On Thu, 11 Jun 2015 00:31:35 -0700, Robert Baer
wrote:
Michael Black wrote:
[snip]
I'm finding it quite amazing now to read about multiband transistor
portables that were out in the late fifties, I assumed that sort of
thing didn't arrive till the sixties. A lot of those early transistor
shortwave radios were junk, but there was the National HRO-500 in 1964
that's considered an expensive classic.
* AS i vaguely remember, the bandwidth-extending trick (borrowed from
tube circuits) of neutralization was used.
Michael
[snip]
Yep. In the late '50's I had an AM radio that used CK760's in the IF.
The IF transformers had an extra winding feeding back thru a capacitor
to the transistor base to "neutralize".
...Jim Thompson
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