Fortunately, the development of TV tuners over the period at interest (from the later 1940s and into the 1970s) has been fairly well covered in the literature. The following articles, which I found mostly by now-and-again casual searching, are all from magazines and journals available at the very excellent
http://www.americanradiohistory.com/ site.
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RC 194711 p.32ff FM and Television Design Part I – Tubes and Circuits Used in High- Frequency R.F. Amplifiers
RC 194712 p.32ff FM and Television Design Part II – Special Circuits and Tuning Equipment Used for Very High Frequencies
RCA-R 194803 p,136ff Radio-Frequency Performance of Some Receiving Tubes in Television Circuits
TT 194901 p.36ff A Front End for Television Receivers (GE Two-Tube with 12AT7)
FM-TV 195003 p.09ff Continuous Tuning for TV Sets (Dumont)
TVE 195005 p.19 The Printed Circuit TV Tuner
PTV 195012 p.295ff Tuner Unit for Television (RCA Turret)
RCA-R 195103 p.03ff Use of New Low-Noise Twin triode in Television Tuners (6BQ7)
FM-TV 195105 p.12ff Zenith VHF-UHF Tuner
TT 195105 p.54ff Two-Tube Television Tuner Design Part 1 (Magnavox)
TT 195106 p.54ff Two-Tube Television Tuner Design Part 2 (Magnavox)
TT 195108 p.30 TV Receiver Manufacturers Ready with UHF Conversion Devices
E 195212 p.118ff Stable Oscillator for UHF TV Receivers (RCA 6AF4)
E 195212 p.134ff One-Channel Converter for UHF Television (RCA)
RE 195301 p.57ff UHF Circuitry
E 195305 p.222 Tubes for UHF Application
RE 195308 p.38ff Cascode Type Front Ends Part 1
RE 195309 p.58ff Cascode Type Front Ends Part 2
RCA-R 195309 p.318ff A VHF-UHF Television Turret Tuner
RCA-R 195312 p.461ff A Capacitive-Tuned Ultra-High-Frequency Television Tuner
R&TVN 195504 p.42ff New TV Turret Tuner (Standard Coil New Design)
TT 195504 p.80ff Designing TV Tuners for Color Receivers
WW 195508 p.397ff The Cascode – And Its Advantages for Band III Reception
RE 195601 p.48ff New “Rainbow” Tuner (Standard Coil)
RE 195607 p.30ff The Neutrode- New VHF-UHF Tuner (Standard Coil)
PTV 195803 p.361 Multi-Channel Tuner Installation
R&TVN 195805 p.65ff New TV Front End Designs
PTV 195807 p.598 13-Channel Turret Tuner (ABMP version of the Fireball)
RE 195808 p.43ff New Circuits in TV Tuners
EW 195912 p.106 Tuner for Transistor TV (General Instruments)
RE 196001 p.42ff TV Tuner with a Guided Grid (Standard Coil)
RCA-E 196008,09 p.28ff A Nuvistor Low-Noise VHF Tuner
WW 196010 p.474ff Permeability Tuners for Television (Bush)
RE 196102 p.72 TV Tuner Uses Nuvistor Triode
E 19660321 p.109ff For a Good Mixer, Ass One FET (TI; proposal to use a jfet mixer in UHF tuners)
PFR 196812 p.14ff A Look at RCA’s Solid-State Color Part 1 (RCA KRK-142 Tuner)
ES 197012 p.38ff The All-Electronic Tuner
EI 197009 p.72ff TV Tuning Goes Electronic
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The magazines and journals are:
E Electronics
EI Electronics Illustrated
ES Electronic Servicing (formerly PF Reporter)
EW Electronics World
FM-TV FM-TV Radio Communication
PFR PF Reporter
PTV Practical Television
R&TVN Radio & TV News
RCA-E RCA Engineer
RCA-R RCA Review
RC Radio Craft
RE Radio-Electronics
TT Tele-Tech
TVE Television Engineering
WW Wireless World
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Cheers,