs. Many of the units, particularly those designed for relay-rack mounting, will be found to match well so that two or more can be assembled into a complete transmitter. When single amplifier units are described, the excitation power requirements are given, so that it is a simple matter to select a lower-power unit capable of delivering the required output to use for driving purposes. In examining the apparatus described in this chapter, the reader should keep in mind the fact that the brand name and type numbers of the parts.
I also like operating vintage AM tube gear as well. This Novice rig from the 50s works fine, but it does leave something to be desired in the modulation department. I also noticed some nonlinearity in the RF envelope. This prompted me to take the plunge into home-brewing. I had to start with the basics of how vacuum tubes work.