RadioBanter - View Single Post - Channel-based AM tube tuner (was Designs for a single frequency high performance AM-MW receiver?)

June 14th 04, 01:44 AM

In article , wrote:

Steven Swift wrote:

Hi Fi AM--

This was "almost" popular as a design project in the 60s. Even RCA in
their RC-19 Tube Manual have a circuit labelled "TRF AM Tuner-- for High-
Fidelity Local Broadcast Reception." (Circuit 19-8, p. 357)

John Byrns web site has the circuit diagram for the RCA design you
mention (or a related one if there's more than one of them):

The circuit is the same, with one exception, in all the editions of the
RCA tube manual in which it was contained. The one change that occurred
in later editions was a change from a 5Y3GT rectifier in the power supply,
to a rectifier with an indirectly heated cathode, I think it was a 6X4.
This circuit was only published during the 1950's, it did not appear in
editions before about 1950, and was dropped from later editions after
about 1960. I have often wondered if it was inspired by Williamson's late
1940's design for a radio feeder unit.

Regards,

John Byrns

Surf my web pages at, http://users.rcn.com/jbyrns/