"Tio Pedro" wrote in message
...
The speaker FC must have been a weak link. Mine also had
a replacement speaker installed.
You could be right, the S-20R seems to be one of the
last receivers Hallicrafters made using a field coil
speaker. They were common in the 1930's and 1940's because
good permanent magnet materials were just becoming available
and were somewhat expensive and it was an economy to use the
field coil as a smoothing choke.
I am curious about the mounting method originally used.
The advertising states that the speaker was "shock mounted"
probably to avoid microphonics, but, since the original
mounting is gone, I have no idea of how this was done.
Perhaps someone with an intact S-20R or S-22 could have a
look.
Another curiousity: The bottom cover has a series of
holes for access to the adjustments. Around this are four
small holes. It does not appear that anything was ever
screwed to these. I wonder if there was once a cover over
the holes or if, perhaps, there was just nothing ever there.
Another curiousity, I seem to be full of them: On H
receivers the band spread is normally set at zero. On this
RX it will go to about 95 but not all the way to 100, is
this normal for this thing?


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Richard Knoppow
Los Angeles, CA, USA