By the golden age all the speakers had learnt that
Improvisation is forbidded, the written text must be read!
Although only a few knew Skoff Elza and Filotás Lili
All the listeners knew how nice their voice is
The golden age of radio begin in the '30s on the Hungary. I assume it was expected from the anchors to tell the news how they got it on paper. Radio ain't free.
Skoff Elza and Filotás Lili were both presenters the latter a decade earlier from 1931 (at the age 23). Both knew languages - German, French, English typically complemented by some others.

The kids were searching the "uncle" in the box
And the grandmas polished it with wax
The mailmen took from the listeners the tax
Who had to pay the same both for the good and bad news
Note: the "uncle" is a generic term for older men, the kids thought someone is in the box of the radio. Since the box was made of wood and not plastic back then it needed some care, as with all furniture, so they polished them with wax. The tax in this context is the subscription fee, I assume it was kinda like the telly loicense for the Bri'ish. And ofc it was the same amount no matter what was the news.

I skip a verse here because it's just a "radio simulation".

Today we receive it in stereo, and it's good
For one can hear different things from the two sides
The beauty in the sound of the grand orchestra
That you sit in the middle and you listen well, the picture is more clear
Note: it's a not so technical explanation of the stereo sound, since it gives a different perspective, a more natural sounding.

Sometimes it interferes with us, and sometimes machines interfere with them
We put them in our pockets, and if you don't pay mind it will pocket you
In clear weather all broadcasts received clearly
And in the programs the old song can be heard anew
Note: first two lines are word plays I tried to translate doesn't matter, first line is based on the interference ofc.