1950s Battery Valve Portables - Misconceptions?

[Robert Darwent]

Typically in those using a DF97, the VHF tuner head circuit broadly follows thosed based around an ECC85 or UCC85 found in many common 50s mains only table sets, but in miniature of course.

... well, as far as the mixer is concerned. yes. But there's no front-end RF amplifier/buffer - the aerial is connected directly to the mixer (at a cunningly chosen oscillator null point, so that there's no oscillator radiation from the aerial).

...well, you are obviously referring to a specific model. My comments were generalised, it was the very reason I chose the words 'broadly follows'. There must have been several dozen VHF valve portables produced during the 1950s, your statement does not apply to all of them.

Regards