April 5th 10, 04:18 AM
posted to rec.radio.shortwave
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First recorded activity by RadioBanter: Jan 2009
Posts: 5,185
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50,000 Watts of Tradition: WOWO 1190 AM
The basic innards haven't changed all that much, but the envelope technology
definately has. The tubes they used in the 30's were huge glass bottles (R.
Peking used to have finals that you could go inside of and change the
elements, rather than replace the tubes!). In places where they still use
tubes at all (not very many anymore), the things tend to be much smaller
ceramic types. By far the most popular technology for AM broadcast is now
modular banks of high power MOSfets.
http://hawkins.pair.com/rci1.shtml
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