Total posts : 45366
Ken Cornell, W2IMB, wrote a series of books for
Radio Experimenters about Part 15 on the AM BCB
and the LW Part 15 band. He is no longer with us
and the books are out of print.
There were ten editions of the book (I think) that he
sold from the early 1970s to the late 1980s (?).
Ken had some tube transmitter designs that used the
6V6 as a final. He noted that the 6V6 ran very efficiently
using 20 volts on the plate. (I’m not sure what that really
meant – I suppose it just referred to the efficiency of the
tube.) The rig ran 100 mW into the final amp. The antenna
was 10 feet. (I think the rule was different in those days –
it was ten feet, and not 3 meters.)
Although the transmitters used modulation transformers and
could run AM, Ken and anther experimenter 11 miles away
made successful contacts on cw. Because Part 15 above 1600
kHz was not legal in those days, they had to go below 1600 kHz.
The frequencies in use were 1575, 1585, and 1595 kHz. And
again, they were successful over an 11 mile path.
Although I have some of Ken’s circuits on paper at home, I do not
have the tube designs. However, I have always been intrigued by
that 6V6 final, and how well he said it worked.
Is this relevant to what you guys are talking about? I’m not sure.
Bruce, DOGRADIO Studio 2