"Henry Kolesnik" wrote in message om...
Michael
Amen brother but you have to give Jon credit for his pursuit as he will
learn much and he'll be able to tell us why Marantz or McIntosh didn't make
a High Quality TRF tuner. Or maybe we'll all be drooling over the Noring
High Quality TRF tuner. Or maybe he'll morf from Noring to Notrf!
--
73
Hank WD5JFR

"Michael Black" wrote in message
om...
Jon Noring wrote in message
. ..
In Patrick Turner's latest message replying to the thread I started on
building a high-performance AM tube tuner, he stated his skepticism
that a pure TRF circuit will, in a practical sense, meet the specs I'm
looking for (to meet the specs will require an impractical number of
RF amplifier stages, such as six or more.)

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I recall reading about a trf radio that was used in German submarines
in WWII
I think it was in an old QST or 73 about 15 years ago. It was
sensitive and
well shielded and of incredible quality. Perhaps one is available on
the surplus market, or at least the schematic. As I recall, it had a
four-gang tuning condenser. It was a trf design to eliminate any
oscillator radiation that could be picked up by sub-hunters. The trf
radio was in an article describing German radios of WWII.